Cisco Systems Octal-Port DMT ATU-C Line Card User Manual

Octal-Port DMT ATU-C Line Card

This feature module describes the Cisco IOS support for the octal-port DMT ATU-C (8xDMT) line card. It includes information on new and modified commands.

This document includes the following sections:

• Feature Overview, page 1

• Supported Platforms, page 4

• Supported Standards, MIBs, and RFCs, page 5

• Prerequisites, page 6

• Configuration Tasks, page 6

• Configuration Examples, page 9

• Command Reference, page 10

• Glossary, page 27

Feature Overview

The 8xDMT line card provides higher port density for the Cisco 6015, Cisco 6160, and Cisco 6260. This line card:

• Supports eight ADSL modem connections per card.

• Converts ADSL modulation from the line card into digital data streams to and from the NI-2 card.

• Negotiates the line rate with the customer premises equipment (CPE) when it trains and bases the

rate on line quality and distance.

• Provides subscriber and port provisioning through DSL profiles.

–

Allows single latency—Fast or interleaved path selection.

–

Supports trellis encoding.

–

Supports bit swapping.

• Interoperates with certain CPE. For more detailed information, see the “Supported Platforms”

section on page 4.

Note Check with a Cisco customer representative to verify CPE compatibility with

the 8xDMT.

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Feature Overview

Benefits

Octal-Port DMT ATU-C Line Card

G.hs Support (ITU G.994.1)

G.hs support is provided through both the MIB and the CLI. Features from G.hs that are supported include:

• Enabling/disabling all or one of the following modes.

–

G.dmt

–

T1.413 Issue 2

–

G.lite

• Setting auto mode defers the mode selection to the ATU-R.

• Displaying current mode/capability.

Bit Swapping

Bit swapping is a mechanism that allows DMT transceiversto reallocate bits between carriers and adjust gain scaling based on the carrier SNR margin.

Fast or Interleaved Path Selection

The fast path feature allows you to configure either the fast or the interleave path via DSL profile configurationcommandsprovidedthat the CPE also supports fast path. Youcanuse either the interleave or fast path with the 8xDMT line card provided that the CPE also supports fast path. The fast path provides improved latency characteristics for applications that cannot tolerate latency (for example, voice).

The parametersforeitherpath are configurableusing the DSL profile configuration commands. Note that although you can configure both paths, only one path will actually be enabled (dual latency is not supported at this time). Thus the maximum bit rates for the unused path must be zero. For example, to configureand use the fast path, you must specify nonzero maximum bit rates for the fast path. Once you configurethe maximum bit rates for the fast path, the rates for the interleave path must be zero. The IOS software ensures that only one path is enabled at a given time.

Trellis Encoding

Trellis encoding is a method of providing better performance in a noisy environment. The end result of using Trellis encoding is that you can transmit at faster line rates with lower error rates, thus providing a faster overall throughput in a moderately noisy environment. You can enable or disable trellis encoding for a specific DSL profile.

Enhanced Line Quality Monitoring and Management

The 8xDMT improves the manageability of DMT ports on supported DSLAMs. The following commands are used to configure this functionality:

• dmt minrate-blocking

DMT minrate-blocking customizes the DMT port reaction to lines that train below configured minimum bit rates. Formerly, if a line trained below the configured minimum bit rate threshold, it would generate a minor alarm, but the DMT port remained active. The dmt minrate-blocking prevents DMT ports from training when bit rates fall below the configured minimum threshold specified in the dmt bitrate minimum command.

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Restrictions

Feature Overview

Note The original option, which generates a minor alarm when configured minimum bit rates are

not met, is configured by default in DSL profiles. The default configuration is no dmt minrate-blocking.

• dmt rate-adaptation

The dmt rate-adaptation command monitors the signal-to-noise ratio (SNR) on DSL lines. When enabled, software monitors the upstream and downstream DMT ports for low SNR margins. When the actual upstream or downstream margin falls below the dmt rate-adaptation margin for the duration of the configured rate-adaptation interval, the line drops and attempts to retrain. If the line is able to retrain, it trains to a lower bit rate with improved SNR margins.

The 8xDMT card is not spectrally compatible with SDSL, G.shdsl, or IDSL. Place these cards in a separate chassis half when using them in the same chassis as 8xDMT line cards.

Related Features and Technologies

The 8xDMT line card is an upgrade of the 4xDMT (6260) and 4xFlexi (6160, 6260, 6015) line cards.

Supported Platforms

DSLAMs

This feature supports the 8xDMT line card on the Cisco 6015, Cisco 6160, and Cisco 6260 platforms with NI-2. Table 1details the total available ADSL modem connections for each chassis.

Table 1 Number of Available Modem Connections for Each Chassis

Chassis

Cisco 6015 6 48 Cisco 6160 32 256 Cisco 6260 30 240

The 8xDMT is designed for use with the Cisco 6015, Cisco 6160, or Cisco 6260 chassis in one of the following configurations:

• Cisco 6015, Cisco 6160, or Cisco 6260 with a POTS splitter chassis—Provisions one modem

directly and is physically connected to one specific subscriber line through the POTS splitter chassis.

• Cisco 6015, Cisco 6160, or Cisco 6260 without a POTS splitter chassis—Provisions one modem

directly and is physically connected to one specific subscriber line through the main distribution frame (MDF) connections.

