COM21-HCXOC3-MIB

MIB Reference — IPNetwork Monitor · Updated September 14, 2026

All MIBsCOM21-HCXOC3-MIB

Organization: Com21, Inc.

Last Updated: 1997-01-08

Category: DOCSIS and Cable

Description: Manages OC-3 ATM uplink interface parameters on COM21 HCX cable concentrator systems.

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What Is COM21-HCXOC3-MIB?

COM21-HCXOC3-MIB is a vendor-specific SNMP module from COM21 (part number 005-0025-00) for the OC-3 ATM uplink card in the ComController HCX broadband cable concentrator platform, a DOCSIS-era cable headend system. As an interface-level MIB it is expected to expose configuration and status data for the OC-3 ATM uplink, such as line status, cell counts, and alarm/error indicators typical of SONET/ATM interface MIBs. Its monitoring role is centered on hardware/link status: tracking whether the OC-3 physical uplink is up, detecting loss-of-signal or framing errors, and watching ATM cell-level statistics that indicate uplink health for the cable headend. It likely depends on or parallels standard ATM/SONET interface MIBs (e.g. atmMIB, sonetMIB) given the OC-3/ATM subject matter, layered under the vendor's proprietary tree. The COM21-HCXOC3-MIB MIB is typically deployed in legacy cable-modem headend environments where the HCX concentrator aggregates subscriber traffic onto an OC-3 ATM backbone uplink.

IPNetwork Monitor allows you to monitor SNMP objects defined in COM21-HCXOC3-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

  • COM21 ComController HCX cable concentrator (OC-3 ATM uplink card)

Monitoring Examples

No sample runtime objects were available for this module in the supplied source excerpt, so specific object names cannot be grounded here; in practice an administrator managing this uplink card would expect to poll OC-3 line status and ATM cell error/alarm counters analogous to standard ATM interface MIB objects to detect a failed or degraded uplink between the HCX concentrator and the ATM backbone.

What Can Be Monitored

  • OC-3 uplink line status
  • ATM cell error/alarm counts
  • uplink alarm indicators
Imported Objects

From COM21-HCX-MIB

com21OBJECT-IDENTITY
com21HcxOBJECT-IDENTITY
com21TrapsOBJECT-IDENTITY

From COM21-HCXALM-MIB

hcxAlmSeverityOBJECT-TYPE
hcxEventLogTimeOBJECT-TYPE

From SNMPv2-SMI

Gauge32
Integer32
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

DisplayString
MacAddress
OIDs

RFC description

Com21 vendor MIB for managing high-capacity OC-3 optical interfaces on cable modem and broadband access equipment.

Start monitoring Com21 ComController HCX OC-3 ATM uplink card (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 COM21-HCXOC3-MIB