ACE20-MIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsACE20-MIB

Category: ATM

Description: Manages the Nortel ACE 20 ATM access concentrator, providing configuration and status objects for ATM virtual circuits and interfaces.

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What Is ACE20-MIB?

ACE20-MIB is a vendor-specific SNMP module for the Nortel (originally ACE, later Nortel-branded) ACE 20 ATM access concentrator, providing configuration and status objects for ATM virtual circuits, switch interfaces, and system-level events. It exposes both configuration data (such as switch software version/switchover commands) and operational status data, including an alarm history table recording past alarm conditions with timestamps and affected VPI/VCI values. Its monitoring value spans both software status (switch operational state, software version/switchover) and fault history — the alarm table is effectively a device event/fault log usable for diagnosing hardware or link problems on ATM ports. It is a self-contained proprietary MIB built around the ATM Forum's VPI/VCI addressing concepts rather than a direct extension of a standard IETF MIB. It is deployed in ATM access networks where an ACE 20 concentrator aggregates ATM virtual circuits from multiple sources. Engineers can download the ACE20-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in ACE20-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

  • Nortel/ACE 20 ATM access concentrator

Monitoring Examples

The sample objects show atmSuSystemSwOperStatus and atmSuSystemSwSwitchVersionsCmd for switch software state, plus an atmSuSystemHistoryAlrTable/atmSuSystemHistoryAlrEntry keyed by atmSuSystemHistoryAlrIndex with fields like atmSuSystemHistoryAlrIfIndex, atmSuSystemHistoryAlrDescription, atmSuSystemHistoryAlrStatus, atmSuSystemHistoryAlrOccurrenceTime, atmSuSystemHistoryAlrVpi, and atmSuSystemHistoryAlrVci. An administrator would poll atmSuSystemSwOperStatus to confirm the switch software is running normally, and review the alarm history table to correlate a specific VPI/VCI's past alarm occurrences with reported ATM circuit outages. This alarm table is the primary fault-diagnosis resource in this MIB.

What Can Be Monitored

  • switch software operational status
  • software version/switchover state
  • alarm history log
  • affected interface (ifIndex)
  • VPI/VCI of alarmed circuit
  • alarm occurrence timestamp
Imported Objects

From ATM-MIB

AtmTrafficDescrParamIndex

From IF-MIB

ifAliasOBJECT-TYPE

From RAD-MIB

TimeSlots
agnIndicationOBJECT-TYPE
agnLedOBJECT-TYPE
alarmSeverityOBJECT-TYPE
alarmStateOBJECT-TYPE
radAtmOBJECT-IDENTITY

From RFC1155-SMI

IpAddress
OBJECT-TYPE

From SNMPv2-SMI

Counter32
Integer32
NOTIFICATION-TYPE
OBJECT-IDENTITY

From SNMPv2-TC

DisplayString
MacAddress
RowStatus
TEXTUAL-CONVENTION
TimeStamp

How to Use in IPNetwork Monitor

Example using atmSuPortAtmRxClp0Cells OID:

Select a Nortel ACE 20 ATM concentrator (legacy) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type atmSuPortAtmRxClp0Cells into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The number of cells received with correct HECs and CLP=0 and not misrouted. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

Manages RAD ACE20 ATM service unit including system software management and alarm configuration.

Start monitoring Nortel ACE 20 ATM concentrator (legacy) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download ACE20-MIB