Cisco Broadband Cable Command Reference Guide

cable upstream channel-width
cable upstream channel-width
Syntax Description
Defaults 1,600,000 Hz
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Cisco Broadband Cable Command Reference Guide
Chapter 2 Cisco Cable Modem Termination System Commands
To specify an upstream channel width for an upstream port, use the cable upstream channel-width
command in cable interface configuration mode. To set the channel width back to the default setting of
1,600,000 Hz, use the no form of this command.
cable upstream n channel-width first-choice-width [last-choice-width]
no cable upstream n channel-width
Command Modes Interface configuration (cable interface only)
Command History
n Specifies the upstream port number. Valid values start with 0 for the
first upstream port on the cable interface line card.
first-choice-width Specifies upstream channel width in hertz (Hz). Valid values are:
200,000 (160,000 symbols/sec), 400,000 (320,000 symbols/sec),
800,000 (640,000 symbols/sec), 1600,000 (1,280,000 symbols/sec),
and 3,200,000 (2,560,000 symbols/sec).
last-choice-width (Cisco uBR-MC16S only) The upstream channel width in hertz. The
valid values are the same as those for the first-choice-width parameter.
Use this parameter with the Cisco uBR-MC16S cable interface line
card to enable symbol rate management algorithms. The symbol rate
automatically steps up from the first-choice-width value to the highest
value until a stable channel is established.
Usage Guidelines The last-choice-width parameter is supported only by the Cisco uBR-MC16S cable interface line card.
When the Cisco uBR-MC16S card is installed, the system attempts to increase the channel width from
the smallest channel width value to the largest channel width value, one step at a time.
Note To specify only one channel width for the Cisco uBR-MC16S card, specify the same value for both the
first-choice-width and last-choice-width parameters. For example:
cable upstream 0 channel-width 800000 800000
Note The last-choice-width argument is applicable only to the
Cisco uBR-MC16S card.
Release Modification
11.3(5)NA This command was introduced.
12.0(4)XI The last-choice-width argument was added.
OL-1581-05