Octal-Port DMT ATU-C Line Card

Number of Available 8xDMT Slots Total ADSL Modem Connections

CPE

• Cisco 677

• Cisco 678

• Cisco Soho 77

• Cisco 827

• Cisco IAD 2423

• Cisco 1700, Cisco 2600, and Cisco 3600 series with ADSL WIC

• Alcatel Speed Touch Home

• Alcatel Speed Touch Pro

• Efficient Networks 5260 and 5262

• Westell modems based on Alcatel Microelectronics firmware version 1.4.1

• CPE using ADI chipsets with firmware versions 0X3019BE70 (Version 3.0),

0X2219BE04 (Version 2.2), or 0X2019BE2D (Version 2.0) should operate similar to the Cisco 677

Note A correct firmware version does not guarantee interoperation with third-party CPE. Some

hardware variations can affect performance and error rates. Test the interoperation of CPE with the 8xDMT in the targeted deployment model before provisioning service.

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Supported Standards, MIBs, and RFCs

Standards

• ANSI T1.413-Issue 2, Category 1 only

• ANSI T1.413-Issue 2, Annex F (Reduced NEXT)

• Universal Test & Operations PHY for ATM, Level 2; A standard for transport of ATM cells over a

16-bit parallel data bus. See ATM Forum document af-phy-0039.000.

• ITU G.992.1, Annex A (G.dmt)

• ITU G.992.2. (G.lite)

• ITU G.994.1. (G.hs)

Standard MIBS

To obtain lists of supported MIBs by platform and Cisco IOS release and to download MIB modules, go to the Cisco MIB web site on Cisco Connection Online (CCO) at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.

• IETF RFC 1695, Definitions of Managed Objects for ATM Management Version 8.0 using SMIv2

• IETF RFC 2662, Definitions of Managed Objects for the ADSL Line (obsoletes ADSL Forum TR-

006, SNMP-based ADSL Line MIB)

–

Objects not supported for 8xDMT: From AdslLineConfProfileEntry - adslAtucConfRateChanRatio, adslAtucConfMaxSnrMgn,

adslAtucConfUpshiftSnrMgn, adslAturConfRateChanRatio, adslAturConfMaxSnrMgn, adslAturConfUpshiftSnrMgn,adslAturConfMinUpshiftTime.

AdslLineAlarmConfProfileEntry

• ADSL Forum TR-014, DMT Line Code Specific MIB

–

Objects not supported for 8xDMT: FromAdslLineDmtConfProfileEntry-adslAtucDmtConfFreqBins, adslAturDmtConfFreqBins,

adslAtucDmtConfInterleavePath,adslAtucDmtConfFastPath,adslAturDmtConfInterleavePath, adslAturDmtConfFastPath.

Supported Standards, MIBs, and RFCs

Cisco-Derived MIBS

• CISCO-ADSL-LINE-MIB

–

Objects not supported for DMT8:

• CISCO-ADSL-DMT-LINE-MIB

–

Objects not supported for DMT8: From the cAdslDmtLineConfProfileGroup cAdslAtucDmtConfBitSwapEnabled,

cAdslAtucDmtConfBitSwapFrom, cAdslAtucDmtConfBitSwapTo. You can set these objects via SNMP, however, the 8xDMT cards will ignore these objects when provisioning ports for service.

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Prerequisites

To use the 8xDMT feature, you must have one of the following DSLAMs with the 8xDMT line card, and IOS 12.1(6) or above installed:

• Cisco 6015

• Cisco 6160

• Cisco 6260

Configuration Tasks

See the following sections for configuration tasks for the 8xDMT feature. Each task in the list indicates if the task is optional or required.

• Preprovisioning the 8xDMT Line Card, page 6 (optional)

• Creating and Associating a DSL Profile with Each Port, page 7 (required)

• Modifying the DSL Profile, page 7 (optional)

Octal-Port DMT ATU-C Line Card

Preprovisioning the 8xDMT Line Card

Starting at the global configuration prompt, use the following commands to preprovision a slot for use with the 8xDMT line card:

Command Purpose

Step 1

Step 2

Step 3 Step 4

Step 5

Step 6

DSLAM(config)# slot 1 ATUC-1-DMT8

DSLAM(config)# dsl-profile 8xDMT

DSLAM(config-dsl-prof)# exit DSLAM(config)# interface atm1/1

DSLAM(config-if)# dsl profile 8xDMT

DSLAM(config-if)# exit

This command associates the 8xDMT line card with the specified slot.

Creates and names the DSL profile, 8xDMT in this example.

Return to the global configuration prompt. Enter interface configuration mode on the port

where you will associate the 8xDMT DSL profile. Repeat this process on each port that you wish to

associate with a DSL profile. Associates the DSL profile named 8xDMT with

atm interface 1/1. Return to the global configuration prompt.

Tips After you have completed these steps, insert the 8xDMT line card to activate the card with your

preprovisioned configuration.

Verifying the Preprovisioned Slot

Use the show running-configuration command to verify that you preprovisioned the slot correctly.

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Creating and Associating a DSL Profile with Each Port

Before starting this configuration task, install the 8xDMT line card. Refer to the Octal-PortDMT ATU-C Line Card FRU Installation and Configuration Notes for information on installing the 8xDMT line card.

Starting at the global configuration prompt, use the following procedure to associate a DSL profile with a port:

Command Purpose

Step 1

Step 2 Step 3

Step 4

Step 5

DSLAM(config)# dsl-profile 8xDMT

DSLAM(config-dsl-prof)# exit DSLAM(config)# interface atm1/1

DSLAM(config-if)# dsl-profile 8xDMT

DSLAM(config-if)# exit

Select the profile that you want to attach to the selected port. The profile name 8xDMT is used as an example.

