DEC-ATM-SIGNALLING-MIB

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Category: ATM, Vendor: DEC/Digital

Description: Manages ATM signalling protocol configuration and statistics for DEC ATM network equipment.

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What Is DEC-ATM-SIGNALLING-MIB?

DEC-ATM-SIGNALLING-MIB is a legacy Digital Equipment Corporation (DEC) MIB for monitoring ATM (Asynchronous Transfer Mode) signalling protocol operation, specifically the Q.2931 call-control signalling used to establish ATM virtual circuits. It exposes per-interface signalling configuration (decSignallingConfigTable, decAtmSignallingMode) and message-level statistics through decQ2931MsgTable, counting specific Q.2931 message types transmitted and received, such as call proceeding, connect, and connect acknowledge messages. For monitoring purposes this is primarily a protocol-performance/fault MIB: administrators track message counters (callProceedingTx/Rx, connectTx/Rx, connectAcknowledgeTx/Rx) to detect signalling failures, stalled call setups, or abnormal retransmission patterns on ATM links, rather than general hardware sensors like temperature or power. It builds on standard ATM signalling concepts (Q.2931/UNI) and would be used alongside broader ATM interface MIBs (e.g., ATM-MIB) for a complete picture of the ATM subsystem. This MIB reflects an older technology generation and would be found on legacy DEC/Digital ATM switching or routing equipment from the 1990s-2000s era, where DEC-ATM-SIGNALLING-MIB SNMP monitoring remains relevant for tracking Q.2931 call-control health on surviving deployments.

IPNetwork Monitor allows you to monitor SNMP objects defined in DEC-ATM-SIGNALLING-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

DEC/Digital ATM switches and routers (legacy)

Monitoring Examples

An engineer troubleshooting slow or failing ATM circuit establishment would poll decQ2931MsgTable, comparing callProceedingTx/Rx and connectTx/Rx counts per decAtmSignallingIndex to see whether call setup messages are being sent but not acknowledged. A growing gap between connectTx and connectAcknowledgeRx on a given interface would indicate the remote endpoint is not completing call setup, pointing to a signalling or connectivity fault on that ATM link. decAtmSignallingMode would be checked to confirm the interface is configured for the expected UNI signalling variant.

What Can Be Monitored

Q.2931 call setup message counts (proceeding, connect, connect-ack)
signalling mode configuration
per-interface signalling statistics

