DOCS-IF-M-CMTS-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

All MIBs › DOCS-IF-M-CMTS-MIB

Organization: Cable Television Laboratories, Inc

Last Updated: 2005-11-16

Category: Domain: CATV/Cable, Standard: DOCSIS

Description: Manages Modular CMTS (M-CMTS) architecture components for scalable DOCSIS cable network headends.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) 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.

What Is DOCS-IF-M-CMTS-MIB?

DOCS-IF-M-CMTS-MIB is a CableLabs standards-track MIB that models the Modular CMTS (M-CMTS) architecture, in which downstream RF generation is split out of the CMTS core into external EQAM (Edgeqam) devices connected via the Downstream External PHY Interface (DEPI). It exposes core/EQAM topology through docsIfMCmtsCoreDownstreamTable and docsIfMCmtsEqamDownstreamTable/docsIfMCmtsEqamDownstreamCapabilitiesTable, channel-to-EQAM-port grouping through docsIfMCmtsChannelBlockTable and docsIfMCmtsEqamGroupDependencyTable, and DEPI tunnel/session management through docsIfMCmtsDepiSessionConfigTable, docsIfMCmtsDepiSessionInfoTable, and docsIfMCmtsDepiRsrcAllocTable, with per-session performance visible in docsIfMCmtsDepiSessionStatsTable and docsIfMCmtsDepiSessionCinLatencyPerfTable. It depends on ENTITY-MIB for physical inventory correlation, DOCS-IF-MIB and DOCS-QOS-MIB for the base DOCSIS RF and QoS objects it extends, and IF-MIB for interface indexing. It is deployed on cable operators' M-CMTS headend equipment (CMTS core plus EQAM devices) in scalable DOCSIS cable network deployments, and engineers researching this architecture consult the DOCS-IF-M-CMTS-MIB reference to understand the DEPI session model.

IPNetwork Monitor allows you to monitor SNMP objects defined in DOCS-IF-M-CMTS-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

  • vendor-neutral, standards-based MIB (CableLabs M-CMTS specification), not tied to a specific manufacturer — applies to CMTS core and EQAM devices in Modular CMTS deployments

Monitoring Examples

An operator polls docsIfMCmtsDepiSessionInfoTable and docsIfMCmtsDepiSessionStatsTable for a given DEPI session to confirm it is established and check its packet/latency performance, then cross-references docsIfMCmtsEqamDownstreamTable to identify the EQAM downstream channel it maps to; a session missing from the info table, or elevated latency in docsIfMCmtsDepiSessionCinLatencyPerfTable, would indicate a broken or degraded core-to-EQAM tunnel affecting downstream service.

What Can Be Monitored

  • core-to-EQAM downstream channel mapping tables
  • EQAM downstream capabilities
  • DEPI session configuration and state
  • DEPI resource allocation table
  • per-session DEPI statistics and latency performance
  • QoS service flow extension objects
Imported Objects

From CLAB-DEF-MIB

clabProjDocsisOBJECT-IDENTITY

From DOCS-IF-MIB

TenthdBmV

From DOCS-QOS-MIB

docsQosServiceFlowIdOBJECT-TYPE

From ENTITY-MIB

PhysicalIndex
PhysicalIndexOrZero
entPhysicalAliasOBJECT-TYPE
entPhysicalAssetIDOBJECT-TYPE
entPhysicalClassOBJECT-TYPE
entPhysicalSerialNumOBJECT-TYPE
entityGeneralGroupOBJECT-GROUP
entityLogical2GroupOBJECT-GROUP
entityMappingGroupOBJECT-GROUP
entityPhysical2GroupOBJECT-GROUP
entityPhysical3GroupOBJECT-GROUP
entityPhysicalGroupOBJECT-GROUP

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero
ifIndexOBJECT-TYPE

From INET-ADDRESS-MIB

InetAddress
InetAddressType
InetPortNumber

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMP-TARGET-MIB

SnmpTagValue

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
Integer32
MODULE-IDENTITY
OBJECT-IDENTITY
OBJECT-TYPE
TimeTicks
Unsigned32

From SNMPv2-TC

AutonomousType
RowStatus
StorageType
TimeStamp
TruthValue

How to Use in IPNetwork Monitor

Example using docsIfMCmtsDepiSessionInfoOutOfSequencePkts OID:

Select an M-CMTS core + EQAM device (Modular CMTS DEPI, vendor-neutral CableLabs standard) 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 docsIfMCmtsDepiSessionInfoOutOfSequencePkts 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 count of DEPI session packets out of sequence. 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 between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

DOCSIS If CMTS MIB (RFC 4639) defining DOCSIS Cable Modem Termination System interface management objects for CMTS equipment in cable networks.

Start monitoring M-CMTS core + EQAM device (Modular CMTS DEPI, vendor-neutral CableLabs standard) 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 DOCS-IF-M-CMTS-MIB