CISCO-ADSL-CAP-LINE-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2001-03-01

Category: DSL and Broadband, Textual Conventions and Registries

Description: Manages Cisco CAP-based ADSL line configuration and performance statistics.

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What Is CISCO-ADSL-CAP-LINE-MIB?

CISCO-ADSL-CAP-LINE-MIB is a Cisco enterprise MIB that extends the standard ADSL-LINE-MIB with attributes specific to CAP (Carrierless Amplitude/Phase modulation) based ADSL modems, mirroring the standard MIB's table structure for CAP-specific data. It exposes physical-layer state and performance objects for both ATU-C (central office) and ATU-R (remote/customer) ends, including current line state, receive gain, signal-to-noise ratio, and performance counters such as initialization failures. Its monitoring focus is squarely on physical-layer/hardware line health: SNR and gain values reveal line quality, while initialization-failure counters (including 15-minute interval buckets) reveal instability in the DSL connection. It is explicitly an extension of, and depends on, the standard IETF ADSL-LINE-MIB, adding only CAP-specific objects not already covered there. It is deployed on Cisco routers/access concentrators terminating CAP-modulation ADSL lines, typically in legacy DSL access deployments. Engineers can download the CISCO-ADSL-CAP-LINE-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-ADSL-CAP-LINE-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

Cisco router/access concentrator with ADSL CAP line cards

Monitoring Examples

An operator would poll cAdslAtucCapCurrRxSnr and cAdslAtucCapCurrRxGain from cAdslAtucCapPhysTable to assess central-office-side line quality, compare against cAdslAturCapCurrRxGain for the remote end, and watch cAdslAtucCapPerfInitFailures / cAdslAtucCapPerfCurr15MinInitFailures in cAdslAtucCapPerfDataTable to detect a DSL line that is repeatedly failing to train, indicating cabling or noise problems.

What Can Be Monitored

ATU-C/ATU-R current line state
receive gain
signal-to-noise ratio
line initialization failure counts (current/15-min interval)

Imported Objects

From ADSL-LINE-MIB

adslAtucIntervalNumber	OBJECT-TYPE
adslLineConfProfileName	OBJECT-TYPE

From ADSL-TC-MIB

AdslPerfCurrDayCount
AdslPerfPrevDayCount

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From PerfHist-TC-MIB

PerfCurrentCount
PerfIntervalCount

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
Integer32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

TEXTUAL-CONVENTION
TruthValue

How to Use in IPNetwork Monitor

Example using cAdslAtucCapPerfInitFailures OID:

Select a Cisco DSL access equipment (ADSL CAP lines) 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 cAdslAtucCapPerfInitFailures 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. This object specifies the number of line initialization failures relative to sysUpTime. 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 Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoAdslLineCapMIB	1.3.6.1.4.1.9.9.149			This MIB module serves as an enterprise-specific extension of the ADSL-LINE-MIB. The structure of this MIB module shadows the structure of the ADSL-LINE-MIB, table for table. The tables defined by this MIB module contain managed objects that meet the following criteria: 1) A managed object represents an attribute or characteristic specific to CAP (Carrierless AM/PM) modems. 2) The ADSL-CAP-LINE-MIB does not already contain a managed object representing the same information as this managed object. Observe that entries contained by the tables in this MIB module do not augment the corresponding entries in the ADSL-LINE-MIB, as every modem represented by the ADSL-LINE-MIB is not necessarily a CAP modem. Also observe that entries contained by the tables in this MIB module do not augment the corresponding entries in the ADSL-CAP-LINE-MIB, as this assumes that the ADSL-CAP-LINE-MIB defines tables that correspond to every table defined by the ADSL-LINE-MIB. At this time, this assumption does not hold true. * ABBREVIATIONS, ACRONYMS, AND SYMBOLS * ADSL - Asymmetric Digital Subscriber Line. ATM - Asynchronous Transfer Mode. ATU-C - ADSL Transceiver Unit, Central Office end. ATU-R - ADSL Transceiver Unit, Remote terminal end. BER - Bit Error Ratio. CAP - Carrierless Amplitude Modulation / Pulse Modulation. DSL - Digital Subscriber Line. SNR - Signal-to-Noise Ratio. STM - Synchronous Transfer Mode. * DEFINITIONS * DOWNSTREAM The flow of data in the direction from the ATU-C to ATU-R. MARGIN (also referred to as 'SNR margin') The difference between the SNR of the received signal and the SNR required to provide a BER of 10E-7. SYMBOL The number of bits the transmitter is capable of multiplexing and modulating in a single signalling interval. SYMBOL RATE The rate at which all symbols are transmitted. UPSTREAM The flow of data in the direction from the ATU-R to ATU-C.
ciscoAdslLineCapMIBObjects	1.3.6.1.4.1.9.9.149.1
cAdslAtucCapPhysTable	1.3.6.1.4.1.9.9.149.1.2		not-accessible	This table extends the adslAtucPhysTable and contains enterprise-specific physical layer parameters for the ATU-C class devices supported by the system.
cAdslAtucCapPhysEntry	1.3.6.1.4.1.9.9.149.1.2.1		not-accessible	A set of enterprise-specific physical-layer parameters for an ATU-C class device supported by the system. There exists an entry for each ifEntry with an ifType of adsl(94) and an adslLineCoding of cap(3).
INT cAdslAtucCapCurrState	1.3.6.1.4.1.9.9.149.1.2.1.1	INTEGER	read-only	This object specifies the state of the ATU-C transceiver. The value of this managed is 'idle' for an ATU-C that has been provisioned, but is not physically present in the system.
G32 cAdslAtucCapCurrRxGain	1.3.6.1.4.1.9.9.149.1.2.1.2	Gauge32	read-only	This managed object represents the gain applied to the ATU-C receiver. The value of this managed object is '0' for an ATU-C that has been provisioned, but is not physically present in the system.
G32 cAdslAtucCapCurrRxSnr	1.3.6.1.4.1.9.9.149.1.2.1.3	Gauge32	read-only	This managed object represents the signal-to-noise ratio measured across the the ATU-C receive pair. The value of this managed object is '0' for an ATU-C that has been provisioned, but is not physically present in the system.
cAdslAturCapPhysTable	1.3.6.1.4.1.9.9.149.1.3		not-accessible	This table extends the adslAturPhysTable and contains enterprise-specific physical layer parameters for the ATU-R class devices supported by the system.
cAdslAturCapPhysEntry	1.3.6.1.4.1.9.9.149.1.3.1		not-accessible	A set of enterprise-specific physical-layer parameters for an ATU-R class device supported by the system. There exists an entry for each ifEntry with an ifType of adsl(94) and an adslLineCoding of cap(3).
G32 cAdslAturCapCurrRxGain	1.3.6.1.4.1.9.9.149.1.3.1.1	Gauge32	read-only	This managed object represents the gain applied to the ATU-R receiver. The value of this managed object is '0' if the corresponding ATU-C has been provisioned, but is not physically present in the system.
cAdslAtucCapPerfDataTable	1.3.6.1.4.1.9.9.149.1.6		not-accessible	This table extends the adslAtucPerfDataTable and contains enterprise-specific physical layer statistics for the ATU-C class devices supported by the system.
