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 interleaving delay for a specific CAP profile, follow these steps:
To return the interleaved delay to its default (long) setting, follow these steps:
Examples
This example shows how to set the interleaving-delay value to none for the profile named “issis”:
DSLAM# configure terminal
DSLAM(config)# dsl-profile issis
DSLAM(cfg-dsl-profile)# cap interleaving-delay
DSLAM(cfg-dsl-profile)# end
This example shows how to set the default interleaving delay value for the profile named “issis”.
DSLAM# configure terminal
DSLAM(config)# dsl-profile issis
DSLAM(cfg-dsl-profile)# no cap interleaving-delay none
DSLAM(cfg-dsl-profile)# end
Setting the Number of Symbols per Reed-Solomon Codeword
This section describes how to set the number of symbols per Reed-Solomon codeword. This information
applies to DMT interfaces only.
The allowable values for configured symbols per codeword are 1, 2, 4, 8, 16, or auto. If you select auto
(automatic), the line card chooses the optimum symbols per codeword based upon the bit rate to which
the line trains. The optimum value keeps the ratio of user data to error correction bytes roughly constant.
The default symbols per codeword setting (the value assigned when a DSL profile is created) is auto for
both upstream and downstream directions.
If the symbols per codeword is set explicitly (any value other than auto), the DSLAM attempts to match
the configured symbols per codeword. However, depending upon the bit rate to which the port finally
trains, some settings of symbols per codeword may not be achievable. When this occurs, the DSLAM
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 set the interleaving delay.
Step 3
DSLAM(cfg-dsl-profile)# cap
interleaving-delay {short | long |
none}
Set interleaving-delay for a designated CAP profile.
Step 4
DSLAM(cfg-dsl-profile)# end
Return to privileged EXEC mode.
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 set the interleaving delay.
Step 3
DSLAM(cfg-dsl-profile)# no cap
interleaving-delay
Set interleaving-delay to the default value (long) for a designated CAP
profile.
Step 4
DSLAM(cfg-dsl-profile)# end
Exit from profile configuration mode.