ARRIS-CMTS-FFT-MIB

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Organization: Arris International

Last Updated: 2014-08-12

Category: DOCSIS and Cable, Vendor: ARRIS

Description: ARRIS CMTS FFT spectrum analysis tool for upstream channel noise and ingress diagnostics.

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What Is ARRIS-CMTS-FFT-MIB?

This is an ARRIS enterprise MIB for managing the FFT (Fast Fourier Transform) spectrum-analysis diagnostic tool built into ARRIS CMTS (Cable Modem Termination System) platforms, used for DOCSIS upstream channel diagnostics. It is intended to expose objects for configuring and retrieving FFT capture jobs/results, letting an operator run spectral captures on upstream RF channels to visualize noise and ingress across frequency. It supports monitoring the hardware/RF-plant health of the CMTS's upstream receive path; spectral captures reveal ingress noise, interference, and impairments on the coax plant that would otherwise show up only indirectly as elevated modem error/retry rates, making it a hardware-level signal-quality diagnostic tool rather than a general-purpose performance counter set. It operates within ARRIS's broader CMTS MIB family and DOCSIS-related standards context, though no specific dependency is stated in the available metadata. It is deployed on ARRIS CMTS headend equipment in cable operator networks, used by RF engineers to diagnose upstream noise/ingress problems affecting cable modem service quality. Network engineers evaluating or troubleshooting this functionality can download the ARRIS-CMTS-FFT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in ARRIS-CMTS-FFT-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

ARRIS CMTS (Cable Modem Termination System)

Monitoring Examples

No sample object names were provided for this MIB, so specific table/object-level detail cannot be given honestly; based on its description it manages FFT spectral-capture jobs for upstream channel diagnostics on the ARRIS CMTS, but concrete object identifiers are not confirmed here.

Imported Objects

From ARRIS-MIB

cmtsCommon

OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Integer32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32
enterprises

From SNMPv2-TC

TEXTUAL-CONVENTION
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
cmtsFftMIB	1.3.6.1.4.1.4115.1.4.5.1			This MIB manages the FFT software on the Arris CMTS
dcxFftObjects	1.3.6.1.4.1.4115.1.4.5.1.1
dcxFftUpstreamChannelTable	1.3.6.1.4.1.4115.1.4.5.1.1.1		not-accessible	Arris CMTS FFT upstream channel configuration table. An entry in this table exists for each ifEntry with an ifType of docsCableUpstreamInterface (129) that supports FFT collection and reporting.
dcxFftUpstreamChannelEntry	1.3.6.1.4.1.4115.1.4.5.1.1.1.1		not-accessible	Arris FFT upstream channel entry.
U32 dcxFftSize	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.1	Unsigned32	read-write	Number of samples to be collected for FFT. Valid values are 256, 512, 1024, 2048, 4096. The FFT payload size will be the number of samples multiplied by the number of bytes per sample as determined by dcxFftOutputFormat. The duration of the FFT sample will be the number of samples divided by the sample rate as determined by dcxFftSampleRate.
INT dcxFftSampleRate	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.2	INTEGER	read-write	FFT sample rate based on the input source to the FFT. The input to the FFT can be the ADC output, the ADC output followed by a down-mixer and half-band filter, the ADC output followed by a down-mixer and quarter-band filter, or the received channel's Nyquist filter output.
I32 dcxFftCentreFrequency	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.3	Integer32	read-write	FFT centre frequency. This object is used only if dcxFftSampleRate is set to halfAdcRate or quarterAdcRate to set the down-mixer frequency.
INT dcxFftWindowing	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.4	INTEGER	read-write	Set the frequency-domain windowing filter.
U32 dcxFftLogAveragingTimeConstant	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.5	Unsigned32	read-write	Time averaging constant exponent, M. Constant is 2^M. Setting this object to zero disables averaging.
INT dcxFftOutputFormat	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.6	INTEGER	read-write	FFT processor output format. Format can be i. raw complex time-domain I/Q format ii. FFT data in I/Q format iii. FFT data in power format iv. FFT data in amplitude format. The sample sizes are 4 bytes (i. - iii.) and 2 bytes (iv.)
INT dcxFftOperatingMode	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.7	INTEGER	read-write	Operating mode of FFT process. Determines whether the FFT measurement takes place while no CMs are transmitting (measuring noise floor), during a CM burst, or by periodically sampling the spectrum without regard to scheduling of the upstream.
U32 dcxFftIdleInterval	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.8	Unsigned32	read-write	Interval in microseconds between consecutive FFT triggers when dcxFftOperatingMode is baseSpectrum or periodicSpectrum. This object is not used if dcxFftOperatingMode is set to burstSpectrum or if dcxFftTriggerCount is 1.
U32 dcxFftBurstSid	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.9	Unsigned32	read-write	SID on which to trigger the FFT process. This object is used only if dcxFftOperatingMode is set to burstSpectrum.
INT dcxFftBurstIUC	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.10	INTEGER	read-write	IUC type on which to trigger the FFT process. This object is used only if dcxFftOperatingMode is set to burstSpectrum or periodicSpectrum. A value of 0 means trigger on any IUC type.
INT dcxFftLogicalChannel	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.11	INTEGER	read-write	Logical channel on which to trigger the FFT process. This object is used only if dcxFftOperatingMode is set to periodicSpectrum. A value of -1 means trigger on any logical channel.
U32 dcxFftTriggerCount	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.12	Unsigned32	read-write	Number of times to trigger FFT when dcxFftEnable and dcxFftApplyConfig are set to true. Set this object to zero to trigger FFT continuously.
T/F dcxFftEnable	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.13	TruthValue	read-write	Set to true to enable FFT on this channel. Set to false to disable. Setting will take effect when dcxFftApplyConfig is set to true
T/F dcxFftApplyConfig	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.14	TruthValue	read-write	Set to true to trigger an FFT process with configuration determined by the other objects in this group. An SNMP GET of this object will always return false
T/F dcxFftInProgress	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.15	TruthValue	read-only	This object will return true if an FFT process is currently in progress (having been started by a SET to dcxFftApplyConfig) for this upstream channel. Returns false otherwise
U32 dcxFftCurrentTriggers	1.3.6.1.4.1.4115.1.4.5.1.1.1.1.16	Unsigned32	read-only	Number of FFT triggers since the last FFT process was started.
dcxFftPayloadTable	1.3.6.1.4.1.4115.1.4.5.1.1.2		not-accessible	Arris CMTS FFT upstream channel payload table.
dcxFftPayloadEntry	1.3.6.1.4.1.4115.1.4.5.1.1.2.1		not-accessible	Arris CMTS FFT upstream channel payload entry. Multiple entries in this table exist for each ifEntry with an ifType of docsCableUpstreamInterface (129) that supports the FFT collection and currently has FFT data to report.
U32 dcxFftPayloadIndex	1.3.6.1.4.1.4115.1.4.5.1.1.2.1.1	Unsigned32	not-accessible	An identifier for the 256-byte buffer available at the dcxFftPayloadData object.
DCX dcxFftPayloadData	1.3.6.1.4.1.4115.1.4.5.1.1.2.1.2	DcxFftPayloadBuffer	read-only	The FFT payload data in the buffer identified by dcxFftPayloadIndex.

RFC description

Fast Fourier Transform (FFT) software management for Arris CMTS upstream channel analysis.

Start monitoring ARRIS CMTS (Cable Modem Termination System) 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 ARRIS-CMTS-FFT-MIB

What Is ARRIS-CMTS-FFT-MIB?

Supported Devices

Monitoring Examples

This MIB depends on

Related MIBs

RFC description