This document is obsolete. Please
refer to RFC 3895.
Network Working Group D. Fowler, Editor Request for Comments: 2495 Newbridge Networks Obsoletes: 1406 January 1999 Category: Standards Track
Definitions of Managed Objects for the DS1, E1, DS2 and E2 Interface Types
Status of this Memo
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (1999). All Rights Reserved.
Abstract
This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes objects used for managing DS1, E1, DS2 and E2 interfaces. This document is a companion document with Definitions of Managed Objects for the DS0 (RFC 2494 [30]), DS3/E3 (RFC 2496 [28]), and the work in progress, SONET/SDH Interface Types.
This memo specifies a MIB module in a manner that is both compliant to the SNMPv2 SMI, and semantically identical to the peer SNMPv1 definitions.
Table of Contents
1 The SNMP Management Framework ................................ 2 1.1 Changes from RFC1406 ....................................... 3 2 Overview ..................................................... 4 2.1 Use of ifTable for DS1 Layer ............................... 5 2.2 Usage Guidelines ........................................... 6 2.2.1 Usage of ifStackTable for Routers and DSUs ............... 6 2.2.2 Usage of ifStackTable for DS1/E1 on DS2/E2 ............... 8 2.2.3 Usage of Channelization for DS3, DS1, DS0 ................ 9 2.2.4 Usage of Channelization for DS3, DS2, DS1 ................ 9 2.2.5 Usage of Loopbacks ....................................... 10 2.3 Objectives of this MIB Module .............................. 11 2.4 DS1 Terminology ............................................ 11
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
2.4.1 Error Events ............................................. 12 2.4.2 Performance Defects ...................................... 12 2.4.3 Performance Parameters ................................... 14 2.4.4 Failure States ........................................... 17 2.4.5 Other Terms .............................................. 21 3 Object Definitions ........................................... 21 3.1 The DS1 Near End Group ..................................... 22 3.1.1 The DS1 Configuration Table .............................. 22 3.1.2 The DS1 Current Table .................................... 33 3.1.3 The DS1 Interval Table ................................... 36 3.1.4 The DS1 Total Table ...................................... 39 3.1.5 The DS1 Channel Table .................................... 42 3.2 The DS1 Far End Group ...................................... 43 3.2.1 The DS1 Far End Current Table ............................ 43 3.2.2 The DS1 Far End Interval Table ........................... 47 3.2.3 The DS1 Far End Total Table .............................. 50 3.3 The DS1 Fractional Table ................................... 53 3.4 The DS1 Trap Group ......................................... 55 3.5 Conformance Groups ......................................... 61 4 Appendix A - Use of dsx1IfIndex and dsx1LineIndex ............ 66 5 Appendix B - The delay approach to Unavialable Seconds. ..... 69 6 Intellectual Property ........................................ 70 7 Acknowledgments .............................................. 70 8 References ................................................... 71 9 Security Considerations ...................................... 73 10 Author's Address ............................................ 74 11 Full Copyright Statement .................................... 75
The SNMP Management Framework presently consists of five major components:
o An overall architecture, described in RFC 2271 [1].
o Mechanisms for describing and naming objects and events for the purpose of management. The first version of this Structure of Management Information (SMI) is called SMIv1 and described in STD 16, RFC 1155 [2], STD 16, RFC 1212 [3] and RFC 1215 [4]. The second version, called SMIv2, is described in RFC 1902 [5], RFC 1903 [6] and RFC 1904 [7].
o Message protocols for transferring management information. The first version of the SNMP message protocol is called SNMPv1 and described in STD 15, RFC 1157 [8]. A second version of the SNMP message protocol, which is not an Internet standards track protocol, is called SNMPv2c and described in RFC 1901 [9] and RFC 1906 [10]. The third version of the message protocol is
o Protocol operations for accessing management information. The first set of protocol operations and associated PDU formats is described in STD 15, RFC 1157 [8]. A second set of protocol operations and associated PDU formats is described in RFC 1905 [13].
o A set of fundamental applications described in RFC 2273 [14] and the view-based access control mechanism described in RFC 2275 [15]. Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the mechanisms defined in the SMI. This memo specifies a MIB module that is compliant to the SMIv2. A MIB conforming to the SMIv1 can be produced through the appropriate translations. The resulting translated MIB must be semantically equivalent, except where objects or events are omitted because no translation is possible (use of Counter64). Some machine readable information in SMIv2 will be converted into textual descriptions in SMIv1 during the translation process. However, this loss of machine readable information is not considered to change the semantics of the MIB.
(7) Additional lineTypes for DS2, E2, and unframed E1 were added.
(8) The definition of valid intervals has been clarified for the case where the agent proxied for other devices. In particular, the treatment of missing intervals has been clarified.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
(9) An inward loopback has been added.
(10) Additional lineStatus bits have been added for Near End in Unavailable Signal State, Carrier Equipment Out of Service, DS2 Payload AIS, and DS2 Performance Threshold.
(11) A read-write line Length object has been added.
(12) Signal mode of other has been added.
(13) Added a lineStatus last change, trap and enabler.
(14) The e1(19) ifType has been obsoleted so this MIB does not list it as a supported ifType.
(15) Textual Conventions for statistics objects have been used.
(16) A new object, dsx1LoopbackStatus has been introduced to reflect the loopbacks established on a DS1 interface and the source to the requests. dsx1LoopbackConfig continues to be the desired loopback state while dsx1LoopbackStatus reflects the actual state.
(17) A dual loopback has been added to allow the setting of an inward loopback and a line loopback at the same time.
(18) An object indicating which channel to use within a parent object (i.e. DS3) has been added.
(19) An object has been added to indicate whether or not this DS1/E1 is channelized.
(20) Line coding type of B6ZS has been added for DS2
These objects are used when the particular media being used to realize an interface is a DS1/E1/DS2/E2 interface. At present, this applies to these values of the ifType variable in the Internet- standard MIB:
ds1 (18)
The definitions contained herein are based on the AT&T T-1 Superframe (a.k.a., D4) and Extended Superframe (ESF) formats [17, 18], the latter of which conforms to ANSI specifications [19], and the CCITT Recommendations [20, 21], referred to as E1 for the rest of this memo.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
The various DS1 and E1 line disciplines are similar enough that separate MIBs are unwarranted, although there are some differences. For example, Loss of Frame is defined more rigorously in the ESF specification than in the D4 specification, but it is defined in both. Therefore, interface types e1(19) and g703at2mb(67) have been obsoleted.
Where it is necessary to distinguish between the flavors of E1 with and without CRC, E1-CRC denotes the "with CRC" form (G.704 Table 4b) and E1-noCRC denotes the "without CRC" form (G.704 Table 4a).
ifTable Object Use for DS1 Layer ====================================================================== ifIndex Interface index.
ifDescr See interfaces MIB [16]
ifType ds1(18)
ifSpeed Speed of line rate DS1 - 1544000 E1 - 2048000 DS2 - 6312000 E2 - 8448000
ifPhysAddress The value of the Circuit Identifier. If no Circuit Identifier has been assigned this object should have an octet string with zero length.
ifAdminStatus See interfaces MIB [16]
ifOperStatus See interfaces MIB [16]
ifLastChange See interfaces MIB [16]
ifName See interfaces MIB [16].
ifLinkUpDownTrapEnable Set to enabled(1).
ifHighSpeed Speed of line in Mega-bits per second (2, 6, or 8)
ifConnectorPresent Set to true(1) normally, except for
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
cases such as DS1/E1 over AAL1/ATM where false(2) is appropriate
The object dsx1IfIndex has been deprecated. This object previously allowed a very special proxy situation to exist for Routers and CSUs. This section now describes how to use ifStackTable to represent this relationship.
The paragraphs discussing dsx1IfIndex and dsx1LineIndex have been preserved in Appendix A for informational purposes.
The ifStackTable is used in the proxy case to represent the association between pairs of interfaces, e.g. this T1 is attached to that T1. This use is consistent with the use of the ifStackTable to show the association between various sub-layers of an interface. In both cases entire PDUs are exchanged between the interface pairs - in the case of a T1, entire T1 frames are exchanged; in the case of PPP and HDLC, entire HDLC frames are exchanged. This usage is not meant to suggest the use of the ifStackTable to represent Time Division Multiplexing (TDM) connections in general.
External&Internal interface scenario: the SNMP Agent resides on a host external from the device supporting DS1 interfaces (e.g., a router). The Agent represents both the host and the DS1 device.
Example:
A shelf full of CSUs connected to a Router. An SNMP Agent residing on the router proxies for itself and the CSU. The router has also an Ethernet interface:
If the CSU shelf is managed by itself by a local SNMP Agent, the situation would be identical, except the Ethernet and the 4 router interfaces are deleted. Interfaces would also be numbered from 1 to 8.
An example is given of how DS1/E2 interfaces are stacked on DS2/E2 interfaces. It is not necessary nor is it always desirable to represent DS2 interfaces. If this is required, the following stacking should be used. All ifTypes are ds1. The DS2 is determined by examining ifSpeed or dsx1LineType.
An example is given here to explain the channelization objects in the DS3, DS1, and DS0 MIBs to help the implementor use the objects correctly. Treatment of E3 and E1 would be similar, with the number of DS0s being different depending on the framing of the E1.
Assume that a DS3 (with ifIndex 1) is Channelized into DS1s (without DS2s). The object dsx3Channelization is set to enabledDs1. There will be 28 DS1s in the ifTable. Assume the entries in the ifTable for the DS1s are created in channel order and the ifIndex values are 2 through 29. In the DS1 MIB, there will be an entry in the dsx1ChanMappingTable for each ds1. The entries will be as follows:
In addition, the DS1s are channelized into DS0s. The object dsx1Channelization is set to enabledDS0 for each DS1. When this object is set to this value, 24 DS0s are created by the agent. There will be 24 DS0s in the ifTable for each DS1. If the dsx1Channelization is set to disabled, the 24 DS0s are destroyed.
Assume the entries in the ifTable are created in channel order and the ifIndex values for the DS0s in the first DS1 are 30 through 53. In the DS0 MIB, there will be an entry in the dsx0ChanMappingTable for each DS0. The entries will be as follows:
An example is given here to explain the channelization objects in the DS3 and DS1 MIBs to help the implementor use the objects correctly.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Assume that a DS3 (with ifIndex 1) is Channelized into DS2s. The object dsx3Channelization is set to enabledDs2. There will be 7 DS2s (ifType of DS1) in the ifTable. Assume the entries in the ifTable for the DS2s are created in channel order and the ifIndex values are 2 through 8. In the DS1 MIB, there will be an entry in the dsx1ChanMappingTable for each DS2. The entries will be as follows:
In addition, the DS2s are channelized into DS1s. The object dsx1Channelization is set to enabledDS1 for each DS2. There will be 4 DS1s in the ifTable for each DS2. Assume the entries in the ifTable are created in channel order and the ifIndex values for the DS1s in the first DS2 are 9 through 12, then 13 through 16 for the second DS2, and so on. In the DS1 MIB, there will be an entry in the dsx1ChanMappingTable for each DS1. The entries will be as follows:
This section discusses the behaviour of objects related to loopbacks.