Return to the global configuration prompt. Enter interface configuration mode on the port

where you will associate the 8xDMT DSL profile. Repeat this process on each port that you wish to

associate with a DSL profile. Associate the DSL profile 8xDMT with

atm interface 1/1. Return to the global configuration prompt.

Configuration Tasks

Verifying the DSL Profiles

You can use the show dsl profile profile-namecommand to verify that a DSL profileis attached to a port. You can also use the show running-configuration command to verify that the DSL profile is associated with a port.

Tips If no DSL profile appears in the show running-configuration command output, the default

DSL profile is enabled. See the “Command Reference” section on page 10 for the default configuration values.

Modifying the DSL Profile

Starting at the global configuration prompt, use the following procedure to modify the default bit rate, signal-to-noise ratio, DMT check bytes, and overhead framing parameters in your DSL profile:

Caution Before migrating from interleave mode to fast path, determine whether the deployed CPEs offer

support for the feature. The Cisco 600 series CPEs currently do not support fast path.

Command Purpose

Step 1 Step 2

DSLAM(config)# dsl-profile 8xDMT DSLAM(config-dsl-profile)# dmt bitrate

maximum fast downstream 3200 upstream 640

Enter DSL profile configuration mode. Set a DMT bit rate of 3200 kbps downstream and 640 kbps

upstream on the fast path. Automatically configures the interleaved path to 0 kbps.

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Command Purpose

Step 3

Step 4

Step 5

Step 6

DSLAM(config-dsl-profile)# dmt check-bytes fast downstream 0 upstream 0

DSLAM(config-dsl-profile)# dmt margin downstream 12 upstream 6

DSLAM(config-dsl-profile)# dmt overhead-framing mode1

DSLAM(config-dsl-profile)# exit

Troubleshooting Tips

Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools.

For Cisco.com registered users, additional troubleshooting tools are available from the TAC website. To obtain troubleshooting help, go to the Cisco Troubleshooting Assistant web site on Cisco Connection Online (CCO) at:

http://www.cisco.com/kobayashi/support/tac/tsa/dslstep.html

Also see the “Monitoring and Maintaining the 8xDMT Line Card” section on page 8.

Octal-Port DMT ATU-C Line Card

Set the upstream and downstream FEC check (redundancy) bytes to 0.

Set the downstream and upstream signal-to-noise ratio (SNR) margins for a DSL profile.

Set the overhead framing mode, in this example to 1.

Return to the global configuration prompt.

Monitoring and Maintaining the 8xDMT Line Card

Use the following commands to monitor and maintain the 8xDMT line card:

Command Purpose

DSLAM# show dsl interface atm s

DSLAM# show dsl status DMT DSLAM# show facility-alarm status

DSLAM# show hardware

lot/port

These commands display basic information about the DSL link, including port status, dsl statistics, line errors, and cards detected.

The show facility-alarm status command displays all of the current major and minor alarms and the user-configurable alarm thresholds for temperature. After an alarm condition is indicated (by LEDs or bells), you can use the show facility-alarm status command to determine the cause of the alarm.

Note You must turn on the alarms in the profile for alarms to

be displayed.

The show hardware command shows information on each of the slots in your chassis. It tells whether line cards, fan trays, and PEMs are present.

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Configuration Examples

The following example shows a profile named 8xDMT2 being created. The profile uses the default profile values for any parameters not specified.

Current configuration : 7019 bytes ! version 12.1 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname DSLAM ! boot system flash:ni2-dsl-mz.121-6.DA.bin slot 1 ATUC-4FLEXIDMT slot 2 ATUC-1-DMT8 slot 3 ATUC-4FLEXIDMT slot 4 ATUC-4FLEXIDMT slot 5 ATUC-4FLEXIDMT slot 6 ATUC-4FLEXIDMT enable password cisco ! ! ! ! ! ! dsl-profile default dmt bitrate maximum interleaved downstream 8032 upstream 864 cap bitrate maximum downstream 7168 upstream 1088 ! dsl-profile 8xdmt ! dsl-profile 8xDMT2 dmt overhead-framing mode1

dmt check-bytes fast downstream 12 upstream 6 dmt margin downstream 12 upstream 6 dmt bitrate maximum fast downstream 3200 upstream 640 dmt bitrate maximum interleaved downstream 0 upstream 0 network-clock-select 1 system ip subnet-zero ip host-routing no ip finger

Configuration Examples

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Command Reference

This section documents the new and modified commands that are specific to the8xDMT feature. All other commands used with this feature are documented in the Command Reference for Cisco DSLAMS with NI-2. For information on other Cisco IOS commands that can be used on the NI-2 DSL systems, see the Cisco ATM Switch Router Command Reference Guide.

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alarms

To enable alarms in profile command mode, use the alarms command. To disable alarms, use the no form of the command.

alarms

Syntax Description This command has no keywords or arguments.

Defaults Disabled.

Command Modes Profile configuration.

alarms

Command History

Release Modification

12.0(5)DA This command was introduced in a previous release.

12.1(6)DA Conditions that cause alarms were added.

Usage Guidelines The command affects minor alarms for DSL subscriber ports only. The alarms this command controls

apply to these event classes:

• Near End LOS

• Near End interleaved LOCD

• Near End fast LOCD

• Near End LOF

• No CPE detected

• Bit rates below configured minimum

• Subscriber port failure

• Upstream or downstream bit rate not above minimum bit rate

Enabling or disabling alarms affects the specifiedprofile only. For example, if you disable alarms on the default profile, other profiles are unaffected.

