DC-OPT-MIB

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Category: IP Routing

Description: Provides optional management extensions for Data Connection routing and protocol software.

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What Is DC-OPT-MIB?

DC-OPT-MIB is a vendor-private MIB (registered under the Codex enterprise OID, codex.cdxProductSpecific.cdx6500) that defines optional Data Compression (DC) management objects for the Codex 6500 statistical multiplexer product line, despite its DC-OPT-MIB name suggesting a link to the unrelated 'Data Connection' company -- the source module is unambiguously scoped to Codex 6500 hardware. It provides general DC statistics in cdx6500DCGenStatTable, such as cdx6500DCGenStatDSPStatus (up/down/missing) for the DC SIMM/DSP hardware, cdx6500DCGenStatMaxChannels versus cdx6500DCGenStatChanInUse, cdx6500DCGenStatRejectConn for calls turned away due to channel exhaustion, and encoder/decoder queue-depth objects; a per-channel cdx6500DCChanStatTable, indexed by channel number, reports cdx6500DCChanStatChanState (idle/negotiating/dataPassing/clearing, etc.), cdx6500DCChanStatXmitCRatio compression ratio, frame/byte counters for both encoder and decoder, and error counters like cdx6500DCChanStatDSWithBadFrames/BadHeaders; a cdx6500ContDC branch provides write-only reset controls per channel. Because it directly exposes DSP hardware health and per-channel compression performance, it is useful for detecting a failed DC SIMM, channel exhaustion under load, or a channel producing corrupted frames. It depends only on RFC1155-SMI/RFC-1212 base conventions and the parent Codex enterprise MIB tree, and is deployed on Codex 6500 multiplexers in legacy WAN data-compression deployments; administrators can download the DC-OPT-MIB file to monitor Data Compression channel health on these devices.

IPNetwork Monitor allows you to monitor SNMP objects defined in DC-OPT-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

Codex 6500-series statistical multiplexer/data compression modules (Motorola Codex)

Monitoring Examples

An operator polls cdx6500DCGenStatTable to confirm cdx6500DCGenStatDSPStatus reports up(2) and compares cdx6500DCGenStatChanInUse against cdx6500DCGenStatMaxChannels for headroom, then checks cdx6500DCChanStatTable for a specific channel's cdx6500DCChanStatDSWithBadFrames counter; a DSP status of down(1) combined with a rising cdx6500DCGenStatRejectConn count would indicate the compression hardware has failed and new calls are being rejected.

What Can Be Monitored

DC (Data Compression) SIMM/DSP hardware status
active vs. maximum data-compression channels in use
call requests rejected due to channel unavailability
per-channel compression ratio and channel state
encoder/decoder frame and byte counters
corrupted/bad-header decoded frame counters