The object dsx1LoopbackConfig represents the desired state of loopbacks on this interface. Using this object a Manager can request: LineLoopback PayloadLoopback (if ESF framing) InwardLoopback DualLoopback (Line + Inward) NoLoopback
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
The remote end can also request loopbacks either through the FDL channel if ESF or inband if D4. The loopbacks that can be request this way are: LineLoopback PayloadLoopback (if ESF framing) NoLoopback
To model the current state of loopbacks on a DS1 interface, the object dsx1LoopbackStatus defines which loopback is currently applies to an interface. This objects, which is a bitmap, will have bits turned on which reflect the currently active loopbacks on the interface as well as the source of those loopbacks.
The following restrictions/rules apply to loopbacks:
The far end cannot undo loopbacks set by a manager.
A manager can undo loopbacks set by the far end.
Both a line loopback and an inward loopback can be set at the same time. Only these two loopbacks can co-exist and either one may be set by the manager or the far end. A LineLoopback request from the far end is incremental to an existing Inward loopback established by a manager. When a NoLoopback is received from the far end in this case, the InwardLoopback remains in place.
There are numerous things that could be included in a MIB for DS1 signals: the management of multiplexors, CSUs, DSUs, and the like. The intent of this document is to facilitate the common management of all devices with DS1, E1, DS2, or E3 interfaces. As such, a design decision was made up front to very closely align the MIB with the set of objects that can generally be read from these types devices that are currently deployed.
The terminology used in this document to describe error conditions on a DS1 interface as monitored by a DS1 device are based on the late but not final draft of what became the ANSI T1.231 standard [11]. If the definition in this document does not match the definition in the ANSI T1.231 document, the implementer should follow the definition described in this document.
Bipolar Violation (BPV) Error Event A BPV error event for an AMI-coded signal is the occurrence of a pulse of the same polarity as the previous pulse. (See T1.231 Section 6.1.1.1.1) A BPV error event for a B8ZS- or HDB3- coded signal is the occurrence of a pulse of the same polarity as the previous pulse without being a part of the zero substitution code.
Excessive Zeroes (EXZ) Error Event An Excessive Zeroes error event for an AMI-coded signal is the occurrence of more than fifteen contiguous zeroes. (See T1.231 Section 6.1.1.1.2) For a B8ZS coded signal, the defect occurs when more than seven contiguous zeroes are detected.
Line Coding Violation (LCV) Error Event A Line Coding Violation (LCV) is the occurrence of either a Bipolar Violation (BPV) or Excessive Zeroes (EXZ) Error Event. (Also known as CV-L; See T1.231 Section 6.5.1.1)
Path Coding Violation (PCV) Error Event A Path Coding Violation error event is a frame synchronization bit error in the D4 and E1-noCRC formats, or a CRC or frame synch. bit error in the ESF and E1-CRC formats. (Also known as CV-P; See T1.231 Section 6.5.2.1)
Controlled Slip (CS) Error Event A Controlled Slip is the replication or deletion of the payload bits of a DS1 frame. (See T1.231 Section 6.1.1.2.3) A Controlled Slip may be performed when there is a difference between the timing of a synchronous receiving terminal and the received signal. A Controlled Slip does not cause an Out of Frame defect.
Out Of Frame (OOF) Defect An OOF defect is the occurrence of a particular density of Framing Error events. (See T1.231 Section 6.1.2.2.1)
For DS1 links, an Out of Frame defect is declared when the receiver detects two or more framing errors within a 3 msec period for ESF signals and 0.75 msec for D4 signals, or two or more errors out of five or fewer consecutive framing-bits.
For E1 links, an Out Of Frame defect is declared when three consecutive frame alignment signals have been received with an error (see G.706 Section 4.1 [26]).
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
For DS2 links, an Out of Frame defect is declared when 7 or more consecutive errored framing patterns (4 multiframe) are received. The LOF is cleared when 3 or more consecutive correct framing patterns are received.
Once an Out Of Frame Defect is declared, the framer starts searching for a correct framing pattern. The Out of Frame defect ends when the signal is in frame.
In-frame occurs when there are fewer than two frame bit errors within 3 msec period for ESF signals and 0.75 msec for D4 signals.
For E1 links, in-frame occurs when a) in frame N the frame alignment signal is correct and b) in frame N+1 the frame alignment signal is absent (i.e., bit 2 in TS0 is a one) and c) in frame N+2 the frame alignment signal is present and correct. (See G.704 Section 4.1)
Alarm Indication Signal (AIS) Defect For D4 and ESF links, the 'all ones' condition is detected at a DS1 line interface upon observing an unframed signal with a one's density of at least 99.9% present for a time equal to or greater than T, where 3 ms <= T <= 75 ms. The AIS is terminated upon observing a signal not meeting the one's density or the unframed signal criteria for a period equal to or greater than than T. (See G.775, Section 5.4)
For E1 links, the 'all-ones' condition is detected at the line interface as a string of 512 bits containing fewer than three zero bits (see O.162 [23] Section 3.3.2).
For DS2 links, the DS2 AIS shall be sent from the NT1 to the user to indicate a loss of the 6,312 kbps frame capability on the network side. The DS2 AIS is defined as a bit array of 6,312 kbps in which all binary bits are set to '1'.
The DS2 AIS detection and removal shall be implemented according to ITU-T Draft Recommendation G.775 [31] Section 5.5: - a DS2 AIS defect is detected when the incoming signal has two (2) or less ZEROs in a sequence of 3156 bits (0.5 ms). - a DS2 AIS defect is cleared when the incoming signal has three (3) or more ZEROs in a sequence of 3156 bits (0.5 ms).
All performance parameters are accumulated in fifteen minute intervals and up to 96 intervals (24 hours worth) are kept by an agent. Fewer than 96 intervals of data whelfill be available if the agent has been restarted within the last 24 hours. In addition, there is a rolling 24-hour total of each performance parameter. Performance parameters continue to be collected when the interface is down.
There is no requirement for an agent to ensure fixed relationship between the start of a fifteen minute interval and any wall clock; however some agents may align the fifteen minute intervals with quarter hours.
Performance parameters are of types PerfCurrentCount, PerfIntervalCount and PerfTotalCount. These textual conventions are all Gauge32, and they are used because it is possible for these objects to decrease. Objects may decrease when Unavailable Seconds occurs across a fifteen minutes interval boundary. See Unavailable Seconds discussion later in this section.
Line Errored Seconds (LES) A Line Errored Second is a second in which one or more Line Code Violation error events were detected. (Also known as ES-L; See T1.231 Section 6.5.1.2)
Controlled Slip Seconds (CSS) A Controlled Slip Second is a one-second interval containing one or more controlled slips. (See T1.231 Section 6.5.2.8) This is not incremented during an Unavailable Second.
Errored Seconds (ES) For ESF and E1-CRC links an Errored Second is a second with one or more Path Code Violation OR one or more Out of Frame defects OR one or more Controlled Slip events OR a detected AIS defect. (See T1.231 Section 6.5.2.2 and G.826 [32] Section B.1)
For D4 and E1-noCRC links, the presence of Bipolar Violations also triggers an Errored Second.
This is not incremented during an Unavailable Second.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Bursty Errored Seconds (BES) A Bursty Errored Second (also known as Errored Second type B in T1.231 Section 6.5.2.4) is a second with fewer than 320 and more than 1 Path Coding Violation error events, no Severely Errored Frame defects and no detected incoming AIS defects. Controlled slips are not included in this parameter.
This is not incremented during an Unavailable Second. It applies to ESF signals only.
Severely Errored Seconds (SES) A Severely Errored Second for ESF signals is a second with 320 or more Path Code Violation Error Events OR one or more Out of Frame defects OR a detected AIS defect. (See T1.231 Section 6.5.2.5)
For E1-CRC signals, a Severely Errored Second is a second with 832 or more Path Code Violation error events OR one or more Out of Frame defects.
For E1-noCRC signals, a Severely Errored Second is a 2048 LCVs or more.
For D4 signals, a Severely Errored Second is a count of one- second intervals with Framing Error events, or an OOF defect, or 1544 LCVs or more.
Controlled slips are not included in this parameter.
This is not incremented during an Unavailable Second.
Severely Errored Framing Second (SEFS) An Severely Errored Framing Second is a second with one or more Out of Frame defects OR a detected AIS defect. (Also known as SAS-P (SEF/AIS second); See T1.231 Section 6.5.2.6)
Degraded Minutes A Degraded Minute is one in which the estimated error rate exceeds 1E-6 but does not exceed 1E-3 (see G.821 [24]).
Degraded Minutes are determined by collecting all of the Available Seconds, removing any Severely Errored Seconds grouping the result in 60-second long groups and counting a 60- second long group (a.k.a., minute) as degraded if the cumulative errors during the seconds present in the group exceed 1E-6. Available seconds are merely those seconds which are not Unavailable as described below.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Unavailable Seconds (UAS) Unavailable Seconds (UAS) are calculated by counting the number of seconds that the interface is unavailable. The DS1 interface is said to be unavailable from the onset of 10 contiguous SESs, or the onset of the condition leading to a failure (see Failure States). If the condition leading to the failure was immediately preceded by one or more contiguous SESs, then the DS1 interface unavailability starts from the onset of these SESs. Once unavailable, and if no failure is present, the DS1 interface becomes available at the onset of 10 contiguous seconds with no SESs. Once unavailable, and if a failure is present, the DS1 interface becomes available at the onset of 10 contiguous seconds with no SESs, if the failure clearing time is less than or equal to 10 seconds. If the failure clearing time is more than 10 seconds, the DS1 interface becomes available at the onset of 10 contiguous seconds with no SESs, or the onset period leading to the successful clearing condition, whichever occurs later. With respect to the DS1 error counts, all counters are incremented while the DS1 interface is deemed available. While the interface is deemed unavailable, the only count that is incremented is UASs.
