System information

Configuring the CMTS
6-35
Configuring the Upstream Channel Descriptor
Follow the steps in this section to configure the upstream channel descriptor (UCD).
1. To disable the upstream channel, use the cable upstream shutdown command in
Interface Configuration mode, as shown below:
MOT(config-if)#cable upstream <NUM> shutdown
where:
NUM is the upstream port number.
2. The default UCD message transmission interval is 1000 milliseconds. If you want
to adjust this parameter, use the cable ucd-interval command in Interface
Configuration mode to set the UCD message transmission interval, as shown
below:
MOT(config-if)#cable ucd-interval <0-2000>
where:
0-2000 is the maximum UCD message transmission interval in milliseconds.
3. To display the configured ucd interval value, use the show cable ucd-interval
command in Interface Configuration mode, as shown below:
MOT(config-if)#show cable ucd-interval
4. To re-enable the upstream channel, use the no cable upstream shutdown
command in Interface Configuration mode, as shown below:
MOT(config-if)#no cable upstream <NUM> shutdown
where:
NUM is the upstream port number.
Limiting the Number of Voice Calls on an Upstream Channel
The Maximum Assigned Bandwidth (MAB) feature is used on the cable interface to
regulate the number of Voice-over-IP (VOIP) calls that are available on a particular
upstream channel for Unsolicited Grant Service (UGS) and Unsolicited Grant Service
with Activity Detection UGS-AD constant bit rate (CBR) data flows. A definitive
limit on the number of voice calls ensures that bandwidth resources are not overused
on an upstream channel.