cAdslAtucCapPerfDataEntry	1.3.6.1.4.1.9.9.149.1.6.1		not-accessible	A set of enterprise-specific physical-layer statistics for an ATU-C class device supported by the system. There exists an entry for each ifEntry with an ifType of adsl(94) and an adslLineCoding of cap(3).
C32 cAdslAtucCapPerfInitFailuresEx	1.3.6.1.4.1.9.9.149.1.6.1.1	Counter32	read-only	This object specifies the number of line initialization failures relative to sysUpTime.
PER cAdslAtucCapPerfCurr15MinInitFailures	1.3.6.1.4.1.9.9.149.1.6.1.2	PerfCurrentCount	read-only	This object specifies the number of line initialization failures in the current 15-minute interval.
ADS cAdslAtucCapPerfCurr1DayInitFailures	1.3.6.1.4.1.9.9.149.1.6.1.3	AdslPerfCurrDayCount	read-only	This object specifies the number of line initialization failures in the current 1-day interval.
ADS cAdslAtucCapPerfPrev1DayInitFailures	1.3.6.1.4.1.9.9.149.1.6.1.4	AdslPerfPrevDayCount	read-only	This object specifies the number of line initialization failures in the previous 1-day interval.
cAdslAtucCapIntervalTable	1.3.6.1.4.1.9.9.149.1.8		not-accessible	This table extends the adslAtucIntervalTable and contains enterprise-specific physical layer statistics intervals for the ATU-C class devices supported by the system.
cAdslAtucCapIntervalEntry	1.3.6.1.4.1.9.9.149.1.8.1		not-accessible	A 15-minute interval of enterprise-specific physical-layer statistics for an ATU-C class device supported by the system. There exists up to 96 entries for each ifEntry with an ifType of adsl(94) and an adslLineCoding of cap(3).
NUM cAdslAtucCapIntervalInitFailures	1.3.6.1.4.1.9.9.149.1.8.1.1	PerfIntervalCount	read-only	This object specifies the number of line initialization failures in the interval.
cAdslLineCapConfProfileTable	1.3.6.1.4.1.9.9.149.1.14		not-accessible	This table extends the adslLineConfProfileTable and contains enterprise-specific ADSL line configuration information.
cAdslLineCapConfProfileEntry	1.3.6.1.4.1.9.9.149.1.14.1		not-accessible	A configuration profile containing enterprise-specific ADSL line configuration information.
INT cAdslLineCapConfTrainingMode	1.3.6.1.4.1.9.9.149.1.14.1.1	INTEGER	read-create	This object specifies the mode employed by the ATU-C and ATU-R when training against each other. One of two training modes can be employed: - Standard An ATU-C initiates a training sequence using the method defined by T1E1.4/99-161R3. This training mode is the default for ADSL modems employing the CAP line code. - Fast An ATU-C initiates a vendor-specific training sequence that can possibly provide a shorter training sequence.
INT cAdslLineCapConfInterleaveDelay	1.3.6.1.4.1.9.9.149.1.14.1.2	INTEGER	read-create	This object specifies the interleave delay for the downstream channel. The value of this object specifies the mapping (relative spacing) between subsequent input bytes at the interleaver input and their placement in the bit stream at the interleaver output. The value 'long' provides greater separation between consecutive input bytes in the output bit stream, thereby allowing for improved impulse noise immunity at the expense of payload latency.
INT cAdslLineCapConfCpeSignature	1.3.6.1.4.1.9.9.149.1.14.1.3	INTEGER	read-create	This object specifies the value of the minimum CPE signature expected from ATU-R during training. The value of the CPE signature corresponds to the software version of the ATU-R. If the CPE signature advertised by an ATU-R is less than the value of this object, then the ATU-C will be placed into an idle state, thereby preventing the line from training. In addition, the agent increments the value of the cAdslAtucCapPerfInitFailures object for each attempt to train by an ATU-R advertising a CPE signature less than the value of this object. When a management client observes the value of cAdslAtucCapPerfInitFailures increasing, it should retrieve the value of the adslAturInvSerialNumber object (for more details, see the ADSL-LINE-MIB) . This value of this object reflects the CPE signature advertised by an ATU-R implementing the CAP line code. If the CPE signature of the ATU-R is not known, the value of the adslAturInvSerialNumber object should be a zero-length string.
INT cAdslAtucCapConfTargetSnrMgn	1.3.6.1.4.1.9.9.149.1.14.1.4	INTEGER	read-create	This object specifies the target SNR margin. This is the desired noise margin the ATU-C must achieve with a BER of 10-7 or better to successfully complete training.