Note that this definition implies that the agent cannot determine until after a ten second interval has passed whether a given one-second interval belongs to available or unavailable time. If the agent chooses to update the various performance statistics in real time then it must be prepared to retroactively reduce the ES, BES, SES, and SEFS counts by 10 and increase the UAS count by 10 when it determines that available time has been entered. It must also be prepared to adjust the PCV count and the DM count as necessary since these parameters are not accumulated during unavailable time. It must be similarly prepared to retroactively decrease the UAS count by 10 and increase the ES, BES, and DM counts as necessary upon entering available time. A special case exists when the 10 second period leading to available or unavailable time crosses a 900 second statistics window boundary, as the foregoing description implies that the ES, BES, SES, SEFS, DM, and UAS counts the PREVIOUS interval must be adjusted. In this case successive GETs of the affected dsx1IntervalSESs and dsx1IntervalUASs objects will return differing values if the first GET occurs during the first few seconds of the window.
The agent may instead choose to delay updates to the various statistics by 10 seconds in order to avoid retroactive adjustments to the counters. A way to do this is sketched in Appendix B.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
In any case, a linkDown trap shall be sent only after the agent has determined for certain that the unavailable state has been entered, but the time on the trap will be that of the first UAS (i.e., 10 seconds earlier). A linkUp trap shall be handled similarly.
According to ANSI T1.231 unavailable time begins at the _onset_ of 10 contiguous severely errored seconds -- that is, unavailable time starts with the _first_ of the 10 contiguous SESs. Also, while an interface is deemed unavailable all counters for that interface are frozen except for the UAS count. It follows that an implementation which strictly complies with this standard must _not_ increment any counters other than the UAS count -- even temporarily -- as a result of anything that happens during those 10 seconds. Since changes in the signal state lag the data to which they apply by 10 seconds, an ANSI- compliant implementation must pass the the one-second statistics through a 10-second delay line prior to updating any counters. That can be done by performing the following steps at the end of each one second interval.
i) Read near/far end CV counter and alarm status flags from the hardware.
ii) Accumulate the CV counts for the preceding second and compare them to the ES and SES threshold for the layer in question. Update the signal state and shift the one-second CV counts and ES/SES flags into the 10-element delay line. Note that far-end one-second statistics are to be flagged as "absent" during any second in which there is an incoming defect at the layer in question or at any lower layer.
iii) Update the current interval statistics using the signal state from the _previous_ update cycle and the one-second CV counts and ES/SES flags shifted out of the 10-element delay line.
The following failure states are received, or detected failures, that are reported in the dsx1LineStatus object. When a DS1 interface would, if ever, produce the conditions leading to the failure state is described in the appropriate specification.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Far End Alarm Failure The Far End Alarm failure is also known as "Yellow Alarm" in the DS1 case, "Distant Alarm" in the E1 case, and "Remote Alarm" in the DS2 case.
For D4 links, the Far End Alarm failure is declared when bit 6 of all channels has been zero for at least 335 ms and is cleared when bit 6 of at least one channel is non-zero for a period T, where T is usually less than one second and always less than 5 seconds. The Far End Alarm failure is not declared for D4 links when a Loss of Signal is detected.
For ESF links, the Far End Alarm failure is declared if the Yellow Alarm signal pattern occurs in at least seven out of ten contiguous 16-bit pattern intervals and is cleared if the Yellow Alarm signal pattern does not occur in ten contiguous 16-bit signal pattern intervals.
For E1 links, the Far End Alarm failure is declared when bit 3 of time-slot zero is received set to one on two consecutive occasions. The Far End Alarm failure is cleared when bit 3 of time-slot zero is received set to zero.
For DS2 links, if a loss of frame alignment (LOF or LOS) and/or DS2 AIS condition, is detected, the RAI signal shall be generated and transmitted to the remote side.
The Remote Alarm Indication(RAI) signal is defined on m-bits as a repetition of the 16bit sequence consisting of eight binary '1s' and eight binary '0s' in m-bits(1111111100000000). When the RAI signal is not sent (in normal operation),the HDLC flag pattern (01111110) in the m-bit is sent.
The RAI failure is detected when 16 or more consecutive RAI- patterns (1111111100000000) are received. The RAI failure is cleared when 4 or more consecutive incorrect-RAI-patterns are received.
Alarm Indication Signal (AIS) Failure The Alarm Indication Signal failure is declared when an AIS defect is detected at the input and the AIS defect still exists after the Loss Of Frame failure (which is caused by the unframed nature of the 'all-ones' signal) is declared. The AIS failure is cleared when the Loss Of Frame failure is cleared. (See T1.231 Section 6.2.1.2.1)
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
An AIS defect at a 6312 kbit/s (G.704) interface is detected when the incoming signal has two {2} or less ZEROs in a sequence of 3156 bits (0.5ms).
The AIS signal defect is cleared when the incoming signal has three {3} or more ZEROs in a sequence of 3156 bits (0.5ms).
Loss Of Frame Failure For DS1 links, the Loss Of Frame failure is declared when an OOF or LOS defect has persisted for T seconds, where 2 <= T <= 10. The Loss Of Frame failure is cleared when there have been no OOF or LOS defects during a period T where 0 <= T <= 20. Many systems will perform "hit integration" within the period T before declaring or clearing the failure e.g., see TR 62411 [25].
For E1 links, the Loss Of Frame Failure is declared when an OOF defect is detected.
Loss Of Signal Failure For DS1, the Loss Of Signal failure is declared upon observing 175 +/- 75 contiguous pulse positions with no pulses of either positive or negative polarity. The LOS failure is cleared upon observing an average pulse density of at least 12.5% over a period of 175 +/- 75 contiguous pulse positions starting with the receipt of a pulse.
For E1 links, the Loss Of Signal failure is declared when greater than 10 consecutive zeroes are detected (see O.162 Section 3.4`<.4).
A LOS defect at 6312kbit/s interfaces is detected when the incoming signal has "no transitions", i.e. when the signal level is less than or equal to a signal level of 35dB below nominal, for N consecutive pulse intervals, where 10 <=N<=255.
The LOS defect is cleared when the incoming signal has "transitions", i.e. when the signal level is greater than or equal to a signal level of 9dB below nominal, for N consecutive pulse intervals, where 10<=N<=255.
A signal with "transitions" corresponds to a G.703 compliant signal.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
Loopback Pseudo-Failure The Loopback Pseudo-Failure is declared when the near end equipment has placed a loopback (of any kind) on the DS1. This allows a management entity to determine from one object whether the DS1 can be considered to be in service or not (from the point of view of the near end equipment).
TS16 Alarm Indication Signal Failure For E1 links, the TS16 Alarm Indication Signal failure is declared when time-slot 16 is received as all ones for all frames of two consecutive multiframes (see G.732 Section 4.2.6). This condition is never declared for DS1.
Loss Of MultiFrame Failure The Loss Of MultiFrame failure is declared when two consecutive multiframe alignment signals (bits 4 through 7 of TS16 of frame 0) have been received with an error. The Loss Of Multiframe failure is cleared when the first correct multiframe alignment signal is received. The Loss Of Multiframe failure can only be declared for E1 links operating with G.732 [27] framing (sometimes called "Channel Associated Signalling" mode).
Far End Loss Of Multiframe Failure The Far End Loss Of Multiframe failure is declared when bit 2 of TS16 of frame 0 is received set to one on two consecutive occasions. The Far End Loss Of Multiframe failure is cleared when bit 2 of TS16 of frame 0 is received set to zero. The Far End Loss Of Multiframe failure can only be declared for E1 links operating in "Channel Associated Signalling" mode. (See G.732)
DS2 Payload AIS Failure The DS2 Payload AIS is detected when the incoming signal of the 6,312 kbps frame payload [TS1-TS96] has 2 or less 0's in a sequence of 3072 bits (0.5ms). The DS2 Payload AIS is cleared when the incoming signal of the 6,312 kbps frame payload [TS1- TS96] has 3 or more 0's in a sequence of 3072 bits (0.5 ms).
DS2 Performance Threshold DS2 Performance Threshold Failure monitors equipment performance and is based on the CRC (Cyclic Redundancy Check) Procedure defined in G.704.
The DS2 Performance Threshold Failure is detected when the bit error ratio exceeds 10^-4 (Performance Threshold), and the DS2 Performance Threshold Failure shall be cleared when the bit error ratio decreased to less than 10^-6."
Circuit Identifier This is a character string specified by the circuit vendor, and is useful when communicating with the vendor during the troubleshooting process.
Proxy In this document, the word proxy is meant to indicate an application which receives SNMP messages and replies to them on behalf of the devices which implement the actual DS3/E3 interfaces. The proxy may have already collected the information about the DS3/E3 interfaces into its local database and may not necessarily forward the requests to the actual DS3/E3 interface. It is expected in such an application that there are periods of time where the proxy is not communicating with the DS3/E3 interfaces. In these instances the proxy will not necessarily have up-to-date configuration information and will most likely have missed the collection of some statistics data. Missed statistics data collection will result in invalid data in the interval table.
E-mail: davef@newbridge.com" DESCRIPTION "The MIB module to describe DS1, E1, DS2, and E2 interfaces objects."
::= { transmission 18 }
-- note that this subsumes cept (19) and g703at2mb (67) -- there is no separate CEPT or G703AT2MB MIB
-- The DS1 Near End Group
-- The DS1 Near End Group consists of five tables: -- DS1 Configuration -- DS1 Current -- DS1 Interval -- DS1 Total -- DS1 Channel Table
-- The DS1 Configuration Table
dsx1ConfigTable OBJECT-TYPE SYNTAX SEQUENCE OF Dsx1ConfigEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The DS1 Configuration table." ::= { ds1 6 }
dsx1ConfigEntry OBJECT-TYPE SYNTAX Dsx1ConfigEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the DS1 Configuration table." INDEX { dsx1LineIndex } ::= { dsx1ConfigTable 1 }
dsx1LineIndex OBJECT-TYPE SYNTAX InterfaceIndex MAX-ACCESS read-only STATUS current DESCRIPTION "This object should be made equal to ifIndex. The next paragraph describes its previous usage. Making the object equal to ifIndex allows proper use of ifStackTable and ds0/ds0bundle mibs.
Previously, this object is the identifier of a DS1 Interface on a managed device. If there is an ifEntry that is directly associated with this and only this DS1 interface, it should have the same value as ifIndex. Otherwise, number the dsx1LineIndices with an unique identifier following the rules of choosing a number that is greater than ifNumber and numbering the inside interfaces (e.g., equipment side) with even numbers and outside interfaces (e.g, network side) with odd numbers." ::= { dsx1ConfigEntry 1 }
dsx1IfIndex OBJECT-TYPE SYNTAX InterfaceIndex MAX-ACCESS read-only STATUS deprecated DESCRIPTION "This value for this object is equal to the value of ifIndex from the Interfaces table of MIB II (RFC 1213)." ::= { dsx1ConfigEntry 2 }
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dsx1TimeElapsed OBJECT-TYPE SYNTAX INTEGER (0..899) MAX-ACCESS read-only STATUS current DESCRIPTION "The number of seconds that have elapsed since the beginning of the near end current error- measurement period. If, for some reason, such as an adjustment in the system's time-of-day clock, the current interval exceeds the maximum value, the agent will return the maximum value."