Use alarms and no alarms to enable and disable minor alarms related to DSL subscriber ports. When these alarms are disabled, you receiveno notificationwhen alarm conditions exist. (Notificationmethods include console messages, LEDs, the output of the show facility-alarm command, and relay alarm signals to external systems for audible or visible alarms.) However, you can track the condition of DSL ports on which alarms are disabled, including conditions that ordinarily trigger alarms, using the command show dsl interface atm slot#/port#.

You can suppress minimum bit rate alarms without disabling other alarms for the profile.

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alarms

Note The alarms command has no effect on critical alarms, major alarms, or minor alarms related to

subsystems other than the DSL subscriber ports.

Examples In this example, the command enables alarms for the default profile:

DSLAM# configure terminal DSLAM(config)# dsl-profile default DSLAM(config-dsl-prof)# alarms

Related Commands Command Description

dsl-profile profile name Select an existing DSL profile for modification. show dsl interface atm slot#/port# Display DSL, DMT, and ATM status for a port. show dsl profile Display a specific profile, all ports to which the profile

is currently attached, and those port settings.

show facility-alarm status Display the current major and minor alarm status, if any,

and display the configuration of the alarm thresholds.

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dmt bitrate

To set the maximum and minimum allowed bit rates for the fast or interleaved DMT profile parameters, use the dmt bitrate profile configuration command. To reset this command to the default value, use the

no form of this command.

dmt bitrate maximum {fast | interleaved} downstream dmt-bitrate upstream dmt-bitrate dmt bitrate minimum {fast | interleaved} downstream dmt-bitrate upstream dmt-bitrate

Syntax Description

Defaults • The default no dmt bitrate maximum interleaved sets the maximum downstream and upstream

Command Modes Profile configuration.

Command History

dmt-bitrate The DMT bit rate is given as a multiple of 32 kbps. If you enter a

nonmultiple of 32 kbps, the system rejects and aborts the command. See the allowed ranges and default values in Usage Guidelines.

fast Specify the DMT fast latency path. interleaved Specify the DMT interleaved latency path.

interleaved bit rate to 640 and 128 kbps respectively. This command causes the port to retrain.

• The default no dmt bitrate maximum fast sets both the maximum downstream and upstream

fastpath bit rates to zero. This command causes the port to retrain.

• The default no dmt bitrate minimum interleaved sets both the minimum downstream and upstream

interleaved bit rates to zero. This command does not cause the port to retrain.

• The default no dmt bitrate minimum fast sets both the minimum downstream and upstream fastpath

bit rates to zero. This command does not cause the port to retrain.

Release Modification

12.0(5)DA This command was introduced in a previous release.

12.1(5)DA The fast keyword was added.

Usage Guidelines Only the alarm subsystem uses the minimum bit rate settings. Cisco IOS asserts an alarm if the line card

trains at a rate below the configured minimum bit rate. However, no alarm occurs when you disable alarms. See alarms in the Command Reference for Cisco DSLAMS with NI-2, for more information on enabling and disabling alarms.

If alarms are enabled for the profile,setting the DMT bit rate to 0 disables the associated minimum DMT bit rate alarm.

Table 2 lists the allowable DMT bit rate ranges and default values.

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dmt bitrate

Table 2 Allowable Ranges and Default Values for DMT Bit Rates

Downstream Upstream

Configuration Parameter

Data Path

Aggregate Range (kbps)

Path Range (kbps)

Path Default (kbps)

Aggregate Range (kbps)

Path Range (kbps)

Path Default (kbps)

DMT bit rate max Fast 8064 to 32 8064 to 32 0 864 to 32 864 to 0 0 DMT bit rate min Fast 8064 to 32 8064 to 0 0 864 to 32 864 to 0 0 DMT bit rate max Interleaved 8064 to 32 8064 to 32 640 864 to 32 864 to 0 128 DMT bit rate min Interleaved 8064 to 32 8064 to 0 128 864 to 0 864 to 0 0

Caution This command causes the port to retrain when you change the value of the bit rate parameter.

Setting a parameter to its current value does not cause a retrain. If a port is training when you change the parameter, the port stops training and retrains to the new parameter.

Examples In this example, the command sets the maximum interleaved bit rate of the default profile to 3200 kbps

downstream and 640 kbps upstream:

DSLAM# configure terminal DSLAM(config)# dsl-profile default DSLAM(config-dsl-prof)# dmt bitrate maximum interleaved downstream 3200 upstream 640

Related Commands

Command Description

show dsl profile Display a specificprofile,all ports to which the profile is currently attached,

and those port settings.

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dmt check-bytes

To set upstream and downstream FEC check (redundancy) bytes, use the dmt-checkbytes profile configuration command. To reset this command to the default value, use the no form of this command.

dmt check-bytes {fast | interleaved} downstream bytes upstream bytes

dmt check-bytes

Syntax Description

bytes Enter the upstream and downstream FEC check bytes. The allowed values

fast Specify the DMT fast latency path. interleaved Specify the DMT interleaved latency path.

Defaults Downstream: 16

Upstream: 16

Command Modes Profile configuration.

Command History

Release Modification

12.0(5)DA This command was introduced.

12.1(6)DA The fast keyword was added.

Usage Guidelines

are 0, 2, 4, 6, 8, 10, 12, 14, and 16.

Caution This command causes the port to retrain when you change the check-bytes parameter.

Setting a parameter to its current value does not cause a retrain. If a port is training when you change the parameter, the port untrains and retrains to the new parameter.