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter
Gauge
enterprises

OIDs

OID symbolic	OID numeric	Type	Access	Description
codex	1.3.6.1.4.1.449
cdxProductSpecific	1.3.6.1.4.1.449.2
cdx6500	1.3.6.1.4.1.449.2.1
cdx6500Statistics	1.3.6.1.4.1.449.2.1.3
cdx6500StatOtherStatsGroup	1.3.6.1.4.1.449.2.1.3.2
cdx6500DCStatTable	1.3.6.1.4.1.449.2.1.3.2.10
cdx6500DCGenStatTable	1.3.6.1.4.1.449.2.1.3.2.10.1
cdx6500DCGenStatTableEntry	1.3.6.1.4.1.449.2.1.3.2.10.1.1
INT cdx6500DCGenStatDSPStatus	1.3.6.1.4.1.449.2.1.3.2.10.1.1.1	INTEGER	read-only	This parameter specifies the current status/existence of the DC SIMM/DSP on the motherboard. up - DC SIMM/DSP is installed and operational. down - DC SIMM/DSP is non-functional. missing - DC SIMM/DSP is missing.
INT cdx6500DCGenStatHndlrSWRev	1.3.6.1.4.1.449.2.1.3.2.10.1.1.2	INTEGER	read-only	This parameter displays the DC Handler Software Revision Number.
INT cdx6500DCGenStatFnctnSWRev	1.3.6.1.4.1.449.2.1.3.2.10.1.1.3	INTEGER	read-only	DC Function Revision number. For example, revision number of DSP firmware.
INT cdx6500DCGenStatMaxChannels	1.3.6.1.4.1.449.2.1.3.2.10.1.1.4	INTEGER	read-only	Number of DC Channels supported.
INT cdx6500DCGenStatChanInUse	1.3.6.1.4.1.449.2.1.3.2.10.1.1.5	INTEGER	read-only	Number of DC Channels in use.
INT cdx6500DCGenStatMaxSmltChanUse	1.3.6.1.4.1.449.2.1.3.2.10.1.1.6	INTEGER	read-only	Maximum number of DC Channels in use simultaneously since the last stats reset.
INT cdx6500DCGenStatRejectConn	1.3.6.1.4.1.449.2.1.3.2.10.1.1.7	INTEGER	read-only	Number of call requests rejected due to the unavailability of DC channels.
STR cdx6500DCGenStatAggCRatio	1.3.6.1.4.1.449.2.1.3.2.10.1.1.8	DisplayString	read-only	Ratio of total number of incoming charactersfor all DC channels to total number of outgoing characters for all channels, for the past minute.
INT cdx6500DCGenStatCurrEncQDepth	1.3.6.1.4.1.449.2.1.3.2.10.1.1.9	INTEGER	read-only	Current number of frames in the encoder queue, waiting to be compressed.
INT cdx6500DCGenStatMaxEncQDepth	1.3.6.1.4.1.449.2.1.3.2.10.1.1.10	INTEGER	read-only	Maximum number of frames that were on the encoder queue since the last stats reset.
STR cdx6500DCGenStatTmOfMaxEncQDepth	1.3.6.1.4.1.449.2.1.3.2.10.1.1.11	DisplayString	read-only	Time when the maximum Encoder Queue Depth is reached.
INT cdx6500DCGenStatCurrDecQDepth	1.3.6.1.4.1.449.2.1.3.2.10.1.1.12	INTEGER	read-only	Current number of frames in the decoder queue, waiting to be decompressed.
INT cdx6500DCGenStatMaxDecQDepth	1.3.6.1.4.1.449.2.1.3.2.10.1.1.13	INTEGER	read-only	Maximum number of frames that were on the decoder queue waiting to be decompressed.
STR cdx6500DCGenStatTmOfMaxDecQDepth	1.3.6.1.4.1.449.2.1.3.2.10.1.1.14	DisplayString	read-only	Time when the maximum Decoder Queue Depth is reached.
cdx6500DCChanStatTable	1.3.6.1.4.1.449.2.1.3.2.10.2		not-accessible	The Data Compression Channel Statistics Table.
cdx6500DCChanStatTableEntry	1.3.6.1.4.1.449.2.1.3.2.10.2.1		not-accessible	Each entry in this table pertains to the Data Compression Channel statistics.
INT cdx6500DCChanStatChanNum	1.3.6.1.4.1.449.2.1.3.2.10.2.1.1	INTEGER	read-only	Channel number whose statistics were requested.
STR cdx6500DCChanStatTmOfLastStatRst	1.3.6.1.4.1.449.2.1.3.2.10.2.1.2	DisplayString	read-only	Time when the node restarted or the stats reset by CTP/SNMP Manager command.
INT cdx6500DCChanStatChanState	1.3.6.1.4.1.449.2.1.3.2.10.2.1.3	INTEGER	read-only	Activity state of the DC channel. dspDown - DSP is down. idle - DSP is ready to be assigned to a connection. negotiating - Source has accepted the Call Request and is waiting for a Call Accept from the destination node. dataPassing - Normal data passing state. apClearing - Call Clear request arrived from access side. npClearing - Call Clear request arrived from network side. clearingCall - A call collision or a Call Clear along with a X.25 reset or a `start buffer discarding'. flushingOnClr - Call has been cleared with FLUSH, waiting packets to flush from DC Handler rings. flushingData - Waiting for x25 confirm. flushingDCRing - Waiting for the data on the DC Handler ring to be flushed after a x.25 confirm or stop discard. clearing - Call has been cleared.