::= { dsx1ConfigEntry 3 }
dsx1ValidIntervals OBJECT-TYPE SYNTAX INTEGER (0..96) MAX-ACCESS read-only STATUS current DESCRIPTION "The number of previous near end intervals for which data was collected. The value will be 96 unless the interface was brought online within the last 24 hours, in which case the value will be the number of complete 15 minute near end intervals since the interface has been online. In the case where the agent is a proxy, it is possible that some intervals are unavailable. In this case, this interval is the maximum interval number for which data is available." ::= { dsx1ConfigEntry 4 }
"This variable indicates the variety of DS1 Line implementing this circuit. The type of circuit affects the number of bits per second that the circuit can reasonably carry, as well as the interpretation of the usage and error statistics. The values, in sequence, describe:
TITLE: SPECIFICATION: dsx1ESF Extended SuperFrame DS1 (T1.107) dsx1D4 AT&T D4 format DS1 (T1.107) dsx1E1 ITU-T Recommendation G.704 (Table 4a) dsx1E1-CRC ITU-T Recommendation G.704 (Table 4b) dsxE1-MF G.704 (Table 4a) with TS16 multiframing enabled dsx1E1-CRC-MF G.704 (Table 4b) with TS16 multiframing enabled dsx1Unframed DS1 with No Framing dsx1E1Unframed E1 with No Framing (G.703) dsx1DS2M12 DS2 frame format (T1.107) dsx1E2 E2 frame format (G.704)
For clarification, the capacity for each E1 type is as listed below: dsx1E1Unframed - E1, no framing = 32 x 64k = 2048k dsx1E1 or dsx1E1CRC - E1, with framing, no signalling = 31 x 64k = 1984k dsx1E1MF or dsx1E1CRCMF - E1, with framing, signalling = 30 x 64k = 1920k
For further information See ITU-T Recomm G.704" ::= { dsx1ConfigEntry 5 }
dsx1LineCoding OBJECT-TYPE SYNTAX INTEGER { dsx1JBZS (1), dsx1B8ZS (2), dsx1HDB3 (3), dsx1ZBTSI (4), dsx1AMI (5), other(6), dsx1B6ZS(7) } MAX-ACCESS read-write STATUS current DESCRIPTION "This variable describes the variety of Zero Code
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Suppression used on this interface, which in turn affects a number of its characteristics.
dsx1JBZS refers the Jammed Bit Zero Suppression, in which the AT&T specification of at least one pulse every 8 bit periods is literally implemented by forcing a pulse in bit 8 of each channel. Thus, only seven bits per channel, or 1.344 Mbps, is available for data.
dsx1B8ZS refers to the use of a specified pattern of normal bits and bipolar violations which are used to replace a sequence of eight zero bits.
ANSI Clear Channels may use dsx1ZBTSI, or Zero Byte Time Slot Interchange.
E1 links, with or without CRC, use dsx1HDB3 or dsx1AMI.
dsx1AMI refers to a mode wherein no zero code suppression is present and the line encoding does not solve the problem directly. In this application, the higher layer must provide data which meets or exceeds the pulse density requirements, such as inverting HDLC data.
dsx1B6ZS refers to the user of a specifed pattern of normal bits and bipolar violations which are used to replace a sequence of six zero bits. Used for DS2."
::= { dsx1ConfigEntry 6 }
dsx1SendCode OBJECT-TYPE SYNTAX INTEGER { dsx1SendNoCode(1), dsx1SendLineCode(2), dsx1SendPayloadCode(3), dsx1SendResetCode(4), dsx1SendQRS(5), dsx1Send511Pattern(6), dsx1Send3in24Pattern(7), dsx1SendOtherTestPattern(8) } MAX-ACCESS read-write STATUS current DESCRIPTION
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"This variable indicates what type of code is being sent across the DS1 interface by the device. Setting this variable causes the interface to send the code requested. The values mean: dsx1SendNoCode sending looped or normal data
dsx1SendLineCode sending a request for a line loopback
dsx1SendPayloadCode sending a request for a payload loopback
dsx1SendResetCode sending a loopback termination request
dsx1SendQRS sending a Quasi-Random Signal (QRS) test pattern
dsx1Send511Pattern sending a 511 bit fixed test pattern
dsx1Send3in24Pattern sending a fixed test pattern of 3 bits set in 24
dsx1SendOtherTestPattern sending a test pattern other than those described by this object" ::= { dsx1ConfigEntry 7 }
dsx1CircuitIdentifier OBJECT-TYPE SYNTAX DisplayString (SIZE (0..255)) MAX-ACCESS read-write STATUS current DESCRIPTION "This variable contains the transmission vendor's circuit identifier, for the purpose of facilitating troubleshooting." ::= { dsx1ConfigEntry 8 }
dsx1InwardLoop(5), dsx1DualLoop(6) } MAX-ACCESS read-write STATUS current DESCRIPTION "This variable represents the desired loopback configuration of the DS1 interface. Agents supporting read/write access should return inconsistentValue in response to a requested loopback state that the interface does not support. The values mean:
dsx1NoLoop Not in the loopback state. A device that is not capable of performing a loopback on the interface shall always return this as its value.
dsx1PayloadLoop The received signal at this interface is looped through the device. Typically the received signal is looped back for retransmission after it has passed through the device's framing function.
dsx1LineLoop The received signal at this interface does not go through the device (minimum penetration) but is looped back out.
dsx1OtherLoop Loopbacks that are not defined here.
dsx1InwardLoop The transmitted signal at this interface is looped back and received by the same interface. What is transmitted onto the line is product dependent.
dsx1DualLoop Both dsx1LineLoop and dsx1InwardLoop will be active simultaneously." ::= { dsx1ConfigEntry 9 }
dsx1LineStatus OBJECT-TYPE SYNTAX INTEGER (1..131071) MAX-ACCESS read-only STATUS current DESCRIPTION
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"This variable indicates the Line Status of the interface. It contains loopback, failure, received 'alarm' and transmitted 'alarms information.
The dsx1LineStatus is a bit map represented as a sum, therefore, it can represent multiple failures (alarms) and a LoopbackState simultaneously.
dsx1NoAlarm must be set if and only if no other flag is set.
If the dsx1loopbackState bit is set, the loopback in effect can be determined from the dsx1loopbackConfig object. The various bit positions are: 1 dsx1NoAlarm No alarm present 2 dsx1RcvFarEndLOF Far end LOF (a.k.a., Yellow Alarm) 4 dsx1XmtFarEndLOF Near end sending LOF Indication 8 dsx1RcvAIS Far end sending AIS 16 dsx1XmtAIS Near end sending AIS 32 dsx1LossOfFrame Near end LOF (a.k.a., Red Alarm) 64 dsx1LossOfSignal Near end Loss Of Signal 128 dsx1LoopbackState Near end is looped 256 dsx1T16AIS E1 TS16 AIS 512 dsx1RcvFarEndLOMF Far End Sending TS16 LOMF 1024 dsx1XmtFarEndLOMF Near End Sending TS16 LOMF 2048 dsx1RcvTestCode Near End detects a test code 4096 dsx1OtherFailure any line status not defined here 8192 dsx1UnavailSigState Near End in Unavailable Signal State 16384 dsx1NetEquipOOS Carrier Equipment Out of Service 32768 dsx1RcvPayloadAIS DS2 Payload AIS 65536 dsx1Ds2PerfThreshold DS2 Performance Threshold Exceeded" ::= { dsx1ConfigEntry 10 }
dsx1SignalMode OBJECT-TYPE SYNTAX INTEGER { none (1), robbedBit (2), bitOriented (3), messageOriented (4), other (5) } MAX-ACCESS read-write STATUS current DESCRIPTION
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"'none' indicates that no bits are reserved for signaling on this channel.
'robbedBit' indicates that DS1 Robbed Bit Sig- naling is in use.
'bitOriented' indicates that E1 Channel Asso- ciated Signaling is in use.
'messageOriented' indicates that Common Chan- nel Signaling is in use either on channel 16 of an E1 link or channel 24 of a DS1." ::= { dsx1ConfigEntry 11 }
dsx1TransmitClockSource OBJECT-TYPE SYNTAX INTEGER { loopTiming(1), localTiming(2), throughTiming(3) } MAX-ACCESS read-write STATUS current DESCRIPTION "The source of Transmit Clock. 'loopTiming' indicates that the recovered re- ceive clock is used as the transmit clock.
'localTiming' indicates that a local clock source is used or when an external clock is attached to the box containing the interface.
'throughTiming' indicates that recovered re- ceive clock from another interface is used as the transmit clock." ::= { dsx1ConfigEntry 12 }
dsx1Fdl OBJECT-TYPE SYNTAX INTEGER (1..15) MAX-ACCESS read-write STATUS current DESCRIPTION "This bitmap describes the use of the facili- ties data link, and is the sum of the capabili- ties. Set any bits that are appropriate:
other(1), dsx1AnsiT1403(2), dsx1Att54016(4),
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dsx1FdlNone(8)
'other' indicates that a protocol other than one following is used.
'dsx1AnsiT1403' refers to the FDL exchange recommended by ANSI.
'dsx1Att54016' refers to ESF FDL exchanges.
'dsx1FdlNone' indicates that the device does not use the FDL." ::= { dsx1ConfigEntry 13 }
dsx1InvalidIntervals OBJECT-TYPE SYNTAX INTEGER (0..96) MAX-ACCESS read-only STATUS current DESCRIPTION "The number of intervals in the range from 0 to dsx1ValidIntervals for which no data is available. This object will typically be zero except in cases where the data for some intervals are not available (e.g., in proxy situations)." ::= { dsx1ConfigEntry 14 }
dsx1LineLength OBJECT-TYPE SYNTAX INTEGER (0..64000) UNITS "meters" MAX-ACCESS read-write STATUS current DESCRIPTION "The length of the ds1 line in meters. This objects provides information for line build out circuitry. This object is only useful if the interface has configurable line build out circuitry."
::= { dsx1ConfigEntry 15 }
dsx1LineStatusLastChange OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of MIB II's sysUpTime object at the time this DS1 entered its current line status state. If the current state was entered prior to
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the last re-initialization of the proxy-agent, then this object contains a zero value." ::= { dsx1ConfigEntry 16 }
dsx1LineStatusChangeTrapEnable OBJECT-TYPE SYNTAX INTEGER { enabled(1), disabled(2) } MAX-ACCESS read-write STATUS current DESCRIPTION "Indicates whether dsx1LineStatusChange traps should be generated for this interface." DEFVAL { disabled } ::= { dsx1ConfigEntry 17 }
dsx1LoopbackStatus OBJECT-TYPE SYNTAX INTEGER (1..127) MAX-ACCESS read-only STATUS current DESCRIPTION "This variable represents the current state of the loopback on the DS1 interface. It contains information about loopbacks established by a manager and remotely from the far end.
