SCTE-HMS-QAM-MIB

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Category: SCTE HMS Cable Headend

Description: Manages SCTE HMS headend QAM modulator channel frequency, symbol rate, and output power.

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What Is SCTE-HMS-QAM-MIB?

SCTE-HMS-QAM-MIB is part of the SCTE (Society of Cable Telecommunications Engineers) Hardware Management System (HMS) family of vendor-neutral standard MIBs used in cable headend equipment, specifically for QAM (Quadrature Amplitude Modulation) modulators that convert digital video/data into RF signals for delivery over HFC networks. It exposes a per-channel configuration and status table indexed by ifIndex, covering RF frequency, modulation format, symbol/interleaver settings, output power, and annex/downstream mode. It is used heavily for hardware/RF status monitoring: administrators track qamChannelPower and qamChannelFrequency to confirm each QAM channel is transmitting at the correct output level and frequency, and qamChannelSquelch/qamChannelContWaveMode to check muting/carrier states — all hardware-facing indicators of headend transmission health. As an SCTE HMS MIB it is designed to work alongside the broader HMS MIB suite and standard IF-MIB ifTable indexing. It is deployed in cable headend/hub QAM modulator chassis by MSOs (cable operators) to remotely monitor and configure video/data RF output. Engineers implementing or auditing this functionality typically reference the SCTE-HMS-QAM-MIB RFC/standard documentation for the authoritative specification.

IPNetwork Monitor allows you to monitor SNMP objects defined in SCTE-HMS-QAM-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

cable headend QAM modulator (vendor-neutral SCTE HMS standard, used across HMS-compliant headend hardware)

Monitoring Examples

A cable headend NMS would walk qamChannelTable/qamChannelEntry per ifIndex to read qamChannelFrequency, qamChannelModulationFormat, and qamChannelPower for each RF channel on a QAM modulator; a channel reporting a power level below its configured setpoint or an unexpected qamChannelSquelch state indicates an RF output fault. qamChannelInterleaverLevel/qamChannelInterleaverMode and qamChannelAnnexMode confirm the channel is provisioned for the correct downstream standard. The qamChannelCommonTable/qamChannelCommonEntry rows expose device-wide QAM settings shared across channels for cross-checking chassis-level configuration.

What Can Be Monitored

QAM channel RF frequency
output power
modulation format
interleaver settings
squelch/carrier state
annex/downstream mode