Conditions on the line, the configured bit rate, and the capabilities of the ATU-R CPE affect the achievable value for this parameter. As a result, the check-bytes value to which the line trains may be smaller than the value you configure. If you want to use more check bytes than the system is allowing you, use the dmt bitrate command to reduce the bit rate.

Use the command show dsl interface atm slot#/port# to display the configured and actual check-bytes values for the connection.

Examples In this example, the command sets the interleaved FEC check-bytes for the default profile to

12 downstream and 6 upstream.

DSLAM# configure terminal DSLAM(config)# dsl-profile default DSLAM(config-dsl-prof)# dmt check-bytes interleaved downstream 12 upstream 6

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Related Commands None.

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dmt margin

To set upstream and downstream signal-to-noise ratio (SNR) margins for a DMT profile, use the dmt margin command. To reset this command to the default value, use the no form of this command.

dmt margin downstream dmt-margin upstream dmt-margin

Syntax Description

dmt-margin Enter the upstream and downstream SNR margins in decibels. The range is

Defaults Downstream: 6 dB

Upstream: 6 dB

Command Modes Profile configuration.

Command History

Release Modification

12.0(5)DA This command was introduced.

Usage Guidelines

Caution This command causes the port to retrain when you change the parameter.

Setting a parameter to its current value does not cause a retrain. If a port is training when you change this value, the port untrains and retrains to the new value.

0 to 15.

Examples In this example, the command sets the SNR margins of the default profile to 12 dB downstream and

6 dB upstream:

DSLAM# configure terminal DSLAM(config)# dsl-profile default DSLAM(config-dsl-prof)# dmt margin downstream 12 upstream 6

Related Commands None.

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dmt minrate-blocking

To force a port not to retrain when actual bit rates fall below the values configured in the dmt bitrate minimum command, use the dmt minrate-blocking command. To disable dmt minrate-blocking, use the no form of the command.

dmt minrate-blocking

Syntax Description This command has no arguments or keywords.

Defaults The default configuration, no dmt minrate-blocking, generates a minor alarm when the bit rates on a

DMT port violate the minimum allowed bit rates specified in the dmt bitrate minimum command (if alarms are enabled in the DSL profile).

Command Modes DSL profile configuration.

Command History

Release Modification

IOS 12.1(6)DA This command was introduced.

Usage Guidelines To specify the bit rate below which a DMT port will not retrain, use the dmt bitrate

minimum command.

Examples The following example describes how to enable dmt minrate-blocking:

configure terminal

dsl-profile 8xDMT

dmt minrate-blocking

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dmt overhead-framing

To set the overhead framing mode, use the dmt overhead-framing command.Toreset this command to the default value, use the no form of this command.

dmt overhead-framing {mode0 | mode1 | mode2 | mode3}

dmt overhead-framing

Syntax Description

mode0 Full overhead framing with asynchronous bit-to-modem timing. mode1 Full overhead framing with synchronous bit-to-modem timing. mode2 Reduced overhead framing with separate fast and sync bytes in the fast and

mode3 Reduced overhead framing with merged fast and sync bytes, using either the

Defaults Mode3.

Command Modes Profile configuration.

Command History

Release Modification

12.0(5)DA This command was introduced.

12.1(6)DA Mode 0 was added.

Usage Guidelines

interleaved latency buffers respectively.

fast or interleaved latency buffer.

Note Conditions on the line and the capabilities of the ATU-R CPE affect the achievable value for this

parameter. As a result, the overhead framing value to which the line trains may not be the same as the value you configure.

There are two types of ADSL framing:

• Full overhead

• Reduced overhead

There are also two versions of full overhead:

• Asynchronous

• Synchronous

You select the type of ADSL framing by choosing one of four modes:

• Mode 0—Full overhead framing with asynchronous bit-to-modem timing (an enabled

synchronization control mechanism).

• Mode 1—Full overhead framing with synchronous bit-to-modem timing (a disabled synchronization

control mechanism).

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dmt overhead-framing

• Mode 2—Reduced overhead framing with separate fast and sync bytes in the fast and interleaved

latency buffers respectively.

• Mode 3—Reduced overhead framing with merged fast and sync bytes using either the fast or

interleaved latency buffer.

Note Mode 3 is recommended for use on DMT interfaces adhering to the ANSI T1.413 Issue 2 standard.

Mode 3 is required for flexi line card DMT interfaces.

The number of overhead bytes per frame varies according to the overhead framing mode and the operating mode, as shown in Table 3.

Table 3 Overhead Bytes per Frame

Overhead Bytes T1.413 and G992.1 G992.2

Framing Mode

Downstream Upstream Downstream Upstream

Mode 0 4 3 N/A N/A Mode 1 3 3 N/A N/A Mode 2 2 2 N/A N/A Mode 3 1 1 1 1

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If, during the training sequence, the ATU-R indicates a lower framing structure than that specified by the ATU-C, the ATU-C falls back to the framing structure number indicated by the ATU-R.

Management requirements drive the determination of overhead, full or reduced. Full overhead provides more bandwidth to the embedded operations channel (EOC), enabling higher polling rates. However, reduced overhead provides enough EOC bandwidth to satisfy typical applications.

The dmt overhead-framing command does not cause port retrain when you change the parameter.

Examples In this example, the command sets the overhead framing mode in the profile named 8xDMT.

DSLAM# configure terminal DSLAM(config)# dsl-profile 8xDMT DSLAM(config-dsl-prof)# dmt overhead-framing mode2

Related Commands

Command Description

show dsl profile Display a specificprofile,all ports to which the profile is currently attached,

and those port settings.