The dsx1LoopbackStatus is a bit map represented as a sum, therefore is can represent multiple loopbacks simultaneously.
The various bit positions are: 1 dsx1NoLoopback 2 dsx1NearEndPayloadLoopback 4 dsx1NearEndLineLoopback 8 dsx1NearEndOtherLoopback 16 dsx1NearEndInwardLoopback 32 dsx1FarEndPayloadLoopback 64 dsx1FarEndLineLoopback"
::= { dsx1ConfigEntry 18 }
dsx1Ds1ChannelNumber OBJECT-TYPE SYNTAX INTEGER (0..28) MAX-ACCESS read-only STATUS current DESCRIPTION "This variable represents the channel number of
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the DS1/E1 on its parent Ds2/E2 or DS3/E3. A value of 0 indicated this DS1/E1 does not have a parent DS3/E3."
::= { dsx1ConfigEntry 19 }
dsx1Channelization OBJECT-TYPE SYNTAX INTEGER { disabled(1), enabledDs0(2), enabledDs1(3) } MAX-ACCESS read-write STATUS current DESCRIPTION "Indicates whether this ds1/e1 is channelized or unchannelized. The value of enabledDs0 indicates that this is a DS1 channelized into DS0s. The value of enabledDs1 indicated that this is a DS2 channelized into DS1s. Setting this value will cause the creation or deletion of entries in the ifTable for the DS0s that are within the DS1." ::= { dsx1ConfigEntry 20 }
-- The DS1 Current Table dsx1CurrentTable OBJECT-TYPE SYNTAX SEQUENCE OF Dsx1CurrentEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The DS1 current table contains various statistics being collected for the current 15 minute interval." ::= { ds1 7 }
dsx1CurrentEntry OBJECT-TYPE SYNTAX Dsx1CurrentEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the DS1 Current table." INDEX { dsx1CurrentIndex } ::= { dsx1CurrentTable 1 }
dsx1CurrentIndex OBJECT-TYPE SYNTAX InterfaceIndex MAX-ACCESS read-only STATUS current DESCRIPTION "The index value which uniquely identifies the DS1 interface to which this entry is applicable. The interface identified by a particular value of this index is the same interface as identified by the same value as a dsx1LineIndex object instance." ::= { dsx1CurrentEntry 1 }
dsx1CurrentESs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Errored Seconds." ::= { dsx1CurrentEntry 2 }
dsx1CurrentSESs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Severely Errored Seconds." ::= { dsx1CurrentEntry 3 }
dsx1CurrentSEFSs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Severely Errored Framing Seconds." ::= { dsx1CurrentEntry 4 }
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dsx1CurrentUASs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Unavailable Seconds." ::= { dsx1CurrentEntry 5 }
dsx1CurrentCSSs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Controlled Slip Seconds." ::= { dsx1CurrentEntry 6 }
dsx1CurrentPCVs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Path Coding Violations." ::= { dsx1CurrentEntry 7 }
dsx1CurrentLESs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Line Errored Seconds." ::= { dsx1CurrentEntry 8 }
dsx1CurrentBESs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Bursty Errored Seconds." ::= { dsx1CurrentEntry 9 }
dsx1CurrentDMs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Degraded Minutes." ::= { dsx1CurrentEntry 10 }
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dsx1CurrentLCVs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Line Code Violations (LCVs)." ::= { dsx1CurrentEntry 11 }
-- The DS1 Interval Table dsx1IntervalTable OBJECT-TYPE SYNTAX SEQUENCE OF Dsx1IntervalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The DS1 Interval Table contains various statistics collected by each DS1 Interface over the previous 24 hours of operation. The past 24 hours are broken into 96 completed 15 minute intervals. Each row in this table represents one such interval (identified by dsx1IntervalNumber) for one specific instance (identified by dsx1IntervalIndex)." ::= { ds1 8 }
dsx1IntervalEntry OBJECT-TYPE SYNTAX Dsx1IntervalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the DS1 Interval table." INDEX { dsx1IntervalIndex, dsx1IntervalNumber } ::= { dsx1IntervalTable 1 }
dsx1IntervalIndex OBJECT-TYPE SYNTAX InterfaceIndex MAX-ACCESS read-only STATUS current DESCRIPTION "The index value which uniquely identifies the DS1 interface to which this entry is applicable. The interface identified by a particular value of this index is the same interface as identified by the same value as a dsx1LineIndex object instance." ::= { dsx1IntervalEntry 1 }
dsx1IntervalNumber OBJECT-TYPE SYNTAX INTEGER (1..96) MAX-ACCESS read-only STATUS current DESCRIPTION "A number between 1 and 96, where 1 is the most recently completed 15 minute interval and 96 is the 15 minutes interval completed 23 hours and 45 minutes prior to interval 1." ::= { dsx1IntervalEntry 2 }
dsx1IntervalESs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Errored Seconds." ::= { dsx1IntervalEntry 3 }
dsx1IntervalSESs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Severely Errored Seconds." ::= { dsx1IntervalEntry 4 }
dsx1IntervalSEFSs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Severely Errored Framing Seconds."
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::= { dsx1IntervalEntry 5 }
dsx1IntervalUASs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Unavailable Seconds. This object may decrease if the occurance of unavailable seconds occurs across an inteval boundary." ::= { dsx1IntervalEntry 6 }
dsx1IntervalCSSs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Controlled Slip Seconds." ::= { dsx1IntervalEntry 7 }
dsx1IntervalPCVs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Path Coding Violations." ::= { dsx1IntervalEntry 8 }
dsx1IntervalLESs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Line Errored Seconds." ::= { dsx1IntervalEntry 9 }
dsx1IntervalBESs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Bursty Errored Seconds." ::= { dsx1IntervalEntry 10 }
dsx1IntervalDMs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current
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DESCRIPTION "The number of Degraded Minutes." ::= { dsx1IntervalEntry 11 }
dsx1IntervalLCVs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Line Code Violations." ::= { dsx1IntervalEntry 12 }
dsx1IntervalValidData OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-only STATUS current DESCRIPTION "This variable indicates if the data for this interval is valid." ::= { dsx1IntervalEntry 13 }
-- The DS1 Total Table dsx1TotalTable OBJECT-TYPE SYNTAX SEQUENCE OF Dsx1TotalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The DS1 Total Table contains the cumulative sum of the various statistics for the 24 hour period preceding the current interval." ::= { ds1 9 }
dsx1TotalEntry OBJECT-TYPE SYNTAX Dsx1TotalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the DS1 Total table." INDEX { dsx1TotalIndex } ::= { dsx1TotalTable 1 }
dsx1TotalIndex OBJECT-TYPE SYNTAX InterfaceIndex MAX-ACCESS read-only STATUS current DESCRIPTION "The index value which uniquely identifies the DS1 interface to which this entry is applicable. The interface identified by a particular value of this index is the same interface as identified by the same value as a dsx1LineIndex object instance."
::= { dsx1TotalEntry 1 }
dsx1TotalESs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The sum of Errored Seconds encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1TotalEntry 2 }
dsx1TotalSESs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Severely Errored Seconds encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1TotalEntry 3 }
dsx1TotalSEFSs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Severely Errored Framing Seconds
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encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1TotalEntry 4 }
dsx1TotalUASs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Unavailable Seconds encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1TotalEntry 5 }
dsx1TotalCSSs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Controlled Slip Seconds encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1TotalEntry 6 }
dsx1TotalPCVs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Path Coding Violations encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1TotalEntry 7 }
dsx1TotalLESs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Line Errored Seconds encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1TotalEntry 8 }
dsx1TotalBESs OBJECT-TYPE
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SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Bursty Errored Seconds (BESs) encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1TotalEntry 9 }
dsx1TotalDMs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Degraded Minutes (DMs) encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1TotalEntry 10 }
dsx1TotalLCVs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Line Code Violations (LCVs) encountered by a DS1 interface in the current 15 minute interval. Invalid 15 minute intervals count as 0." ::= { dsx1TotalEntry 11 }
-- The DS1 Channel Table dsx1ChanMappingTable OBJECT-TYPE SYNTAX SEQUENCE OF Dsx1ChanMappingEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The DS1 Channel Mapping table. This table maps a DS1 channel number on a particular DS3 into an ifIndex. In the presence of DS2s, this table can be used to map a DS2 channel number on a DS3 into an ifIndex, or used to map a DS1 channel number on a DS2 onto an ifIndex." ::= { ds1 16 }
MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the DS1 Channel Mapping table. There is an entry in this table corresponding to each ds1 ifEntry within any interface that is channelized to the individual ds1 ifEntry level.
This table is intended to facilitate mapping from channelized interface / channel number to DS1 ifEntry. (e.g. mapping (DS3 ifIndex, DS1 Channel Number) -> ifIndex)
While this table provides information that can also be found in the ifStackTable and dsx1ConfigTable, it provides this same information with a single table lookup, rather than by walking the ifStackTable to find the various constituent ds1 ifTable entries, and testing various dsx1ConfigTable entries to check for the entry with the applicable DS1 channel number." INDEX { ifIndex, dsx1Ds1ChannelNumber } ::= { dsx1ChanMappingTable 1 }
dsx1ChanMappedIfIndex OBJECT-TYPE SYNTAX InterfaceIndex MAX-ACCESS read-only STATUS current DESCRIPTION "This object indicates the ifIndex value assigned by the agent for the individual ds1 ifEntry that corresponds to the given DS1 channel number (specified by the INDEX element dsx1Ds1ChannelNumber) of the given channelized interface (specified by INDEX element ifIndex)." ::= { dsx1ChanMappingEntry 1 }
-- The DS1 Far End Current Table
dsx1FarEndCurrentTable OBJECT-TYPE SYNTAX SEQUENCE OF Dsx1FarEndCurrentEntry MAX-ACCESS not-accessible
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STATUS current DESCRIPTION "The DS1 Far End Current table contains various statistics being collected for the current 15 minute interval. The statistics are collected from the far end messages on the Facilities Data Link. The definitions are the same as described for the near-end information." ::= { ds1 10 }
dsx1FarEndCurrentEntry OBJECT-TYPE SYNTAX Dsx1FarEndCurrentEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the DS1 Far End Current table." INDEX { dsx1FarEndCurrentIndex } ::= { dsx1FarEndCurrentTable 1 }
dsx1FarEndCurrentIndex OBJECT-TYPE SYNTAX InterfaceIndex MAX-ACCESS read-only STATUS current DESCRIPTION "The index value which uniquely identifies the DS1 interface to which this entry is applicable. The interface identified by a particular value of this index is identical to the interface identified by the same value of dsx1LineIndex." ::= { dsx1FarEndCurrentEntry 1 }
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dsx1FarEndTimeElapsed OBJECT-TYPE SYNTAX INTEGER (0..899) MAX-ACCESS read-only STATUS current DESCRIPTION "The number of seconds that have elapsed since the beginning of the far end current error-measurement period. If, for some reason, such as an adjustment in the system's time-of-day clock, the current interval exceeds the maximum value, the agent will return the maximum value." ::= { dsx1FarEndCurrentEntry 2 }
dsx1FarEndValidIntervals OBJECT-TYPE SYNTAX INTEGER (0..96) MAX-ACCESS read-only STATUS current DESCRIPTION "The number of previous far end intervals for which data was collected. The value will be 96 unless the interface was brought online within the last 24 hours, in which case the value will be the number of complete 15 minute far end intervals since the interface has been online." ::= { dsx1FarEndCurrentEntry 3 }
dsx1FarEndCurrentESs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Errored Seconds." ::= { dsx1FarEndCurrentEntry 4 }
dsx1FarEndCurrentSESs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Severely Errored Seconds."
