System information

BSR 64000 Configuration and Management Guide
6-14
where:
64 is 64 Quadrature Amplitude Modulation (QAM).
256 is 256 (QAM).
To restore the default, use the no cable downstream modulation command in
Interface Configuration mode, as shown below:
MOT(config-if)#no cable downstream 0 modulation [64 | 256]
Enforcing the Downstream Rate Limit
Use the cable downstream rate-limit command to enable the downstream data
transmission rate-limit to CMs on the HFC network. Once the downstream data
transmission rate-limit function is enabled, data sent from the cable interface to the
CMs is rate-limited according to each CM configuration. For example, a CM may
drop packets when the data from the network exceed the permitted bandwidth of the
CM. Follow the steps in this section to enable the downstream rate-limit for CMs:
1. Edit the CM configuration file to set the downstream data rate limit.
2. To enable the rate-limiting function, use the cable downstream rate-limit
command in Interface Configuration mode, as shown below:
MOT(config-if)#cable downstream rate-limit
To disable the downstream rate-limiting function, use the no cable downstream
rate-limit command.
3. To verify that downstream rate-limiting is enabled or disabled on the cable
interface, use the show running-config command in Privileged EXEC mode, as
shown below:
MOT#show running-config
4. Use the show cable qos svc-flow statistics command in Privileged EXEC mode
to determine the number of dropped packets due to downstream rate-limiting for
a particular service flow, as shown below:
MOT#show cable qos svc-flow statistics {<x>/<y>} [<1-4292967295> | <cr>]
where:
x is the slot number of the cable module.
y is the cable interface number, which is 0.