STR cdx6500DCChanStatSourceChan	1.3.6.1.4.1.449.2.1.3.2.10.2.1.4	DisplayString	read-only	Access Protocol's identity string.
STR cdx6500DCChanStatDestChan	1.3.6.1.4.1.449.2.1.3.2.10.2.1.5	DisplayString	read-only	Network Protocol's identity string.
STR cdx6500DCChanStatXmitCRatio	1.3.6.1.4.1.449.2.1.3.2.10.2.1.6	DisplayString	read-only	Actual compression ratio for outgoing data. This is a 60 second snapshot. Range is 1 - 9.2
CTR cdx6500DCChanStatNumOfEncFrames	1.3.6.1.4.1.449.2.1.3.2.10.2.1.7	Counter	read-only	Number of frames received from the Access Protocol to be compressed.
CTR cdx6500DCChanStatNumOfCharInToEnc	1.3.6.1.4.1.449.2.1.3.2.10.2.1.8	Counter	read-only	Number of bytes pushed into the encoder to be compressed.
CTR cdx6500DCChanStatNumOfCharOutOfEnc	1.3.6.1.4.1.449.2.1.3.2.10.2.1.9	Counter	read-only	Number of compressed bytes produced by the encoder.
CTR cdx6500DCChanStatNumOfDecFrames	1.3.6.1.4.1.449.2.1.3.2.10.2.1.10	Counter	read-only	Number of frames received from the Network Protocol to be decompressed.
CTR cdx6500DCChanStatNumOfCharInToDec	1.3.6.1.4.1.449.2.1.3.2.10.2.1.11	Counter	read-only	Number of bytes pushed into the decoder to be decompressed.
CTR cdx6500DCChanStatNumOfCharOutOfDec	1.3.6.1.4.1.449.2.1.3.2.10.2.1.12	Counter	read-only	Number of decompressed bytes produced by the decoder.
CTR cdx6500DCChanStatEncAETrnstnCnt	1.3.6.1.4.1.449.2.1.3.2.10.2.1.13	Counter	read-only	Number of times the encoder switched from compressed mode to anti-expansion mode.
CTR cdx6500DCChanStatEncAEFrameCnt	1.3.6.1.4.1.449.2.1.3.2.10.2.1.14	Counter	read-only	Number of anti-expansion frames sent by the encoder.
INT cdx6500DCChanStatEncAEModeStatus	1.3.6.1.4.1.449.2.1.3.2.10.2.1.15	INTEGER	read-only	Anti Expansion mode Status for Encoder : on - Data Compression is in the anti expansion mode. off - Data Compression is out of the anti expansion mode.
CTR cdx6500DCChanStatDecAETrnstnCnt	1.3.6.1.4.1.449.2.1.3.2.10.2.1.16	Counter	read-only	Number of times the decoder switched from compressed mode to anti-expansion mode.
CTR cdx6500DCChanStatDecAEFrameCnt	1.3.6.1.4.1.449.2.1.3.2.10.2.1.17	Counter	read-only	Number of anti-expansion frames received by the decoder.
INT cdx6500DCChanStatDecAEModeStatus	1.3.6.1.4.1.449.2.1.3.2.10.2.1.18	INTEGER	read-only	Anti Expansion mode Status for Decoder : on - Data Compression is in the anti expansion mode. off - Data Compression is out of the anti expansion mode.
CTR cdx6500DCChanStatDSWithBadFrames	1.3.6.1.4.1.449.2.1.3.2.10.2.1.19	Counter	read-only	Number of decoded frames detected by the decoder to have been corrupted. This includes frames with bad headers.
CTR cdx6500DCChanStatDSWithBadHeaders	1.3.6.1.4.1.449.2.1.3.2.10.2.1.20	Counter	read-only	Number of decoded frames detected by the decoder to have a bad header.
CTR cdx6500DCChanStatDSDueToRstOrCng	1.3.6.1.4.1.449.2.1.3.2.10.2.1.21	Counter	read-only	Number of packets discarded while processing a X.25 reset or during node congestion.
cdx6500Controls	1.3.6.1.4.1.449.2.1.4
cdx6500ContDC	1.3.6.1.4.1.449.2.1.4.9
INT cdx6500ContResetAllDCStats	1.3.6.1.4.1.449.2.1.4.9.1	INTEGER	write-only	Reset the DC Statistics for all channels.
cdx6500ContDCTable	1.3.6.1.4.1.449.2.1.4.9.2		not-accessible	These resets require the channel number as the index.
cdx6500ContDCTableEntry	1.3.6.1.4.1.449.2.1.4.9.2.1		not-accessible	Each entry represents a control parameter used to reset Channel Statistics or Channel Vocabulary.
INT cdx6500ContDCChanNum	1.3.6.1.4.1.449.2.1.4.9.2.1.1	INTEGER	read-only	Channel number used as the index.
INT cdx6500ContResetDCChanStats	1.3.6.1.4.1.449.2.1.4.9.2.1.2	INTEGER	write-only	Reset the DC Statistics for this channel.
INT cdx6500ContResetDCChanVocab	1.3.6.1.4.1.449.2.1.4.9.2.1.3	INTEGER	write-only	Reset the vocabulary/history buffer for this channel if this channel number is active.

RFC description

Manages the DC (Digital Communications) SIMM/DSP module statistics on Codex 6500 series equipment. Provides status, revision information, and channel configuration for digital communication handlers.

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Download DC-OPT-MIB

What Is DC-OPT-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description