Imported Objects

From DECATM-MIB

decMIBextension

OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter

From RFC1213-MIB

ifIndex

OIDs

OID symbolic	OID numeric	Type	Access	Description
decAtmSignallingMIB	1.3.6.1.4.1.36.2.18.34
decAtmSignallingMIBObjects	1.3.6.1.4.1.36.2.18.34.1
decSignallingGroup	1.3.6.1.4.1.36.2.18.34.1.1
decSignallingConfigTable	1.3.6.1.4.1.36.2.18.34.1.1.1		not-accessible
decSignallingConfigEntry	1.3.6.1.4.1.36.2.18.34.1.1.1.1		not-accessible	Each entry describes one UNI / NNI. Note that the table is indexed by 'atm' interfaces, rather than 'aal5' entities.
INT decAtmSignallingIndex	1.3.6.1.4.1.36.2.18.34.1.1.1.1.1	INTEGER	read-only	An arbitrary integer index that can be used to distinguish among multiple signalling entities for the same (physical) interface.
INT decAtmSignallingMode	1.3.6.1.4.1.36.2.18.34.1.1.1.1.2	INTEGER	read-write	Indicates the mode in which the port is configured to run.
decQ2931Group	1.3.6.1.4.1.36.2.18.34.1.2
decQ2931MsgTable	1.3.6.1.4.1.36.2.18.34.1.2.1		not-accessible	Describes the number of call/connection processing messages sent and received on each UNI or NNI.
decQ2931MsgEntry	1.3.6.1.4.1.36.2.18.34.1.2.1.1		not-accessible	Each entry contains signalling statistics for one UNI / NNI. Note that the table is indexed by ATM ports (ifType = 'atm') as opposed to AAL5 entities (ifType = 'aal5').
CTR callProceedingTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.1	Counter	read-only	The number of CALL PROCEEDING messages transmitted on this interface.
CTR callProceedingRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.2	Counter	read-only	The number of CALL PROCEEDING messages received on this interface.
CTR connectTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.3	Counter	read-only	The number of CONNECT messages transmitted on this interface.
CTR connectRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.4	Counter	read-only	The number of CONNECT messages received on this interface.
CTR connectAcknowledgeTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.5	Counter	read-only	The number of CONNECT ACKNOWLEDGE messages transmitted on this interface.
CTR connectAcknowledgeRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.6	Counter	read-only	The number of CONNECT ACKNOWLEDGE messages received on this interface.
CTR setupTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.7	Counter	read-only	The number of SETUP messages transmitted on this interface.
CTR setupRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.8	Counter	read-only	The number of SETUP messages received on this interface.
CTR releaseTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.9	Counter	read-only	The number of RELEASE messages transmitted on this interface.
CTR releaseRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.10	Counter	read-only	The number of RELEASE messages received on this interface.
CTR releaseCompleteTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.11	Counter	read-only	The number of RELEASE COMPLETE messages transmitted on this interface.
CTR releaseCompleteRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.12	Counter	read-only	The number of RELEASE COMPLETE messages received on this interface.
CTR restartTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.13	Counter	read-only	The number of RESTART messages transmitted on this interface.
CTR restartRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.14	Counter	read-only	The number of RESTART messages received on this interface.
CTR restartAcknowledgeTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.15	Counter	read-only	The number of RESTART ACKNOWLEDGE messages transmitted on this interface.
CTR restartAcknowledgeRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.16	Counter	read-only	The number of RESTART ACKNOWLEDGE messages received on this interface.
CTR statusTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.17	Counter	read-only	The number of STATUS messages transmitted on this interface.
CTR statusRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.18	Counter	read-only	The number of STATUS messages received on this interface.
CTR statusEnquiryTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.19	Counter	read-only	The number of STATUS ENQUIRY messages transmitted on this interface.
CTR statusEnquiryRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.20	Counter	read-only	The number of STATUS ENQUIRY messages received on this interface.
CTR addPartyTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.21	Counter	read-only	The number of ADD PARTY messages transmitted on this interface.
CTR addPartyRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.22	Counter	read-only	The number of ADD PARTY messages received on this interface.
CTR addPartyAcknowledgeTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.23	Counter	read-only	The number of ADD PARTY ACKNOWLEDGE messages transmitted on this interface.
CTR addPartyAcknowledgeRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.24	Counter	read-only	The number of ADD PARTY ACKNOWLEDGE messages received on this interface.
CTR addPartyRejectTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.25	Counter	read-only	The number of ADD PARTY REJECT messages transmitted on this interface.