::= { dsx1FarEndCurrentEntry 5 }
dsx1FarEndCurrentSEFSs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION
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"The number of Far End Severely Errored Framing Seconds." ::= { dsx1FarEndCurrentEntry 6 }
dsx1FarEndCurrentUASs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Unavailable Seconds." ::= { dsx1FarEndCurrentEntry 7 }
dsx1FarEndCurrentCSSs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Controlled Slip Seconds." ::= { dsx1FarEndCurrentEntry 8 }
dsx1FarEndCurrentLESs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Line Errored Seconds." ::= { dsx1FarEndCurrentEntry 9 }
dsx1FarEndCurrentPCVs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Path Coding Violations." ::= { dsx1FarEndCurrentEntry 10 }
dsx1FarEndCurrentBESs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Bursty Errored Seconds." ::= { dsx1FarEndCurrentEntry 11 }
dsx1FarEndCurrentDMs OBJECT-TYPE SYNTAX PerfCurrentCount MAX-ACCESS read-only STATUS current
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DESCRIPTION "The number of Far End Degraded Minutes." ::= { dsx1FarEndCurrentEntry 12 }
dsx1FarEndInvalidIntervals OBJECT-TYPE SYNTAX INTEGER (0..96) MAX-ACCESS read-only STATUS current DESCRIPTION "The number of intervals in the range from 0 to dsx1FarEndValidIntervals for which no data is available. This object will typically be zero except in cases where the data for some intervals are not available (e.g., in proxy situations)." ::= { dsx1FarEndCurrentEntry 13 }
-- The DS1 Far End Interval Table dsx1FarEndIntervalTable OBJECT-TYPE SYNTAX SEQUENCE OF Dsx1FarEndIntervalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The DS1 Far End Interval Table contains various statistics collected by each DS1 interface over the previous 24 hours of operation. The past 24 hours are broken into 96 completed 15 minute intervals. Each row in this table represents one such interval (identified by dsx1FarEndIntervalNumber) for one specific instance (identified by dsx1FarEndIntervalIndex)." ::= { ds1 11 }
dsx1FarEndIntervalEntry OBJECT-TYPE SYNTAX Dsx1FarEndIntervalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the DS1 Far End Interval table."
INDEX { dsx1FarEndIntervalIndex, dsx1FarEndIntervalNumber } ::= { dsx1FarEndIntervalTable 1 }
dsx1FarEndIntervalIndex OBJECT-TYPE SYNTAX InterfaceIndex MAX-ACCESS read-only STATUS current DESCRIPTION "The index value which uniquely identifies the DS1 interface to which this entry is applicable. The interface identified by a particular value of this index is identical to the interface identified by the same value of dsx1LineIndex." ::= { dsx1FarEndIntervalEntry 1 }
dsx1FarEndIntervalNumber OBJECT-TYPE SYNTAX INTEGER (1..96) MAX-ACCESS read-only STATUS current DESCRIPTION "A number between 1 and 96, where 1 is the most recently completed 15 minute interval and 96 is the 15 minutes interval completed 23 hours and 45 minutes prior to interval 1." ::= { dsx1FarEndIntervalEntry 2 }
dsx1FarEndIntervalESs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Errored Seconds." ::= { dsx1FarEndIntervalEntry 3 }
dsx1FarEndIntervalSESs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Severely Errored Seconds."
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::= { dsx1FarEndIntervalEntry 4 }
dsx1FarEndIntervalSEFSs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Severely Errored Framing Seconds." ::= { dsx1FarEndIntervalEntry 5 }
dsx1FarEndIntervalUASs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Unavailable Seconds." ::= { dsx1FarEndIntervalEntry 6 }
dsx1FarEndIntervalCSSs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Controlled Slip Seconds." ::= { dsx1FarEndIntervalEntry 7 }
dsx1FarEndIntervalLESs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Line Errored Seconds."
::= { dsx1FarEndIntervalEntry 8 }
dsx1FarEndIntervalPCVs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Path Coding Violations." ::= { dsx1FarEndIntervalEntry 9 }
dsx1FarEndIntervalBESs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current
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DESCRIPTION "The number of Far End Bursty Errored Seconds." ::= { dsx1FarEndIntervalEntry 10 }
dsx1FarEndIntervalDMs OBJECT-TYPE SYNTAX PerfIntervalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Degraded Minutes." ::= { dsx1FarEndIntervalEntry 11 }
dsx1FarEndIntervalValidData OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-only STATUS current DESCRIPTION "This variable indicates if the data for this interval is valid." ::= { dsx1FarEndIntervalEntry 12 }
-- The DS1 Far End Total Table
dsx1FarEndTotalTable OBJECT-TYPE SYNTAX SEQUENCE OF Dsx1FarEndTotalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The DS1 Far End Total Table contains the cumulative sum of the various statistics for the 24 hour period preceding the current interval." ::= { ds1 12 }
dsx1FarEndTotalEntry OBJECT-TYPE SYNTAX Dsx1FarEndTotalEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the DS1 Far End Total table." INDEX { dsx1FarEndTotalIndex } ::= { dsx1FarEndTotalTable 1 }
dsx1FarEndTotalIndex OBJECT-TYPE SYNTAX InterfaceIndex MAX-ACCESS read-only STATUS current DESCRIPTION "The index value which uniquely identifies the DS1 interface to which this entry is applicable. The interface identified by a particular value of this index is identical to the interface identified by the same value of dsx1LineIndex."
::= { dsx1FarEndTotalEntry 1 }
dsx1FarEndTotalESs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Errored Seconds encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1FarEndTotalEntry 2 }
dsx1FarEndTotalSESs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Severely Errored Seconds encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1FarEndTotalEntry 3 }
dsx1FarEndTotalSEFSs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION
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"The number of Far End Severely Errored Framing Seconds encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1FarEndTotalEntry 4 }
dsx1FarEndTotalUASs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Unavailable Seconds encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1FarEndTotalEntry 5 }
dsx1FarEndTotalCSSs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Controlled Slip Seconds encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1FarEndTotalEntry 6 }
dsx1FarEndTotalLESs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Line Errored Seconds encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1FarEndTotalEntry 7 }
dsx1FarEndTotalPCVs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Far End Path Coding Violations reported via the far end block error count encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0."
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::= { dsx1FarEndTotalEntry 8 }
dsx1FarEndTotalBESs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Bursty Errored Seconds (BESs) encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1FarEndTotalEntry 9 }
dsx1FarEndTotalDMs OBJECT-TYPE SYNTAX PerfTotalCount MAX-ACCESS read-only STATUS current DESCRIPTION "The number of Degraded Minutes (DMs) encountered by a DS1 interface in the previous 24 hour interval. Invalid 15 minute intervals count as 0." ::= { dsx1FarEndTotalEntry 10 }
-- The DS1 Fractional Table dsx1FracTable OBJECT-TYPE SYNTAX SEQUENCE OF Dsx1FracEntry MAX-ACCESS not-accessible STATUS deprecated DESCRIPTION "This table is deprecated in favour of using ifStackTable.
The table was mandatory for systems dividing a DS1 into channels containing different data streams that are of local interest. Systems which are indifferent to data content, such as CSUs, need not implement it.
The DS1 fractional table identifies which DS1 channels associated with a CSU are being used to support a logical interface, i.e., an entry in the interfaces table from the Internet-standard MIB.
For example, consider an application managing a North American ISDN Primary Rate link whose division is a 384 kbit/s H1 _B_ Channel for Video,
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a second H1 for data to a primary routing peer, and 12 64 kbit/s H0 _B_ Channels. Consider that some subset of the H0 channels are used for voice and the remainder are available for dynamic data calls.
We count a total of 14 interfaces multiplexed onto the DS1 interface. Six DS1 channels (for the sake of the example, channels 1..6) are used for Video, six more (7..11 and 13) are used for data, and the remaining 12 are are in channels 12 and 14..24.
Let us further imagine that ifIndex 2 is of type DS1 and refers to the DS1 interface, and that the interfaces layered onto it are numbered 3..16.
For North American (DS1) interfaces, there are 24 legal channels, numbered 1 through 24.
For G.704 interfaces, there are 31 legal channels, numbered 1 through 31. The channels (1..31) correspond directly to the equivalently numbered time-slots." ::= { ds1 13 }
dsx1FracEntry OBJECT-TYPE SYNTAX Dsx1FracEntry MAX-ACCESS not-accessible STATUS deprecated DESCRIPTION "An entry in the DS1 Fractional table." INDEX { dsx1FracIndex, dsx1FracNumber } ::= { dsx1FracTable 1 }
dsx1FracIndex OBJECT-TYPE SYNTAX INTEGER (1..'7fffffff'h) MAX-ACCESS read-only STATUS deprecated DESCRIPTION "The index value which uniquely identifies the DS1 interface to which this entry is applicable The interface identified by a particular value of this index is the same interface as identified by the same value an dsx1LineIndex object instance." ::= { dsx1FracEntry 1 }
dsx1FracNumber OBJECT-TYPE SYNTAX INTEGER (1..31) MAX-ACCESS read-only STATUS deprecated DESCRIPTION "The channel number for this entry." ::= { dsx1FracEntry 2 }
dsx1FracIfIndex OBJECT-TYPE SYNTAX INTEGER (1..'7fffffff'h) MAX-ACCESS read-write STATUS deprecated DESCRIPTION "An index value that uniquely identifies an interface. The interface identified by a particular value of this index is the same interface as identified by the same value an ifIndex object instance. If no interface is currently using a channel, the value should be zero. If a single interface occupies more than one time slot, that ifIndex value will be found in multiple time slots." ::= { dsx1FracEntry 3 }
-- Ds1 TRAPS
ds1Traps OBJECT IDENTIFIER ::= { ds1 15 }
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dsx1LineStatusChange NOTIFICATION-TYPE OBJECTS { dsx1LineStatus, dsx1LineStatusLastChange } STATUS current DESCRIPTION "A dsx1LineStatusChange trap is sent when the value of an instance dsx1LineStatus changes. It can be utilized by an NMS to trigger polls. When the line status change results from a higher level line status change (i.e. ds3), then no traps for the ds1 are sent." ::= { ds1Traps 0 1 }
ds1Compliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for T1 and E1 interfaces." MODULE -- this module MANDATORY-GROUPS { ds1NearEndConfigGroup, ds1NearEndStatisticsGroup }
GROUP ds1FarEndGroup DESCRIPTION "Implementation of this group is optional for all systems that attach to a DS1 Interface."