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Octal-Port DMT ATU-C Line Card

dmt rate-adaptation enable

DMT rate adaptation monitors upstream and downstream DMT ports for signal-to-noise ratio (SNR) margins during specified time intervals. If an unacceptable SNR margin is detected, the port is retrained at a lower bit rate to improve the SNR margins. To enable rate adaptation on a DMT port, use the dmt rate-adaptation enable command at the DSL profile configuration prompt. To disable dmt rate adaptation, use the no form of the command.

dmt rate-adaptation enable

This command has no arguments or keywords.

Defaults Enabling dmt rate-adaptation configures the commands dmt rate-adaptation interval and

dmt rate-adaptation margin with their default values. For information on the default values of dmt rate-adaptation interval and dmt rate-adaptation margin see the “dmt rate-adaptation interval”

section on page 22 and the “dmt rate-adaptation margin” section on page 24.

Command Modes DSL profile configuration

Command History

Release Modification

IOS 12.1(6)DA This command was introduced.

Usage Guidelines If you wish to modify the default configuration of the dmt rate-adaptation interval and

dmt rate-adaptation margin see the “dmt rate-adaptation interval” section on page 22 and the “dmt

rate-adaptation margin” section on page 24.

Examples The following example enables dmt rate-adaptation with default interval and margin values:

config terminal

dsl-profile austin

dmt rate-adaptation enable

Related Commands

Command Description

dmt rate-adaptation interval Sets the upstream and downstream time intervals at which a DMT

port is monitored for SNR margins.

dmt rate-adaptation margin Sets the SNR values below which the DMT port retrains to a lower

bit rate.

Cisco IOS Release 12.1(6)DA

dmt rate-adaptation interval

To change the intervals during which a DMT port is monitored for signal-to-noise ratio (SNR) margins, use the dmt rate adaptation interval command in DSL profile configuration mode. To disable

dmt rate adaptation interval, use the no form of this command.

dmt rate-adaptation interval {downshift [downstream number-of eoc-updates

upstream seconds]}

Octal-Port DMT ATU-C Line Card

Syntax Description

downshift The downshift keyword indicates that a line with excessive SNR margins retrains

to a lower bit rate.

downstream The downstreamkeyword tells IOS to monitor downstream ports for SNR margins

exceeding those specified in the dmt rate-adaptation margin command.

number-of eoc-updates

upstream The upstream keyword tells IOS to monitor upstream ports for SNR margins

seconds The seconds argument specifies the monitoring interval in seconds on an upstream

The number-of eoc-updates argument specifies the monitoring interval in multiples of six seconds on a downstream DMT port.

Note The downstream margin (see “dmt rate-adaptation margin” section on

page 24) is obtained from the CPE via the embedded operations channel

(EOC). The downstream number-of eoc-updates parameter specifies a number of consecutive EOC read events. Depending upon the type of CPE, EOC messages are sent once every 6 to 15 seconds (not counting EOC timeouts). Hence, a downstream downshift interval value of 10 on CPE reporting margins every6 seconds results in a 1 minute monitoring interval (10x6 seconds). Specifying a downstream downshift interval value of 10 on CPE that report margins every 15 seconds (10x15 seconds) yields a 2.5 minute monitoring interva1.

exceeding those specified in the dmt rate-adaptation margin command.

DMT port.

Defaults Following are the default settings for the dmt rate adaptation interval:

• downstream—10

Note Remember, a downstream value of 10 can yield a monitoring interval between 1 minute to

2.5 minutes in length.

• upstream—10

Command Modes DSL profile configuration

Command History

Cisco IOS Release 12.1(6)DA

Release Modification

IOS 12.1(6)DA This command was introduced.

Octal-Port DMT ATU-C Line Card

dmt rate-adaptation interval

Usage Guidelines Use the dmt rate-adaptation interval to specify the frequency at which line margins are checked on a

DMT port. The dmt rate-adaptation interval command works in conjunction with the dmt rate-adaptation margin command. If the actual SNR margins on a port remain lower than the

margins configured in the dmt rate-adaptation margin command, for the duration of time specified in the dmt rate-adaptation interval command, the line drops and retrains to a lower bit rate, to improve SNR margin quality on the line.

Note If line conditions improve, the line does not automatically drop and retrain to a higher bit rate. If the

line conditions improve, the administrator must execute a shut then a no shut on the port to retrain to a higher bit rate.

Examples The following example configures a downstream monitoring interval of roughly 60 to 150 seconds. The

upstream monitoring interval is 20 seconds.

config terminal

dsl-profile austin

dmt rate-adaptation interval downshift downstream 10 upstream 20

Related Commands Command Description

dmt rate-adaptation enable Turns on rate adaptation. dmt rate-adaptation margin Sets the SNR margins below which a DMT port retrains to a lower

bit rate.

Cisco IOS Release 12.1(6)DA

dmt rate-adaptation margin

To configure the minimum acceptable SNR margins on a DMT port, which force the port to retrain when bad margins exist for the duration of the dmt rate-adaptation interval, use the dmt rate adaptation

margin command in DSL profile configuration mode. To disable dmt rate adaptation margin use the no form of this command.

dmt rate-adaptation margin {min [downstream dB upstream dB]}

Octal-Port DMT ATU-C Line Card

Syntax Description

Defaults The default configuration is derived from the no dmt rate-adaptation enable command. This specifies

Command Modes DSL profile configuration

Command History

min The min keyword specifies that you are configuring the minimum

acceptable SNR margins on a port. If the port SNR exceeds the configured value, the port retrains to a lower bit rate.

downstream Specifies the minimum acceptable SNR margin for downstream traffic on

a port.

dB SNR margins measured in decibels. The valid range is –15 to 15. upstream Specifies the minimum acceptable SNR margin for upstream traffic on

a port.

dB SNR margins measured in decibels. The valid range is -15 to 15.

minimum upstream and downstream SNR margins of 0 dB.