CTR addPartyRejectRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.26	Counter	read-only	The number of ADD PARTY REJECT messages received on this interface.
CTR dropPartyTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.27	Counter	read-only	The number of DROP PARTY messages transmitted on this interface.
CTR dropPartyRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.28	Counter	read-only	The number of DROP PARTY messages received on this interface.
CTR dropPartyAcknowledgeTx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.29	Counter	read-only	The number of DROP PARTY ACKNOWLEDGE messages transmitted on this interface.
CTR dropPartyAcknowledgeRx	1.3.6.1.4.1.36.2.18.34.1.2.1.1.30	Counter	read-only	The number of DROP PARTY ACKNOWLEDGE messages received on this interface.
decQ2931StatusTable	1.3.6.1.4.1.36.2.18.34.1.2.2		not-accessible	Contains additional Q2931 signalling statistics.
decQ2931StatusEntry	1.3.6.1.4.1.36.2.18.34.1.2.2.1		not-accessible	Each entry contains signalling statistics for one UNI / NNI. Note that the table is indexed by ATM ports (ifType = 'atm') as opposed to AAL5 entities (ifType = 'aal5').
INT totalConns	1.3.6.1.4.1.36.2.18.34.1.2.2.1.1	INTEGER	read-only	The total number of connections established so far.
INT activeConns	1.3.6.1.4.1.36.2.18.34.1.2.2.1.2	INTEGER	read-only	The number of currently-active connections.
INT lastTxCause	1.3.6.1.4.1.36.2.18.34.1.2.2.1.3	INTEGER	read-only	The most recently transmitted cause code.
INT lastTxDiagnostic	1.3.6.1.4.1.36.2.18.34.1.2.2.1.4	INTEGER	read-only	The most recently transmitted diagnostic code.
INT lastRxCause	1.3.6.1.4.1.36.2.18.34.1.2.2.1.5	INTEGER	read-only	The most recently received cause code.
INT lastRxDiagnostic	1.3.6.1.4.1.36.2.18.34.1.2.2.1.6	INTEGER	read-only	The most recently received diagnostic code.
decQ2931TimerTable	1.3.6.1.4.1.36.2.18.34.1.2.3		not-accessible	Allows network managers to examine and configure the timers used for Q.2931 call processing.
decQ2931TimerEntry	1.3.6.1.4.1.36.2.18.34.1.2.3.1		not-accessible	Each entry contains timers for one UNI / NNI. Note that the table is indexed by ATM ports (ifType = 'atm') as opposed to AAL5 entities (ifType = 'aal5'). Sorry about the cryptic timer names, but that's what the ATM Forum calls these timers in the UNI V3.0 Specification.
INT t303	1.3.6.1.4.1.36.2.18.34.1.2.3.1.1	INTEGER	read-only	SETUP message timeout, in seconds.
INT t308	1.3.6.1.4.1.36.2.18.34.1.2.3.1.2	INTEGER	read-only	RELEASE message timeout, in seconds.
INT t309	1.3.6.1.4.1.36.2.18.34.1.2.3.1.3	INTEGER	read-only	SAAL disconnection timeout, in seconds.
INT t310	1.3.6.1.4.1.36.2.18.34.1.2.3.1.4	INTEGER	read-only	CALL PROCEEDING timeout, in seconds.
INT t313	1.3.6.1.4.1.36.2.18.34.1.2.3.1.5	INTEGER	read-only	CONNECT timeout, in seconds. This timer is only used on the User side of a UNI.
INT t316	1.3.6.1.4.1.36.2.18.34.1.2.3.1.6	INTEGER	read-only	RESTART timeout, in seconds.
INT t317	1.3.6.1.4.1.36.2.18.34.1.2.3.1.7	INTEGER	read-only	RESTART reply timeout, in seconds. This should be less than the value for timer 't316'.
INT t322	1.3.6.1.4.1.36.2.18.34.1.2.3.1.8	INTEGER	read-only	STATUS ENQUIRY timeout, in seconds.
INT t398	1.3.6.1.4.1.36.2.18.34.1.2.3.1.9	INTEGER	read-only	DROP PARTY timeout, in seconds.
INT t399	1.3.6.1.4.1.36.2.18.34.1.2.3.1.10	INTEGER	read-only	ADD PARTY timeout, in seconds.
decQSaalGroup	1.3.6.1.4.1.36.2.18.34.1.3
decQSaalMsgTable	1.3.6.1.4.1.36.2.18.34.1.3.1		not-accessible
decQSaalMsgEntry	1.3.6.1.4.1.36.2.18.34.1.3.1.1		not-accessible	Each entry contains signalling statistics for one UNI / NNI. Note that the table is indexed by ATM ports (ifType = 'atm') as opposed to AAL5 entities (ifType = 'aal5').
CTR txDiscardedSdus	1.3.6.1.4.1.36.2.18.34.1.3.1.1.1	Counter	read-only	The number of outgoing SDUs which were discarded.
CTR rxErrorPdus	1.3.6.1.4.1.36.2.18.34.1.3.1.1.2	Counter	read-only	The number of incoming PDUs which could not be received due to errors.
CTR txErrorPdus	1.3.6.1.4.1.36.2.18.34.1.3.1.1.3	Counter	read-only	The number of transmission errors for outgoing PDUs.
CTR rxDiscardedPdus	1.3.6.1.4.1.36.2.18.34.1.3.1.1.4	Counter	read-only	The number of incoming PDUs which were discarded.
CTR txDiscardedPdus	1.3.6.1.4.1.36.2.18.34.1.3.1.1.5	Counter	read-only	The number of outgoing PDUs which were discarded.
CTR bgnTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.6	Counter	read-only	The number of BGN (Request Initialization) messages transmitted over the interface.
CTR bgnRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.7	Counter	read-only	The number of BGN (Request Initialization) messages received over the interface.
CTR bgakTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.8	Counter	read-only	The number of BGAK (Request Acknowledgement) messages transmitted over the interface.
CTR bgakRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.9	Counter	read-only	The number of BGAK (Request Acknowledgement) messages received over the interface.
CTR endTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.10	Counter	read-only	The number of END (Disconnect Command) messages transmitted over the interface.
