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.

Cisco IOS Release 12.1(6)DA

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

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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.

Cisco IOS Release 12.1(6)DA

Octal-Port DMT ATU-C Line Card

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.

Cisco IOS Release 12.1(6)DA

Octal-Port DMT ATU-C Line Card

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

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

adslAtucDmtConfInterleavePath,adslAtucDmtConfFastPath,adslAturDmtConfInterleavePath, adslAturDmtConfFastPath.

Supported Standards, MIBs, and RFCs

Cisco-Derived MIBS

• CISCO-ADSL-LINE-MIB

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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.

Cisco IOS Release 12.1(6)DA

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.

Cisco IOS Release 12.1(6)DA

Octal-Port DMT ATU-C Line Card

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.

Cisco IOS Release 12.1(6)DA

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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.

Cisco IOS Release 12.1(6)DA

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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

Cisco IOS Release 12.1(6)DA

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.

Octal-Port DMT ATU-C Line Card

Cisco IOS Release 12.1(6)DA

+ 22 hidden pages

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