GROUP ds1NearEndOptionalConfigGroup DESCRIPTION "Implementation of this group is optional for all systems that attach to a DS1 Interface."
GROUP ds1DS2Group DESCRIPTION "Implementation of this group is mandatory for all systems that attach to a DS2 Interface."
GROUP ds1TransStatsGroup
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DESCRIPTION "This group is the set of statistics appropriate for all systems which attach to a DS1 Interface running transparent or unFramed lineType."
GROUP ds1ChanMappingGroup DESCRIPTION "This group is the set of objects for mapping a DS3 Channel (ds1ChannelNumber) to ifIndex.
Implementation of this group is mandatory for systems which support the channelization of DS3s into DS1s."
OBJECT dsx1LineType MIN-ACCESS read-only DESCRIPTION "The ability to set the line type is not required."
OBJECT dsx1LineCoding MIN-ACCESS read-only DESCRIPTION "The ability to set the line coding is not required."
OBJECT dsx1SendCode MIN-ACCESS read-only DESCRIPTION "The ability to set the send code is not required."
OBJECT dsx1LoopbackConfig MIN-ACCESS read-only DESCRIPTION "The ability to set loopbacks is not required."
OBJECT dsx1SignalMode MIN-ACCESS read-only DESCRIPTION "The ability to set the signal mode is not required."
OBJECT dsx1TransmitClockSource MIN-ACCESS read-only DESCRIPTION "The ability to set the transmit clock source is
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not required."
OBJECT dsx1Fdl MIN-ACCESS read-only DESCRIPTION "The ability to set the FDL is not required."
OBJECT dsx1LineLength MIN-ACCESS read-only DESCRIPTION "The ability to set the line length is not required."
OBJECT dsx1Channelization MIN-ACCESS read-only DESCRIPTION "The ability to set the channelization is not required." ::= { ds1Compliances 1 }
ds1MibT1PriCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "Compliance statement for using this MIB for ISDN Primary Rate interfaces on T1 lines." MODULE MANDATORY-GROUPS { ds1NearEndConfigGroup, ds1NearEndStatisticsGroup } OBJECT dsx1LineType SYNTAX INTEGER { dsx1ESF(2) -- Intl Spec would be G704(2) -- or I.431(4) } MIN-ACCESS read-only DESCRIPTION "Line type for T1 ISDN Primary Rate interfaces."
OBJECT dsx1LineCoding SYNTAX INTEGER { dsx1B8ZS(2) } MIN-ACCESS read-only DESCRIPTION "Type of Zero Code Suppression for T1 ISDN Primary Rate interfaces."
OBJECT dsx1SignalMode
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SYNTAX INTEGER { none(1), -- if there is no signaling channel messageOriented(4) } MIN-ACCESS read-only DESCRIPTION "Possible signaling modes for T1 ISDN Primary Rate interfaces."
OBJECT dsx1TransmitClockSource SYNTAX INTEGER { loopTiming(1) } MIN-ACCESS read-only DESCRIPTION "The transmit clock is derived from received clock on ISDN Primary Rate interfaces."
OBJECT dsx1Fdl MIN-ACCESS read-only DESCRIPTION "Facilities Data Link usage on T1 ISDN Primary Rate interfaces. Note: Eventually dsx1Att-54016(4) is to be used here since the line type is ESF."
OBJECT dsx1Channelization MIN-ACCESS read-only DESCRIPTION "The ability to set the channelization is not required." ::= { ds1Compliances 2 }
ds1MibE1PriCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "Compliance statement for using this MIB for ISDN Primary Rate interfaces on E1 lines." MODULE MANDATORY-GROUPS { ds1NearEndConfigGroup, ds1NearEndStatisticsGroup } OBJECT dsx1LineType SYNTAX INTEGER { dsx1E1CRC(5) } MIN-ACCESS read-only
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DESCRIPTION "Line type for E1 ISDN Primary Rate interfaces."
OBJECT dsx1LineCoding SYNTAX INTEGER { dsx1HDB3(3) } MIN-ACCESS read-only DESCRIPTION "Type of Zero Code Suppression for E1 ISDN Primary Rate interfaces."
OBJECT dsx1TransmitClockSource SYNTAX INTEGER { loopTiming(1) } MIN-ACCESS read-only DESCRIPTION "The transmit clock is derived from received clock on ISDN Primary Rate interfaces."
OBJECT dsx1Fdl MIN-ACCESS read-only DESCRIPTION "Facilities Data Link usage on E1 ISDN Primary Rate interfaces. Note: There is a 'M-Channel' in E1, using National Bit Sa4 (G704, Table 4a). It is used to implement management features between ET and NT. This is different to FDL in T1, which is used to carry control signals and performance data. In E1, control and status signals are carried using National Bits Sa5, Sa6 and A (RAI Ind.). This indicates that only the other(1) or eventually the dsx1Fdl-none(8) bits should
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be set in this object for E1 PRI."
OBJECT dsx1Channelization MIN-ACCESS read-only DESCRIPTION "The ability to set the channelization is not required." ::= { ds1Compliances 3 }
ds1Ds2Compliance MODULE-COMPLIANCE STATUS current DESCRIPTION "Compliance statement for using this MIB for DS2 interfaces." MODULE MANDATORY-GROUPS { ds1DS2Group }
OBJECT dsx1Channelization MIN-ACCESS read-only DESCRIPTION "The ability to set the channelization is not required." ::= { ds1Compliances 4 }
-- units of conformance
ds1NearEndConfigGroup OBJECT-GROUP OBJECTS { dsx1LineIndex, dsx1TimeElapsed, dsx1ValidIntervals, dsx1LineType, dsx1LineCoding, dsx1SendCode, dsx1CircuitIdentifier, dsx1LoopbackConfig, dsx1LineStatus, dsx1SignalMode, dsx1TransmitClockSource, dsx1Fdl, dsx1InvalidIntervals, dsx1LineLength, dsx1LoopbackStatus, dsx1Ds1ChannelNumber, dsx1Channelization } STATUS current DESCRIPTION "A collection of objects providing configuration
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information applicable to all DS1 interfaces." ::= { ds1Groups 1 }
ds1NearEndStatisticsGroup OBJECT-GROUP OBJECTS { dsx1CurrentIndex, dsx1CurrentESs, dsx1CurrentSESs, dsx1CurrentSEFSs, dsx1CurrentUASs, dsx1CurrentCSSs, dsx1CurrentPCVs, dsx1CurrentLESs, dsx1CurrentBESs, dsx1CurrentDMs, dsx1CurrentLCVs, dsx1IntervalIndex, dsx1IntervalNumber, dsx1IntervalESs, dsx1IntervalSESs, dsx1IntervalSEFSs, dsx1IntervalUASs, dsx1IntervalCSSs, dsx1IntervalPCVs, dsx1IntervalLESs, dsx1IntervalBESs, dsx1IntervalDMs, dsx1IntervalLCVs, dsx1IntervalValidData, dsx1TotalIndex, dsx1TotalESs, dsx1TotalSESs, dsx1TotalSEFSs, dsx1TotalUASs, dsx1TotalCSSs, dsx1TotalPCVs, dsx1TotalLESs, dsx1TotalBESs, dsx1TotalDMs, dsx1TotalLCVs } STATUS current DESCRIPTION "A collection of objects providing statistics information applicable to all DS1 interfaces." ::= { ds1Groups 2 }
ds1DeprecatedGroup OBJECT-GROUP OBJECTS { dsx1IfIndex, dsx1FracIndex, dsx1FracNumber, dsx1FracIfIndex } STATUS deprecated DESCRIPTION "A collection of obsolete objects that may be implemented for backwards compatibility."
STATUS current DESCRIPTION "A collection of objects that may be implemented on DS1 and DS2 interfaces." ::= { ds1Groups 5 }
ds1DS2Group OBJECT-GROUP OBJECTS { dsx1LineIndex, dsx1LineType, dsx1LineCoding, dsx1SendCode, dsx1LineStatus, dsx1SignalMode, dsx1TransmitClockSource, dsx1Channelization } STATUS current DESCRIPTION "A collection of objects providing information about DS2 (6,312 kbps) and E2 (8,448 kbps) systems." ::= { ds1Groups 6 }
ds1TransStatsGroup OBJECT-GROUP OBJECTS { dsx1CurrentESs, dsx1CurrentSESs, dsx1CurrentUASs, dsx1IntervalESs, dsx1IntervalSESs, dsx1IntervalUASs, dsx1TotalESs, dsx1TotalSESs, dsx1TotalUASs } STATUS current DESCRIPTION "A collection of objects which are the statistics which can be collected from a ds1 interface that is running transparent or unframed lineType. Statistics not in this list should return noSuchInstance." ::= { ds1Groups 7 }
ds1NearEndOptionalTrapGroup NOTIFICATION-GROUP
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NOTIFICATIONS { dsx1LineStatusChange } STATUS current DESCRIPTION "A collection of notifications that may be implemented on DS1 and DS2 interfaces." ::= { ds1Groups 8 }
ds1ChanMappingGroup OBJECT-GROUP OBJECTS { dsx1ChanMappedIfIndex } STATUS current DESCRIPTION "A collection of objects that give an mapping of DS3 Channel (ds1ChannelNumber) to ifIndex." ::= { ds1Groups 9 }
END
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4. Appendix A - Use of dsx1IfIndex and dsx1LineIndex
This Appendix exists to document the previous use if dsx1IfIndex and dsx1LineIndex and to clarify the relationship of dsx1LineIndex as defined in rfc1406 with the dsx1LineIndex as defined in this document.
The following shows the old and new definitions and the relationship:
[New Definition]: "This object should be made equal to ifIndex. The next paragraph describes its previous usage. Making the object equal to ifIndex allows proper use of ifStackTable and ds0/ds0bundle mibs.