Imported Objects

From ENTITY-MIB

entPhysicalIndex

OBJECT-TYPE

From IF-MIB

ifIndex

OBJECT-TYPE

From INET-ADDRESS-MIB

InetAddress
InetAddressType

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Gauge

From SCTE-HMS-HEADENDIDENT-TC-MIB

QAMChannelInterleaveMode
QAMChannelModulationFormat

From SNMPv2-SMI-v1

enterprises

OBJECT-IDENTITY

OIDs

OID symbolic	OID numeric	Type	Access	Description
heDigitalQamMIB	1.3.6.1.4.1.5591.1.11.5.3.1
qamMIBObjects	1.3.6.1.4.1.5591.1.11.5.3.1.1
qamChannelTable	1.3.6.1.4.1.5591.1.11.5.3.1.1.1		not-accessible	This table describes the configuration and attributes of each QAM channel of the QAM designated by ifIndex.
qamChannelEntry	1.3.6.1.4.1.5591.1.11.5.3.1.1.1.1		not-accessible	There is an entry in the table for each QAM channel. The index to this table is the ifIndex of each QAM channel.
GAU qamChannelFrequency	1.3.6.1.4.1.5591.1.11.5.3.1.1.1.1.1	Gauge	read-only	The center frequency of the QAM channel.
QAM qamChannelModulationFormat	1.3.6.1.4.1.5591.1.11.5.3.1.1.1.1.2	QAMChannelModulationFormat	read-only	RF Modululation for this output QAM channel when qamChannelContWaveMode is off.
INT qamChannelInterleaverLevel	1.3.6.1.4.1.5591.1.11.5.3.1.1.1.1.3	INTEGER	read-only	The interleaver level for FEC coding. level1 - implies interleaver level 1 level2 - implies interleaver level 2 This object is only valid when AnnexMode has the value annexB.
NUM qamChannelInterleaverMode	1.3.6.1.4.1.5591.1.11.5.3.1.1.1.1.4	QAMChannelInterleaveMode	read-only	The interleaving depth or operation mode of the interleaver. 'taps8Increment16': protection 5.9/4.1 usec, latency .22/.15 msec 'taps16Increment8': protection 12/8.2 usec, latency .48/.33 msec 'taps32Increment4': protection 24/16 usec, latency .98/.68 msec 'taps64Increment2': protection 47/33 usec, latency 2/1.4 msec 'taps128Increment1': protection 95/66 usec, latency 4/2.8 msec 'taps12increment17': protection 18/14 usec, latency 0.43/0.32 msec 'taps128increment2': protection 190/132 usec, latency 8/5.6 msec 'taps128increment3': protection 285/198 usec, latency 12/8.4 msec 'taps128increment4': protection 380/264 usec, latency 16/11 msec 'taps128increment5': protection 475/330 usec, latency 20/14 msec 'taps128increment6': protection 570/396 usec, latency 24/17 msec 'taps128increment7: protection 664/462 usec, latency 28/20 msec 'taps128increment8': protection 759/528 usec, latency 32/22 msec The value 'taps12increment17' is supported by EuroDOCSIS cable systems only, and the others by DOCSIS cable systems. If the QAM chammel interface is down, this object either returns the configured value, or the value of 'unknown'. The value of 'other' is returned if the interleave is known but not defined in the above list. When the qamChannelInterleaverLevel is set to 'level 1', a single interleaving depth is supported, namely 'taps128Increment1'. When the qamChannelInterleaverLevel is set to 'level2', all the other interleaving depths are also supported.
INT qamChannelPower	1.3.6.1.4.1.5591.1.11.5.3.1.1.1.1.5	INTEGER	read-only	The output power of the QAM channel. If the QAM channel is muted, value is not valid.
INT qamChannelSquelch	1.3.6.1.4.1.5591.1.11.5.3.1.1.1.1.6	INTEGER	read-only	Indicates whether the QAM port is muted or not.
INT qamChannelContWaveMode	1.3.6.1.4.1.5591.1.11.5.3.1.1.1.1.7	INTEGER	read-only	Indicates whether Continuous Wave mode is enabled or not for output.
INT qamChannelAnnexMode	1.3.6.1.4.1.5591.1.11.5.3.1.1.1.1.8	INTEGER	read-only	Specifies the ITU-T standard supported by the QAM channel annexA - standard specified by Annex A of ITU-T J.83 annexB - standard specified by Annex B of ITU-T J.83 annexC - standard specified by Annex C of ITU-T J.83 Other - other standard that may apply.