ADS cAdslAtucCapConfMinTxRate	1.3.6.1.4.1.9.9.149.1.14.1.5	AdslLineCapDownstreamRate	read-create	This object specifies the minimum acceptable downstream line rate.
ADS cAdslAtucCapConfMaxTxRate	1.3.6.1.4.1.9.9.149.1.14.1.6	AdslLineCapDownstreamRate	read-create	This object specifies the desired line rate which the ATU-C will attempt to train at.
T/F cAdslAtucCapConfDown136KBaudEnable	1.3.6.1.4.1.9.9.149.1.14.1.7	TruthValue	read-create	This object specifies whether the modem can train the downstream channel using a symbol rate of 136K symbols per second.
T/F cAdslAtucCapConfUp68KBaudEnable	1.3.6.1.4.1.9.9.149.1.14.1.8	TruthValue	read-create	This object specifies whether the modem can train the upstream channel using a symbol rate of 68K symbols per second. The value of this object does not effect whether the modem can train at any other symbol rate; that is, the values of this object and cAdslAtucCapConfUp17KBaudEnable are not mutually exclusive.
T/F cAdslAtucCapConfUp17KBaudEnable	1.3.6.1.4.1.9.9.149.1.14.1.9	TruthValue	read-create	This object specifies whether the modem can train the upstream channel using a symbol rate of 17K symbols per second. The value of this object does not effect whether the modem can train at any other symbol rate; that is, the values of this object and cAdslAtucCapConfUp68KBaudEnable are not mutually exclusive.
I32 cAdslAtucCapConfPsdmLevel	1.3.6.1.4.1.9.9.149.1.14.1.10	Integer32	read-create	This managed object specifies the nominal power output of the ATU-C across the entire transmit spectrum. Observe that this implies the attenuation of the signal for some data rates. This value does not take effect until the modem has retrained against the ATU-C to which the ATU-R has a connection.
INT cAdslAturCapConfTargetSnrMgn	1.3.6.1.4.1.9.9.149.1.14.1.11	INTEGER	read-create	This object specifies the target SNR margin. This is the desired noise margin the ATU-R must achieve with a BER of 10-7 or better to successfully complete training.
ADS cAdslAturCapConfMinTxRate	1.3.6.1.4.1.9.9.149.1.14.1.12	AdslLineCapUpstreamRate	read-create	This object specifies the minimum acceptable upstream line rate.
ADS cAdslAturCapConfMaxTxRate	1.3.6.1.4.1.9.9.149.1.14.1.13	AdslLineCapUpstreamRate	read-create	This object specifies the desired line rate which the ATU-R will attempt to train at.
I32 cAdslAturCapConfPsdmLevel	1.3.6.1.4.1.9.9.149.1.14.1.14	Integer32	read-create	This managed object specifies the nominal power output of the ATU-R across the entire transmit spectrum. Observe that this implies the attenuation of the signal for some data rates. This value does not take effect until the modem has retrained against the ATU-C to which the ATU-R has a connection.
cAdslLineCapMIBNotificationsPrefix	1.3.6.1.4.1.9.9.149.2
cAdslLineCapMIBNotifications	1.3.6.1.4.1.9.9.149.2.0
ciscoAdslLineCapMIBConformance	1.3.6.1.4.1.9.9.149.3
ciscoAdslLineCapMIBCompliances	1.3.6.1.4.1.9.9.149.3.1
ciscoAdslLineCapMIBAtucCompliance	1.3.6.1.4.1.9.9.149.3.1.1			The compliance statement for entities that implement the CISCO-ADSL-CAP-LINE-MIB. Implementation of this MIB is mandatory for any platform that supports one or more ADSL line interfaces that implement the CAP line code.
ciscoAdslLineCapMIBAturCompliance	1.3.6.1.4.1.9.9.149.3.1.2			The compliance statement for entities that implement the CISCO-ADSL-CAP-LINE-MIB and manage ADSL ATU-R class devices. Implementation of this MIB is mandatory for any platform that supports one or more ADSL line interfaces that implement the CAP line code.
ciscoAdslLineCapMIBGroups	1.3.6.1.4.1.9.9.149.3.2
cAdslAtucCapBasicGroup	1.3.6.1.4.1.9.9.149.3.2.1			A collection of managed objects defining the basic operation of an ATU-C implementing the CAP line code.
cAdslAturBasicGroup	1.3.6.1.4.1.9.9.149.3.2.2			A collection of managed objects defining the basic operation of an ATU-R implementing the CAP line code.
cAdslAturCapGroup	1.3.6.1.4.1.9.9.149.3.2.3			A collection of managed objects defining the capability to remotely manage a ATU-R.
cAdslAtucCapPM15MinIntervalGroup	1.3.6.1.4.1.9.9.149.3.2.4			A collection of managed objects defining near-end performance data collection capability using 15-minute intervals.
cAdslAtucCapPM1DayIntervalGroup	1.3.6.1.4.1.9.9.149.3.2.5			A collection of managed objects defining near-end performance data collection capability using 1-day intervals.

RFC description

Enterprise extension for managing ADSL CAP (Carrierless AM/PM) modems with performance metrics specific to CAP technology not covered by standard ADSL MIBs.

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Download CISCO-ADSL-CAP-LINE-MIB