Table of Contents
Advertisement
cable upstream maintain-psd
The default configuration (no cable upstream maintain-psd) configures TLV 15 to OFF, and CMs are
not required to maintain their power spectral density after a modulation rate change. However, per the
DOCSIS specifications, the CMs continue to maintain constant total input power on the upstream.
This command affects only DOCSIS 2.0 CMs that are online an upstream that is configured for the
Note
DOCSIS 2.0 A-TDMA-only mode. This command has no effect on DOCSIS 1.0 and DOCSIS 1.1 CMs,
which will continue to maintain constant total input power on the upstream, per the DOCSIS 1.x
specifications.
Examples
The following example shows how to configure four upstreams on a cable interface line card to require
cable modems to maintain a constant power spectral density after a modulation rate change.
Router# configure terminal
Router(config)# interface cable c6/1/0
Router(config-if)# cable upstream 0 maintain-psd
Router(config-if)# cable upstream 1 maintain-psd
Router(config-if)# cable upstream 2 maintain-psd
Router(config-if)# cable upstream 3 maintain-psd
Router(config-if)# exit
Router(config)# exit
Router#
The following example shows how to configure an upstream for the default behavior, which is that CMs
are not required to maintain a constant power spectral density after a modulation rate change, but do
continue to maintain constant total input power levels on the upstream.
Router# configure terminal
Router(config)# interface cable c5/1/0
Router(config-if)# no cable upstream 0 maintain-psd
Router(config-if)# exit
Router(config)# exit
Router#
Related Commands
Command
cable upstream docsis-mode
Cisco Broadband Cable Command Reference Guide
2-326
Chapter 2
Description
Configures an upstream to use either DOCSIS 1.x or
DOCSIS 2.0 modulation profiles.
Cisco CMTS Configuration Commands
OL-1581-08
Advertisement
Table of Contents