qamChannelCommonTable	1.3.6.1.4.1.5591.1.11.5.3.1.1.2		not-accessible	This table decribes MPEG and DOCSIS characteristics that are not part of the DOCSIS-IF-MIB.
qamChannelCommonEntry	1.3.6.1.4.1.5591.1.11.5.3.1.1.2.1		not-accessible	Each entry of this table describes attributes of an RF channel for both MPEG and DOCSIS QAMs.
INT qamChannelCommonOutputBw	1.3.6.1.4.1.5591.1.11.5.3.1.1.2.1.1	INTEGER	read-only	The QAM channel output bandwidth or capacity.
INT qamChannelCommonUtilization	1.3.6.1.4.1.5591.1.11.5.3.1.1.2.1.2	INTEGER	read-only	The utilization of the QAM channel in 0.1 percentage. This rate may be calculated as transport stream packets / ( transport stream packets + null packets ). If not applicable, a value of -1 is returned.
qamConfigTable	1.3.6.1.4.1.5591.1.11.5.3.1.1.3		not-accessible	This table is designed to show the IP addresses configuration for the QAM channels, optionally UDP port range, Program Number range associated with QAM channels. Configuring these parameters is necessary when performing session-based provisioning. A session-based provisioning request must conform to the configurations in this table. The QAM channels within an QAM device may be partitioned to support multiple UDP, QAM or ProgramNo ranges. Though it's helpful to partition the QAM channels when the total number of QAM channel increases, this is not a must. This table may also be used to show the reserved UDP ports, or program numbers for special purposes instead of using default ones allowed by hardware, software, or MPEG protocol.
qamConfigEntry	1.3.6.1.4.1.5591.1.11.5.3.1.1.3.1		not-accessible	Each entry corresponds to the configuration of a QAM channel range.
GAU qamConfigIndex	1.3.6.1.4.1.5591.1.11.5.3.1.1.3.1.1	Gauge	not-accessible	The table index.
INT qamConfigQamChannelIdMin	1.3.6.1.4.1.5591.1.11.5.3.1.1.3.1.2	INTEGER	read-only	QAMChannelId maybe within a line card or global depending on entPhysicalIndex.
INT qamConfigQamChannelIdMax	1.3.6.1.4.1.5591.1.11.5.3.1.1.3.1.3	INTEGER	read-only	QAMChannelId maybe within a line card or global depending on entPhysicalIndex.
IPt qamConfigIPAddrType	1.3.6.1.4.1.5591.1.11.5.3.1.1.3.1.4	InetAddressType	read-only	The type of the program destination address as defined by inetAddressType. The default value is 1 for ipv4(1)
IP qamConfigIPAddr	1.3.6.1.4.1.5591.1.11.5.3.1.1.3.1.5	InetAddress	read-only	IP address of the QAM channel.
INT qamConfigUdpPortRangeMin	1.3.6.1.4.1.5591.1.11.5.3.1.1.3.1.6	INTEGER	read-only	The lowest UDP port of the UDP port range that can be used on this QAM channel.
INT qamConfigUdpPortRangeMax	1.3.6.1.4.1.5591.1.11.5.3.1.1.3.1.7	INTEGER	read-only	The highest UDP port of the UDP port range that can be used on this QAM channel.
INT qamConfigOutputProgNoMin	1.3.6.1.4.1.5591.1.11.5.3.1.1.3.1.8	INTEGER	read-only	The lowest MPEG output program number that can be used on the QAM channel.
INT qamConfigOutputProgNoMax	1.3.6.1.4.1.5591.1.11.5.3.1.1.3.1.9	INTEGER	read-only	The highest MPEG output program number that can be used on the QAM channel.
qamMIBConformance	1.3.6.1.4.1.5591.1.11.5.3.1.2
qamMIBCompliances	1.3.6.1.4.1.5591.1.11.5.3.1.2.1
qamSupport	1.3.6.1.4.1.5591.1.11.5.3.1.2.1.1
docsisSupport	1.3.6.1.4.1.5591.1.11.5.3.1.2.1.2
qamMIBGroups	1.3.6.1.4.1.5591.1.11.5.3.1.2.2
qamMpegDocsisCommonGroup	1.3.6.1.4.1.5591.1.11.5.3.1.2.2.1
qamChannelGroup	1.3.6.1.4.1.5591.1.11.5.3.1.2.2.2
qamConfigGroup	1.3.6.1.4.1.5591.1.11.5.3.1.2.2.3

RFC description

ANSI/SCTE 154-2 standard MIB for managing QAM edge equipment in cable television headends; defines objects for QAM channel configuration.

Start monitoring cable headend QAM modulator, vendor-neutral SCTE HMS standard (per-channel RF frequency/power 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.

Download SCTE-HMS-QAM-MIB

What Is SCTE-HMS-QAM-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description