VDSL-LINE-EXT-SCM-MIB

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Organization: ADSLMIB Working Group

Last Updated: 2005-04-28

Category: DSL and Broadband

Description: Extends the VDSL-LINE-MIB with managed objects for configuring and monitoring VDSL lines using Single Carrier Modulation (SCM) line coding.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring VDSL-LINE-EXT-SCM-MIB with a free 30-day trial of IPNetwork Monitor.

What Is VDSL-LINE-EXT-SCM-MIB?

VDSL-LINE-EXT-SCM-MIB is the standard IETF ADSLMIB Working Group MIB extending the VDSL-LINE-MIB (RFC 3728) with SCM (Single Carrier Modulation)-specific line-code parameters — this extension must not be used for VDSL lines using Multiple Carrier Modulation (MCM). Its configuration-profile band table, keyed by band ID, records whether the band is in use, center frequency, symbol rate, constellation size, transmit PSD level, and row status, while a physical-band table reports the same parameters as currently measured, plus current SNR margin and attenuation. As a configuration/performance MIB it lets an administrator confirm a VDSL SCM line's configured vs. actual band parameters and its current SNR margin. It is deployed on VDSL access equipment using SCM line coding. Engineers can download the VDSL-LINE-EXT-SCM-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in VDSL-LINE-EXT-SCM-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

VDSL access equipment (SCM line coding)

Monitoring Examples

An administrator compares vdslLineSCMConfProfileBandTransmitPSDLevel against vdslLineSCMPhysBandCurrPSDLevel to confirm a VDSL SCM band is transmitting at its configured power level.

What Can Be Monitored

VDSL SCM band configuration vs. measured parameters (SNR margin, attenuation)

Imported Objects

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Integer32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32
transmission

From SNMPv2-TC

RowStatus
TEXTUAL-CONVENTION
TruthValue

From VDSL-LINE-MIB

vdslLineConfProfileName

OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using vdslLineSCMPhysBandCurrSnrMgn OID:

Select a VDSL access equipment, SCM line coding (band-parameter/SNR-margin status) 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 vdslLineSCMPhysBandCurrSnrMgn 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. It reports the noise margin as seen by this Vtu and band with respect to its received signal in 0.25 dB. 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 an Integer32-type OID, Value bounds is the most useful condition here — trigger an alert if the value drifts significantly from its normal baseline, since an unexpected change often points to a real underlying issue. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
vdslExtSCMMIB	1.3.6.1.2.1.10.228			The VDSL-LINE-MIB found in RFC 3728 defines objects for the management of a pair of VDSL transceivers at each end of the VDSL line. The VDSL-LINE-MIB configures and monitors the line code independent parameters (TC layer) of the VDSL line. This MIB module is an optional extension of the VDSL-LINE-MIB and defines objects for configuration and monitoring of the line code specific (LCS) elements (PMD layer) for VDSL lines using SCM coding. The objects in this extension MIB MUST NOT be used for VDSL lines using Multiple Carrier Modulation (MCM) line coding. If an object in this extension MIB is referenced by a line which does not use SCM, it has no effect on the operation of that line. Naming Conventions: Vtuc -- VDSL transceiver at near (Central) end of line Vtur -- VDSL transceiver at Remote end of line Vtu -- One of either Vtuc or Vtur Curr -- Current Atn -- Attenuation LCS -- Line Code Specific Max -- Maximum Mgn -- Margin PSD -- Power Spectral Density Rx -- Receive Snr -- Signal to Noise Ratio Tx -- Transmit Copyright (C) The Internet Society (2005). This version of this MIB module is part of RFC 4069: see the RFC itself for full legal notices.
vdslLineExtSCMMib	1.3.6.1.2.1.10.228.1
vdslLineExtSCMMibObjects	1.3.6.1.2.1.10.228.1.1
vdslLineSCMConfProfileBandTable	1.3.6.1.2.1.10.228.1.1.1		not-accessible	This table contains transmit band descriptor configuration information for a VDSL line. Each entry in this table reflects the configuration for one of possibly many bands of a single carrier modulation (SCM) VDSL line. For each profile which is associated with a VDSL line using SCM line coding, five entries in this table will exist, one for each of the five bands. Bands which are not in use will be marked as unused. These entries are defined by a manager and can be used to configure the VDSL line. If an entry in this table is referenced by a line which does not use SCM, it has no effect on the operation of that line.
vdslLineSCMConfProfileBandEntry	1.3.6.1.2.1.10.228.1.1.1.1		not-accessible	Each entry consists of a list of parameters that represents the configuration of a single carrier modulation VDSL modem transmit band. A default profile with an index of 'DEFVAL', will always exist and its parameters will be set to vendor specific values, unless otherwise specified in this document. All read-create objects defined in this MIB module SHOULD be stored persistently.
VDS vdslLineSCMConfProfileBandId	1.3.6.1.2.1.10.228.1.1.1.1.1	VdslSCMBandId	not-accessible	The BandId for this entry, which specifies which band is being referred to.
T/F vdslLineSCMConfProfileBandInUse	1.3.6.1.2.1.10.228.1.1.1.1.2	TruthValue	read-create	Indicates whether this band is in use. If set to True this band is in use.
U32 vdslLineSCMConfProfileBandCenterFrequency	1.3.6.1.2.1.10.228.1.1.1.1.3	Unsigned32	read-create	Specifies the center frequency in Hz
U32 vdslLineSCMConfProfileBandSymbolRate	1.3.6.1.2.1.10.228.1.1.1.1.4	Unsigned32	read-create	The requested symbol rate in baud.
U32 vdslLineSCMConfProfileBandConstellationSize	1.3.6.1.2.1.10.228.1.1.1.1.5	Unsigned32	read-create	Specifies the constellation size.
U32 vdslLineSCMConfProfileBandTransmitPSDLevel	1.3.6.1.2.1.10.228.1.1.1.1.6	Unsigned32	read-create	The requested transmit power spectral density for the VDSL modem. The Actual value in -0.25 dBm/Hz.
ROW vdslLineSCMConfProfileBandRowStatus	1.3.6.1.2.1.10.228.1.1.1.1.7	RowStatus	read-create	This object is used to create a new row or modify or delete an existing row in this table. A profile activated by setting this object to `active'. When `active' is set, the system will validate the profile. None of the columns in this row may be modified while the row is in the `active' state. Before a profile can be deleted or taken out of service, (by setting this object to `destroy' or `notInService') it must be first unreferenced from all associated lines.
vdslLineSCMPhysBandTable	1.3.6.1.2.1.10.228.1.1.2		not-accessible	This table provides one row for each SCM Vtu band. This table is read only as it reflects the current physical parameters of each band. For each ifIndex which is associated with a VDSL line using SCM line coding, five entries in this table will exist, one for each of the five bands. Bands which are not in use will be marked as unused.
vdslLineSCMPhysBandEntry	1.3.6.1.2.1.10.228.1.1.2.1		not-accessible	An entry in the vdslLineSCMPhysBandTable.
VDS vdslLineSCMPhysBandId	1.3.6.1.2.1.10.228.1.1.2.1.1	VdslSCMBandId	not-accessible	The BandId for this entry, which specifies which band is being referred to.
T/F vdslLineSCMPhysBandInUse	1.3.6.1.2.1.10.228.1.1.2.1.2	TruthValue	read-only	Indicates whether this band is in use. If set to True this band is in use.
U32 vdslLineSCMPhysBandCurrCenterFrequency	1.3.6.1.2.1.10.228.1.1.2.1.3	Unsigned32	read-only	The current center frequency in Hz for this band.
U32 vdslLineSCMPhysBandCurrSymbolRate	1.3.6.1.2.1.10.228.1.1.2.1.4	Unsigned32	read-only	The current value of the symbol rate in baud for this band.
U32 vdslLineSCMPhysBandCurrConstellationSize	1.3.6.1.2.1.10.228.1.1.2.1.5	Unsigned32	read-only	The current constellation size on this band.
U32 vdslLineSCMPhysBandCurrPSDLevel	1.3.6.1.2.1.10.228.1.1.2.1.6	Unsigned32	read-only	The transmit power spectral density for the VDSL modem.
I32 vdslLineSCMPhysBandCurrSnrMgnEx	1.3.6.1.2.1.10.228.1.1.2.1.7	Integer32	read-only	Noise margin as seen by this Vtu and band with respect to its received signal in 0.25 dB.
U32 vdslLineSCMPhysBandCurrAtn	1.3.6.1.2.1.10.228.1.1.2.1.8	Unsigned32	read-only	Measured difference in the total power transmitted by the peer Vtu on this band and the total power received by this Vtu on this band in 0.25 dB.
vdslLineExtSCMConformance	1.3.6.1.2.1.10.228.1.2
vdslLineExtSCMGroups	1.3.6.1.2.1.10.228.1.2.1
vdslLineExtSCMGroup	1.3.6.1.2.1.10.228.1.2.1.1			A collection of objects providing configuration information for a VDSL line based upon single carrier modulation modem.
vdslLineExtSCMCompliances	1.3.6.1.2.1.10.228.1.2.2
vdslLineExtSCMMibCompliance	1.3.6.1.2.1.10.228.1.2.2.1			The compliance statement for SNMP entities which manage VDSL interfaces.

RFC description

Extends VDSL-LINE-MIB with SCM line coding configuration and monitoring of PMD layer parameters for VDSL transceivers.

Start monitoring VDSL access equipment, SCM line coding (band-parameter/SNR-margin 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.

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