[Old Definition]: "This object is the identifier of a DS1 Interface on a managed device. If there is an ifEntry that is directly associated with this and only this DS1 interface, it should have the same value as ifIndex. Otherwise, number the dsx1LineIndices with an unique identifier following the rules of choosing a number that is greater than ifNumber and numbering the inside interfaces (e.g., equipment side) with even numbers and outside interfaces (e.g, network side) with odd numbers."
When the "Old Definition" was created, it was described this way to allow a manager to treat the value _as if_ it were and ifIndex, i.e. the value would either be: 1) an ifIndex value or 2) a value that was guaranteed to be different from all valid ifIndex values.
The new definition is a subset of that definition, i.e. the value is always an ifIndex value.
The following is Section 3.1 from rfc1406:
Different physical configurations for the support of SNMP with DS1 equipment exist. To accommodate these scenarios, two different indices for DS1 interfaces are introduced in this MIB. These indices are dsx1IfIndex and dsx1LineIndex.
External interface scenario: the SNMP Agent represents all managed DS1 lines as external interfaces (for example, an Agent residing on the device supporting DS1 interfaces directly):
For this scenario, all interfaces are assigned an integer value equal to ifIndex, and the following applies:
ifIndex=dsx1IfIndex=dsx1LineIndex for all interfaces.
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The dsx1IfIndex column of the DS1 Configuration table relates each DS1 interface to its corresponding interface (ifIndex) in the Internet-standard MIB (MIB-II STD 17, RFC1213).
External&Internal interface scenario: the SNMP Agents resides on an host external from the device supporting DS1 interfaces (e.g., a router). The Agent represents both the host and the DS1 device. The index dsx1LineIndex is used to not only represent the DS1 interfaces external from the host/DS1-device combination, but also the DS1 interfaces connecting the host and the DS1 device. The index dsx1IfIndex is always equal to ifIndex.
Example:
A shelf full of CSUs connected to a Router. An SNMP Agent residing on the router proxies for itself and the CSU. The router has also an Ethernet interface:
The assignment of the index values could for example be:
ifIndex (= dsx1IfIndex) dsx1LineIndex 1 NA NA (Ethernet) 2 Line#A Router Side 6 2 Line#A Network Side 7 3 Line#B Router Side 8 3 Line#B Network Side 9 4 Line#C Router Side 10
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4 Line#C Network Side 11 5 Line#D Router Side 12 5 Line#D Network Side 13
For this example, ifNumber is equal to 5. Note the following description of dsx1LineIndex: the dsx1LineIndex identifies a DS1 Interface on a managed device. If there is an ifEntry that is directly associated with this and only this DS1 interface, it should have the same value as ifIndex. Otherwise, number the dsx1LineIndices with an unique identifier following the rules of choosing a number greater than ifNumber and numbering inside interfaces (e.g., equipment side) with even numbers and outside interfaces (e.g., network side) with odd numbers.
If the CSU shelf is managed by itself by a local SNMP Agent, the situation would be:
ifIndex (= dsx1IfIndex) dsx1LineIndex 1 Line#A Network Side 1 2 Line#A RouterSide 2 3 Line#B Network Side 3 4 Line#B RouterSide 4 5 Line#C Network Side 5 6 Line#C Router Side 6 7 Line#D Network Side 7 8 Line#D Router Side 8
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5. Appendix B - The delay approach to Unavialable Seconds.
This procedure is illustrated below for a DS1 ESF interface. Similar rules would apply for other DS1, DS2, and E1 interface variants. The procedure guarantees that the statistical counters are correctly updated at all times, although they lag real time by 10 seconds. At the end of each 15 minutes interval the current interval counts are transferred to the most recent interval entry and each interval is shifted up by one position, with the oldest being discarded if necessary in order to make room. The current interval counts then start over from zero. Note, however, that the signal state calculation does not start afresh at each interval boundary; rather, signal state information is retained across interval boundaries.
+---------------------------------------------------------------------+ | READ COUNTERS & STATUS INFO FROM HARDWARE | | | | BPV EXZ LOS FE CRC CS AIS SEF OOF LOF RAI G1-G6 SE FE LV SL | +---------------------------------------------------------------------+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | V V V V V V V V V V V V V V V V +---------------------------------------------------------------------+ | ACCUM ONE-SEC STATS, CHK ERR THRESHOLDS, & UPDT SIGNAL STATE | | | | |<---------- NEAR END ----------->| |<-------- FAR END ------>| | | | | LCV LES PCV ES CSS BES SES SEFS A/U PCV ES CSS BES SES SEFS A/U | +---------------------------------------------------------------------+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | V V V V V V V V | V V V V V V | +------------------------------+ | +----------------------+ | | ONE-SEC DELAY | | | ONE-SEC DELAY | | | (1 OF 10) | | | (1 OF 10) | | +------------------------------+ | +----------------------+ | | | | | | | | | | | | | | | | | / / / / / / / / / / / / / / / / | | | | | | | | | | | | | | | | V V V V V V V V | V V V V V V | +------------------------------+ | +----------------------+ | | ONE-SEC DELAY | | | ONE-SEC DELAY | | | (10 OF 10) | | | (10 OF 10) | | +------------------------------+ | +----------------------+ | | | | | | | | | | | | | | | | | V V V V V V V V V V V V V V V V
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
+---------------------------------------------------------------------+ | UPDATE STATISTICS COUNTERS | | | |<-------------- NEAR END ----------->| |<--------- FAR END --------->| | | |LCV LES PCV ES CSS BES SES SEFS UAS DM PCV ES CSS BES SES SEFS UAS DM| +---------------------------------------------------------------------+
Note that if such a procedure is adopted there is no current interval data for the first ten seconds after a system comes up. noSuchInstance must be returned if a management station attempts to access the current interval counters during this time.
It is an implementation-specific matter whether an agent assumes that the initial state of the interface is available or unavailable.
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The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights which may cover technology that may be required to practice this standard. Please address the information to the IETF Executive Director.
[1] Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture for Describing SNMP Management Frameworks", RFC 2271, January 1998.
[2] Rose, M. and K. McCloghrie, "Structure and Identification of Management Information for TCP/IP-based Internets", STD 16, RFC 1155, May 1990.
[3] Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16, RFC 1212, March 1991.
[4] Rose, M., "A Convention for Defining Traps for use with the SNMP", RFC 1215, March 1991.
[5] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Structure of Management Information for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1902, January 1996.
[6] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Textual Conventions for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1903, January 1996.
[7] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Conformance Statements for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1904, January 1996.
[8] Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple Network Management Protocol", STD 15, RFC 1157, May 1990.
[9] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Introduction to Community-based SNMPv2", RFC 1901, January 1996.
[10] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1906, January 1996.
[11] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)", RFC 2272, January 1998.
[12] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", RFC 2274, January 1998.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
[13] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1905, January 1996.
[14] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications", RFC 2273, January 1998.
[15] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", RFC 2275, January 1998.
[16] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB using SMIv2", RFC 2233, November 1997.
[17] AT&T Information Systems, AT&T ESF DS1 Channel Service Unit User's Manual, 999-100-305, February 1988.
[18] AT&T Technical Reference, Requirements for Interfacing Digital Terminal Equipment to Services Employing the Extended Superframe Format, Publication 54016, May 1988.
[19] American National Standard for Telecommunications -- Carrier-to- Customer Installation - DS1 Metallic Interface, T1.403, February 1989.
[20] CCITT Specifications Volume III, Recommendation G.703, Physical/Electrical Characteristics of Hierarchical Digital Interfaces, April 1991.
[21] ITU-T G.704: Synchronous frame structures used at 1544, 6312, 2048, 8488 and 44 736 kbit/s Hierarchical Levels, July 1995.
[22] American National Standard for Telecommunications -- Digital Hierarchy -- Layer 1 In-Service Digital Transmission Performace Monitoring, T1.231, Sept 1993.
[23] CCITT Specifications Volume IV, Recommendation O.162, Equipment To Perform In Service Monitoring On 2048 kbit/s Signals, July 1988.
[24] CCITT Specifications Volume III, Recommendation G.821, Error Performance Of An International Digital Connection Forming Part Of An Integrated Services Digital Network, July 1988.
[25] AT&T Technical Reference, Technical Reference 62411, ACCUNET T1.5 Service Description And Interface Specification, December 1990.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
[26] CCITT Specifications Volume III, Recommendation G.706, Frame Alignment and Cyclic Redundancy Check (CRC) Procedures Relating to Basic Frame Structures Defined in Recommendation G.704, July 1988.
[27] CCITT Specifications Volume III, Recommendation G.732, Characteristics Of Primary PCM Multiplex Equipment Operating at 2048 kbit/s, July 1988.
[28] Fowler, D., "Definitions of Managed Objects for the DS3/E3 Interface Types", RFC 2496, Janaury 1999.
[29] Brown, T., and Tesink, K., "Definitions of Managed Objects for the SONET/SDH Interface Type", Work in Progress.
[30] Fowler, D., "Definitions of Managed Objects for the Ds0 and DS0Bundle Interface Types", RFC 2494, January 1999.
[31] ITU-T G.775: Loss of signal (LOS) and alarm indication signal (AIS) defect detection and clearance criteria, May 1995.
[32] ITU-T G.826: Error performance parameters and objectives for international, constant bit rate digital paths at or above the primary rate, November 1993.
[33] American National Standard for Telecommunications -- Digital Hierarchy - Electrical Interfaces, T1.102, December 1993.
[34] American National Standard for Telecommunications -- Digital Hierarchy - Format Specifications, T1.107, August 1988.
[35] Tesink, K., "Textual Conventions for MIB Modules Using Performance History Based on 15 Minute Intervals", RFC XXXX, January 1999.
SNMPv1 by itself is such an insecure environment. Even if the network itself is secure (for example by using IPSec), even then, there is no control as to who on the secure network is allowed to access and GET (read) the objects in this MIB.
It is recommended that the implementors consider the security features as provided by the SNMPv3 framework. Specifically, the use of the User-based Security Model RFC 2274 [12] and the View-based Access Control Model RFC 2275 [15] is recommended.
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RFC 2495 DS1/E1/DS2/E2 MIB January 1999
It is then a customer/user responsibility to ensure that the SNMP entity giving access to an instance of this MIB, is properly configured to give access to those objects only to those principals (users) that have legitimate rights to access them.
Setting any of the following objects to an inappropriate value can cause loss of traffic. The definition of inappropriate varies for each object. In the case of dsx1LineType, for example, both ends of a ds1/e1 must have the same value in order for traffic to flow. In the case of dsx1SendCode and dsx1LoopbackConfig, for another example, traffic may stop transmitting when particular loopbacks are applied.
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