COM21-HCXTX-MIB

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Organization: Com21, Inc.

Last Updated: 1997-01-08

Category: DOCSIS and Cable

Description: Monitors upstream transmit channel parameters and power levels on COM21 HCX cable equipment.

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What Is COM21-HCXTX-MIB?

COM21-HCXTX-MIB is a private MIB from COM21, a cable broadband equipment vendor, defining objects for the transmit (TX) unit of the COM21 HCX ComController cable modem termination equipment used in HFC (hybrid fiber-coax) cable networks. It exposes configuration and status data for the upstream transmit channel, including parameters like channel frequency, modulation, and transmit power level. For hardware/software status monitoring it is primarily used to verify upstream RF transmit health — confirming transmit power levels and channel settings are within expected range, which directly affects whether cable modems can successfully communicate upstream to the headend equipment. It is a narrowly scoped, self-contained hardware-control MIB specific to the COM21 ComController TX unit, though it operates alongside the broader DOCSIS cable-modem MIB ecosystem used elsewhere in the plant. It is deployed in cable headends on COM21 ComController equipment as part of legacy DOCSIS/HFC broadband access networks, and technicians can consult the COM21-HCXTX-MIB MIB when diagnosing upstream transmit issues.

IPNetwork Monitor allows you to monitor SNMP objects defined in COM21-HCXTX-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 HCX ComController cable headend equipment

Monitoring Examples

No sample objects were supplied for this MIB, so specific object names cannot be confirmed. In general, a headend technician would poll the TX unit's upstream channel power level and frequency settings to detect a transmit power drift or misconfigured channel that would explain cable modems in that segment losing upstream connectivity. Without concrete object names here, a more detailed grounded example cannot be honestly given.

What Can Be Monitored

upstream transmit channel power level
channel frequency/modulation settings

Imported Objects

From COM21-HCX-MIB

com21	OBJECT-IDENTITY
com21Hcx	OBJECT-IDENTITY
com21Traps	OBJECT-IDENTITY

From COM21-HCXALM-MIB

hcxAlmSeverity	OBJECT-TYPE
hcxEventLogTime	OBJECT-TYPE

From SNMPv2-SMI

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

From SNMPv2-TC

DisplayString
MacAddress

How to Use in IPNetwork Monitor

Example using hcxStatsCurrMinTxCells OID:

Select a Com21 ComController HCX upstream TX unit (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 hcxStatsCurrMinTxCells into the Find box to locate it in the OID tree, then select it and click OK. Represents the number of cells transmitted 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