Release Modification

IOS 12.1(6)DA This command was introduced.

Usage Guidelines Use the dmt rate-adaptation margin command to configure the acceptable SNR margin thresholds on

a specified port. The dmt rate-adaptation margin command works in conjunction with the dmt rate-adaptation interval command. If the actual SNR margins on a port remain lower than the margins configured in the dmt rate-adaptation margin command, for the duration of time specified in the dmt rate-adaptation interval command, the line drops and retrains to a lower bit rate, to improve SNR margin quality on the line.

Note If line conditions improve, the line does not automatically drop and retrain to a higher bit rate. If the

line conditions improve, the administrator must execute a shut then a no shut on the affected port to retrain to a higher bit rate.

Cisco IOS Release 12.1(6)DA

Octal-Port DMT ATU-C Line Card

slot

To provision a slot for a specific card type, or to change the line coding for a flexi line card, use the

slot command.

slot slot# cardtype

Syntax Description

slot# The number of the slot you want to provision. The range is 1 to 38.

Note The number of slots varies by chassis. The Cisco 6130 has

38 slots, the Cisco 6160 has 34 slots, and the Cisco 6260 has 32 slots.

cardtype The line card type for which you want to configure the slot. The

valid card types are

• ATUC-1-4DMT—4-port DMT card

• ATUC-1-4DMT-I—4-port DMT over ISDN card

• ATUC-4FLEXICAP—4-port flexi card configured as CAP

• ATUC-4FLEXIDMT—4-port flexi card configured as DMT

• ATUC-1-DMT8—8-port DMT card

• ITUC-1-8IDSL—8-port IDSL card

• STUC-4-2B1Q-DIR-1—4-port SDSL card

Note Some line cards do not function in all NI-2 DSL systems.

For example, the Cisco 6100 system supports only a dual-port CAP ATU-C line card. Consult the hardware documentation for your DSL system to determinewhich line cards it supports.

Defaults None.

Command Modes Global configuration.

Command History

Release Modification

12.0(5)DA This command was introduced.

12.1(1)DA New card types were added.

12.1(6)DA New card types were added.

Cisco IOS Release 12.1(6)DA

slot

Usage Guidelines Use the slot command to provision a slot for a line card.

Card mismatch error conditions include the following:

• A line card is already installed in the specified slot

• The specified slot contains one type of card but is provisioned for another type

If you attempt to provision an empty slot, the major alarm “MODULE-MISSING” asserts. The 8xDMT line card is spectrally incompatible with both the 8-port IDSL line card and the 4-port SDSL

(STU-C) line card. If you install spectrally incompatible cards in the same chassis, the lines served by those cards can suffer reduced performance. Forbest performance in a chassis with a mixture of line card types, always install 8xDMT line cards on one side of the chassis and install IDSL and SDSL cards on the opposite side.

Examples The command in this example provisions slot 30 for an 8xDMT line card.

DSLAM# configure terminal DSLAM(config)# slot 30 ATUC-1-DMT8

Octal-Port DMT ATU-C Line Card

Related Commands Command Description

show hardware Display information about the physical modules in the chassis.

Cisco IOS Release 12.1(6)DA

Octal-Port DMT ATU-C Line Card

Glossary

ADSL

ADSL Transmission Unit—central office

ADSL Transmission Unit—remote

asymmetric digital subscriber line

Asynchronous Transfer Mode

ATM

ATU-C

ATU-R

Asymmetric Digital Subscriber Line. A digital subscriber line (DSL) technology in which the transmission of data from server to client is much faster than the transmission from the client to the server.

See ATU-C.

See ATU-R.

See ADSL.

See ATM.

Asynchronous Transfer Mode. A cell-based data transfer technique in which channel demand determines packet allocation. ATMoffers fast packet technology, real time, demand led switching for efficient use of network resources.

ADSL Transmission Unit—central office. ADSL Transmission Unit—remote.

CBOS

CCO

chassis

Cisco Connection Online

CLI

CPE

CTC

DMT

Cisco Broadband Operating System. Operating System that users access to configure and operate the Cisco products.

Cisco Connection Online. The card cage (housing) where modules are placed. See CCO.

Command Line Interface. customer premises equipment. Common Transmit Clock.

Discrete Multitone.

Cisco IOS Release 12.1(6)DA

Glossary

Octal-Port DMT ATU-C Line Card

DDTS

digital signal level 3

Distributed Defect Tracking System

DS3

DSLAM

frame

FTP

Cisco Distributed Defect Tracking System. See DS3. See DDTS.

digital signal level 3. Framing specification used for transmitting digital signals at 44.736 Mbps on a T3 facility.

Digital Subscriber Line Access Multiplexer. Concentrates and multiplexes digital subscriber line signals at the telephone service provider location to the broadband wide area network. Replaces ADSLAM.

A packet as it is transmitted over a serial line. The term derives from character oriented protocols where special start-of-frame and end-of-frame characters were added when transmitting packets.

