System information

Configuring the CMTS
6-19
Testing RF Carrier Modulation
The downstream carrier-only function is disabled by default and is used for testing
purposes only to control downstream output. To optionally enable this test function,
use the in Interface Configuration mode, as shown below.
MOT(config-if)#cable downstream <0-0> carrier-only
where:
0-0 is the downstream port number.
To disable the downstream carrier-only function, use the no cable downstream
carrier-only command.
Configuring an Upstream Channel
An upstream channel is configured to control the data flow from a CM to the cable
interface. This section is divided into two parts. The initial upstream parameters that
must be configured for the minimal operation of the upstream port are discussed in the
Initial Upstream Configuration Tasks section. The upstream parameters that are
configured to manage the upstream channel operation and performance are discussed
in the Managing the Upstream Channel section.
Note: The cable interface does not operate until a fixed upstream frequency
is set.