OID symbolic	OID numeric	Type	Access	Description
com21HcxTx	1.3.6.1.4.1.1141.2.20			This is the Com21 ComController TX Unit Control MIB module. COM21 Part# 005-0025-00
com21HcxDnstrmPortGroup	1.3.6.1.4.1.1141.2.21
I32 hcxDownstreamPortId	1.3.6.1.4.1.1141.2.21.1	Integer32	read-only	contains downstream port id. Initially at least, only 1 supported.
INT hcxXmitFrequency	1.3.6.1.4.1.1141.2.21.2	INTEGER	read-write	Contains the transmit frequency of the RF port in KHz. If this value is changed AFTER the acquisition of ComPorts then a corresponding change to the stuXmitFrequency attribute shall be broadcast to all the acquired ComPorts. Minimum step size is 200. i.e. 200000hz. Default is 0.
INT hcxXmitGain	1.3.6.1.4.1.1141.2.21.3	INTEGER	read-write	Transmit gain is used to specify the power level in the ComController transmitter. Default is 0.
com21HcxDnstrmStatsGroup	1.3.6.1.4.1.1141.2.22
G32 hcxStatsCurrMinTxCellsEx	1.3.6.1.4.1.1141.2.22.1	Gauge32	read-only	Represents the number of cells transmitted in the current 15 minute period.
G32 hcxStatsCurrMinTxNullCells	1.3.6.1.4.1.1141.2.22.2	Gauge32	read-only	Represents the number of null cells transmitted in the current 15 minute period.
G32 hcxStatsPrevMinTxCells	1.3.6.1.4.1.1141.2.22.3	Gauge32	read-only	Represents the number of cells transmitted in the previous 15 minute period.
G32 hcxStatsPrevMinTxNullCells	1.3.6.1.4.1.1141.2.22.4	Gauge32	read-only	Represents the number of null cells transmitted in the previous 15 minute period.
G32 hcxDownstreamUtil	1.3.6.1.4.1.1141.2.22.5	Gauge32	read-only	Represents the percentage of utilization on the downstream channel - the RF TX will stuff with null cells to match line rate. i.e. traffic cells/(traffic cells + null cells) * 100. This figure is updated every second.
INT hcxStatsClearTxCurrStats	1.3.6.1.4.1.1141.2.22.6	INTEGER	read-write	This attribute is used to clear current TX statistics counters in this group. This operation is only possible if the hcxStatsControl attribute is set to wrapCurr.
com21HcxDnstrmUnitGroup	1.3.6.1.4.1.1141.2.23
INT hcxDownstreamShelfId	1.3.6.1.4.1.1141.2.23.1	INTEGER	read-only	contains the associated shelf id.
I32 hcxDownstreamSlotId	1.3.6.1.4.1.1141.2.23.2	Integer32	read-only	contains downstream slot id.
STR hcxDownstreamHardwareVersion	1.3.6.1.4.1.1141.2.23.3	DisplayString	read-only	contains the hardware version of the TX card. An empty string if card not present.
STR hcxDownstreamBootVersion	1.3.6.1.4.1.1141.2.23.4	DisplayString	read-only	contains the version of the TX card boot ROM. An empty string if card not present.
PRI hcxDnstreamUnitPrimServState	1.3.6.1.4.1.1141.2.23.5	PrimServiceState	read-only	contains primary service state of the Downstream Unit.
STR hcxDnstreamUnitSecServState	1.3.6.1.4.1.1141.2.23.6	DisplayString	read-only	contains a string defining the secondary service states of the Downstream Unit. The substrings supported by the Downstream Unit shall be: TEST - in test, as set by hcxDnUnitConfigState, STBY - standby, again set by hcxDnUnitConfigState, MT - maintenance, set by hcxDnUnitConfigState, FAULT - hardware failure, UNEQ - unequipped.
INT hcxDnUnitConfigState	1.3.6.1.4.1.1141.2.23.7	INTEGER	read-write	The Downstream Unit State is an active-value. Note that because we have only one port per card then this state change is exactly the same as hcxDnstrmPortState. Note that initially standby will be the same state as offline. Later this will change when TX redundancy is supported. offline is default.
INT hcxDnUnitRestartAction	1.3.6.1.4.1.1141.2.23.8	INTEGER	read-write	The TX Unit Action is an active-value. The setting of this attibute to restart(2) causes the TX card to reset and download a new image.
INT hcxDnDiagTestAction	1.3.6.1.4.1.1141.2.23.9	INTEGER	read-write	This attribute is used to invoke the internal TX diagnostic test. In order to activate this test, the card must be placed in the test state.
INT hcxDnDiagTestResult	1.3.6.1.4.1.1141.2.23.10	INTEGER	read-only	This attribute contains the result of the last TX diagnostic test. Details TBD.
INT hcxDnTestStatusLed	1.3.6.1.4.1.1141.2.23.11	INTEGER	read-only	The TX Test Status LED is a read-only attribute which describes the condition of the TX Test Status light emitting diode located on the RX board. A value of on(1) indicates that a service effecting test is in progress and that the LED is illuminated. off if card not present.
INT hcxDnFaultStatusLed	1.3.6.1.4.1.1141.2.23.12	INTEGER	read-only	The RX Fault Status LED is a read-only attribute which describes the condition of the TX Fault Status light emitting diode located on the TX board. A value of on(1) indicates that an fault condition has been detected (for which a trap will have been issued) and the LED is illuminated. off if card not present.
STR hcxDownstreamSerialNumber	1.3.6.1.4.1.1141.2.23.13	DisplayString	read-only	contains the serial number of the TX card. An empty string if card not present.
NTF hcxDnstrmUnitPrimStateChange	1.3.6.1.4.1.1141.4.60			Generated whenever a the hcxDnstreamUnitPrimServState changes in value. This an event with no clear condition. Only severity is WARNING.
NTF hcxDnstrmUnitSecStateChange	1.3.6.1.4.1.1141.4.61			Generated whenever a the hcxDnstreamUnitSecServState changes in value. This an event with no clear condition. Only severity is WARNING.
NTF hcxDnDiagTestComplete	1.3.6.1.4.1.1141.4.62			This notification is generated whenever the TX internal diagnostic tests are completed. This an event with no clear condition. Only severity is WARNING.
NTF hcxDnTestStatusLedChange	1.3.6.1.4.1.1141.4.63			generated whenever there is a change in test LED status. This an event with no clear condition. Only severity is WARNING.
NTF hcxDnFaultStatusLedChange	1.3.6.1.4.1.1141.4.64			generated whenever there is a change in the Fault LED status. This an event with no clear condition. Only severity is WARNING.
NTF hcxDnOperationFailure	1.3.6.1.4.1.1141.4.65			This notification is generated by the CC whenever a TX card fails to respond correctly to a request. This failure could indicate either a resource problem or software failure. Note that if a TX card failures to respond completely to a CC request, then a hcxInsertChange trap shall be generated. This is an event with no clear condition. Only severity is WARNING.
NTF hcxSynthLockLossDetected	1.3.6.1.4.1.1141.4.68			Default severity is MINOR.
NTF hcxSynthLockLossClear	1.3.6.1.4.1.1141.4.69			Severity is CLEARED.
NTF hcxLossOfFrameClkDetected	1.3.6.1.4.1.1141.4.70			Default severity is MINOR.
NTF hcxLossOfFrameClkClear	1.3.6.1.4.1.1141.4.71			Severity is CLEARED.

RFC description

Manages the Com21 ComController TX Unit, providing monitoring and control of RF transmitter cards and downstream RF ports.

Start monitoring Com21 ComController HCX upstream TX unit (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.

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