COM21-HCXRX-MIB

MIB Reference — IPNetwork Monitor · Updated September 14, 2026

All MIBsCOM21-HCXRX-MIB

Organization: Com21, Inc.

Last Updated: 1997-01-08

Category: DOCSIS and Cable

Description: Monitors downstream receive channel parameters for COM21 HCX cable modem equipment.

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What Is COM21-HCXRX-MIB?

This is a private-enterprise MIB from COM21 for the ComController RX (downstream receive) card used in their HCX-series hybrid fiber-coax (HFC) cable broadband access equipment. It exposes card-level configuration and status data for the downstream receive path, such as channel frequency, modulation, and signal-level parameters on the headend RX card. Because it targets a specific receive card, it is primarily used to monitor the hardware health of that card - whether it is present and operating normally, and the quality of the incoming downstream RF signal it is receiving - functioning as a hardware/signal-status indicator for the ComController chassis. It is one part of a larger family of COM21 ComController MIBs (unit-control, topology, VLAN, etc.) and likely relies on those companion modules and standard interface conventions for full-unit context. It would typically be deployed by a cable operator's network operations center to monitor headend equipment in an HFC access network. Engineers can download the COM21-HCXRX-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in COM21-HCXRX-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 headend unit
  • cable/HFC broadband access equipment

Monitoring Examples

The sample_objects list supplied for this MIB was empty, so no exact object or table names can be cited here. In practice this module would expose per-card receive-channel objects (frequency, signal level, lock/status) on the ComController RX card, which an operator would poll to detect a degraded or lost downstream signal on a given card slot. This should be treated as a general characterization based on the module description rather than a citation of confirmed OIDs.

What Can Be Monitored

  • RX card operational status
  • downstream receive signal level
  • channel frequency/modulation settings
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

From SNMPv2-TC

DisplayString
MacAddress

How to Use in IPNetwork Monitor

Example using hcxPortCurrMinRxCells OID:

Select a Com21 ComController HCX downstream RX card (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 hcxPortCurrMinRxCells 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. Represents the number of cells received in the current 15 minute period. 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 Gauge32-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

Com21 ComController RX card MIB for managing upstream RF receive functionality. Monitors RF signal characteristics, statistics, and ILMI-related objects.

Start monitoring Com21 ComController HCX downstream RX 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-HCXRX-MIB