CTR endRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.11	Counter	read-only	The number of END (Disconnect Command) messages received over the interface.
CTR endakTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.12	Counter	read-only	The number of ENDAK (Disconnect Acknowledgement) messages transmitted over the interface.
CTR endakRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.13	Counter	read-only	The number of ENDAK (Disconnect Acknowledgement) messages received over the interface.
CTR rsTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.14	Counter	read-only	The number of RS (Resynchronization Command) messages transmitted over the interface.
CTR rsRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.15	Counter	read-only	The number of RS (Resynchronization Command) messages received over the interface.
CTR rsakTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.16	Counter	read-only	The number of RSAK (Resynchronization Acknowledgement) messages transmitted over the interface.
CTR rsakRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.17	Counter	read-only	The number of RSAK (Resynchronization Acknowledgement) messages received over the interface.
CTR bgrejTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.18	Counter	read-only	The number of BGREJ (Connection Reject) messages transmitted over the interface.
CTR bgrejRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.19	Counter	read-only	The number of BGREJ (Connection Reject) messages received over the interface.
CTR sdTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.20	Counter	read-only	The number of SD (Sequenced Connection-Mode Data) messages transmitted over the interface.
CTR sdRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.21	Counter	read-only	The number of SD (Sequenced Connection-Mode Data) messages received over the interface.
CTR sdpTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.22	Counter	read-only	The number of SDP (Sequenced Connection-Mode Data with request for Receive State Information) messages transmitted over the interface. This object only applies to UNI 3.0.
CTR sdpRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.23	Counter	read-only	The number of SDP (Sequenced Connection-Mode Data with request for Receive State Information) messages received over the interface. This object only applies to UNI 3.0.
CTR erTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.24	Counter	read-only	The number of ER (Recovery Command) messages transmitted over the interface. This object is not applicable to UNI 3.0.
CTR erRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.25	Counter	read-only	The number of ER (Recovery Command) messages received over the interface. This object is not applicable to UNI 3.0.
CTR pollTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.26	Counter	read-only	The number of POLL (Transmitter State Information with request for Receive State Information) messages transmitted over the interface.
CTR pollRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.27	Counter	read-only	The number of POLL (Transmitter State Information with request for Receive State Information) messages received over the interface.
CTR statTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.28	Counter	read-only	The number of STAT (Solicited Receiver State Information) messages transmitted over the interface.
CTR statRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.29	Counter	read-only	The number of STAT (Solicited Receiver State Information) messages received over the interface.
CTR ustatTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.30	Counter	read-only	The number of USTAT (Unsolicited Receiver State Info) messages transmitted over the interface.
CTR ustatRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.31	Counter	read-only	The number of USTAT (Unsolicited Receiver State Info) messages received over the interface.
CTR udTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.32	Counter	read-only	The number of UD (Unnumbered User Data) messages transmitted over the interface.
CTR udRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.33	Counter	read-only	The number of UD (Unnumbered User Data) messages received over the interface.
CTR mdTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.34	Counter	read-only	The number of MD (Unnumbered Management Data) messages transmitted over the interface.
CTR mdRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.35	Counter	read-only	The number of MD (Unnumbered Management Data) messages received over the interface.
CTR erakTx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.36	Counter	read-only	The number of ERAK (Recovery Acknowledgement) messages transmitted over the interface. This object is not applicable to UNI 3.0.
CTR erakRx	1.3.6.1.4.1.36.2.18.34.1.3.1.1.37	Counter	read-only	The number of ERAK (Recovery Acknowledgement) messages received over the interface. This object is not applicable to UNI 3.0.

RFC description

Vendor-private MIB for Digital Equipment Corporation ATM switches; defines managed objects for ATM signaling protocols.

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Download DEC-ATM-SIGNALLING-MIB

What Is DEC-ATM-SIGNALLING-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description