User guide

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Configuration Guide for Cisco DSLAMs with NI-2
OL-2074-03
Chapter 4 Configuring Digital Subscriber Lines
Setting DSL Profile Parameters
To set the training mode of a DMT profile to its default value, follow these steps:
The above procedures specify the mode employed by the ATU-C port when it is training to an ATU-R CPE.
There are two training modes:
• Standard—This mode uses the G.994.1 or T1.413-1998 initialization sequence depending on
configuration. In standard training mode the ATU-C port trains with the modem once, and if
the configured rates and settings are not obtainable, the line card reads the line quality and retrains,
selecting the best available rates and settings. This mode allows more control over DMT parameters.
• Quick—This mode is the default. It uses the extended exchange sequence for T1.413-1998
initialization or the G.994.1 initialization, depending on configuration. In quick training mode the
modem DSP automatically determines the best available rate based on the parameters provided. The
DSP may be forced to change some of the configuration settings based on the line characteristics.
This training mode is faster than the standard mode.
This command does not retrain the port when you change the parameter value.
Example
This example sets the training mode of the default profile to quick and displays the results:
DSLAM# configure terminal
DSLAM(config)# dsl-profile default
DSLAM(cfg-dsl-profile)# dmt training-mode quick
DSLAM(cfg-dsl-profile)# end
DSLAM# show dsl profile default
dsl profile default:
Link Traps Enabled: NO
Alarms Enabled: YES
ATM Payload Scrambling: Enabled
DMT profile parameters
Maximum Bitrates:
Interleave Path: downstream: 640 kb/s, upstream: 128 kb/s
Fast Path: downstream: 0 kb/s, upstream: 0 kb/s
Minimum Bitrates:
Interleave Path: downstream: 0 kb/s, upstream: 0 kb/s
Fast Path: downstream: 0 kb/s, upstream: 0 kb/s
Margin: downstream: 6 dB, upstream: 6 dB
Interleaving Delay: downstream: 16000 usecs, upstream: 16000 usecs
Check Bytes (FEC):
Interleave Path: downstream: 4, upstream: 6
Fast Path: downstream: 0, upstream: 0
RS Codeword Size: downstream: 16, upstream: 8
Trellis Coding: Disabled
Overhead Framing: Mode 2
Operating Mode: Automatic
Command Task
Step 1
DSLAM# configure terminal
Go to global configuration mode.
Step 2
DSLAM(config)# dsl-profile profile-name
Go to profile configuration mode and specify the
profile-name for which you want to modify the
training mode.
Step 3
DSLAM(cfg-dsl-profile)# no dmt training-mode
Set the training mode to its default value.
Step 4
DSLAM(cfg-dsl-profile)# end
Exit from profile configuration mode.