File Transfer Protocol. The Internet protocol (and program) used to transfer files between hosts.

G.992.2

G.994.1

G.997.1

G.dmt G.hs

G.lite

Handshake

The ITU standard for line coding and framing for splitterless, reduced spectrum ADSL. Also known as G.lite.

The ITU standard for signalling, identification, and negotiation between broadband systems; an integral part of G.dmt and G.lite. Also known as G.hs.

The ITU standard for performance monitoring on DMT access technologies. Pseudonym for G.992.1. Pseudonym for G.994.1. HandShake (hs) Pseudonym for G.992.2

Part of the procedure to set up a data communications link. The handshake can be part of the protocol itself or an introductory process. The computers wishing to talk to each other set out the conditions they can operate under. Sometimes, the handshake is just a warning that a communication is imminent.

Internet Protocol. The network layer protocol for the Internet Protocol suite.

Cisco IOS Release 12.1(6)DA

Octal-Port DMT ATU-C Line Card

Glossary

IP address

ITU

LCD

LODS

LOF

loopback

LOS

Management Information Base

The 32-bit address assigned to hosts that want to participate in a TCP/IP Internet. The International Telecommunications Union; a telecommunications standards body.

Loss of Cell Delineation Loss Of Delay Synchronization Loss Of Frame. A diagnostic test that returns the transmitted signal back to the sending device after it has passed

through a network or across a particular link. The returned signal can then be compared to the transmitted one. The discrepancies between the two help to trace the fault. When trying to locate a faulty piece of equipment, loopbacks will be repeated, eliminating satisfactory machines until the problem is found.

loss of signal.

See MIB.

MIB

NI-2

PVC

route

Management Information Base. A collection of objects that can be accessed via a network management protocol, such as SNMP and CMIP (Common Management Information Protocol).

A second generation network interface card.

Stands for permanent virtual connection. A fixed virtual connection between two users: The public data network equivalent of a leased line. No call setup or clearing procedures are needed.

The path that network traffic takes from its source to its destination. The route a datagram may follow can include many gateways and many physical networks. In the Internet, each datagram is routed separately.

Cisco IOS Release 12.1(6)DA

Glossary

Octal-Port DMT ATU-C Line Card

router

routing table

Simple Network Management Protocol

slot

SNMP

SVC

TCP

A system responsible for making decisions about which of several paths network (or Internet) traffic will follow. Todo this, it uses a routing protocol to gain information about the network and algorithms to choose the best route based on several criteria known as “routing metrics.” See also bridge.

Information stored within a router that contains network path and status information. It is used to select the most appropriate route to forward information along.

See SNMP.

A numbered location within a chassis capable of housing a module. Simple Network Management Protocol. The network management protocol of choice for

TCP/IP-based internets. Stands for switched virtual connection. A temporary virtual connection between two users.

Transmission Control Protocol. The major transport protocol in the Internet suite of protocols providing reliable, connection-oriented full-duplex streams.

T1.413

Telnet

TFTP

training

training mode

Transmission Control Protocol

Trivial File Transfer Protocol

trellis encoding

twisted pair

The ANSI standard for line coding and framing for full rate ADSL. The virtual terminal protocol in the Internet suite of protocols. Allows users of one host to log into a

remote host and act as normal terminal users of that host. TrivialFile Transfer Protocol. A simple filetransfer protocol (a simplified versionof FTP) that is often

used to boot diskless workstations and other network devices such as routers over a network (typically a LAN). Has no password security.

The procedure used by the ATU-C and ATU-R to establish an end-to-end ADSL connection. Characteristic of a router that allows it to use RADSL technology to adjust its line speed according to

noise conditions on the transmission line. See TCP.

See TFTP.

A channel coding technique which provides forward error correction capability. Two insulated copper wires twisted together with the twists or lays varied in length to reduce potential

signal interference between the pairs.

Cisco IOS Release 12.1(6)DA

Octal-Port DMT ATU-C Line Card

Glossary

upstream rate

virtual circuit

VCI

VPI

The line rate for message or data transfer from the source machine to a destination machine on the network. Also see downstream rate.

Virtual circuit. A logical circuit created to ensure reliable communication between two network devices.A virtual circuit is definedby a VPI/VCI pair, and can be either permanent (PVC) or switched (SVC). In ATM,a virtual circuit is called a virtual channel. Sometimes abbreviated VC. See also PVC, SVC, VCI, and VPI.

See VC. Virtualchannel identifier. A 16-bit fieldin the header of an ATM cell. The VCI, together with the VPI,

is used to identify the next destination of a cell as it passes through to the ATM switch. Sometimes called virtual channel connection. See also VPI.

Virtualpath identifier. An 8-bit field in the header of an ATM cell. The VPI, together with the VCI, is used to identify the next destination of a cell as it passes through the network. See also VCI.

Cisco IOS Release 12.1(6)DA

Glossary

Octal-Port DMT ATU-C Line Card

Cisco IOS Release 12.1(6)DA

Cisco Systems Octal-Port DMT ATU-C Line Card User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Feature Overview

Benefits

Restrictions

Related Features and Technologies

Related Documents

Supported Platforms

Supported Standards, MIBs, and RFCs

Prerequisites

Configuration Tasks

Preprovisioning the 8xDMT Line Card

Verifying the Preprovisioned Slot

Creating and Associating a DSL Profile with Each Port

Verifying the DSL Profiles

Modifying the DSL Profile

Monitoring and Maintaining the 8xDMT Line Card

Troubleshooting Tips

Configuration Examples

Command Reference

Glossary