System information

Configuring the CMTS
6-31
Adjusting for Physical Delay between Cable Interface and CMs
The physical delay function is used to adjust the upstream propagation delay
threshold between the cable interface and cable modems (CMs). The cable interface
adjusts the physical delay function automatically by default.
You can use the following options to adjust the physical delay function:
• A single fixed time can be set for physical delay.
• Physical delay parameters can be configured so that they are adjusted
automatically by the BSR when you specify the automatic option with a specified
minimum and maximum microsecond range.
• If you do not want to specify a range for the automatic option, select the
automatic option only.
Issue the cable upstream physical-delay automatic command in Interface
Configuration mode to set the automatic physical delay value for an upstream
channel, as shown below:
MOT(config-if)#cable upstream <NUM> physical-delay automatic
[<200-1600> | <200-1600> | <cr>]
where:
NUM is the upstream port number.
automatic indicates adjust the physical delay automatically.
200-1600 is the minimum upstream physical delay from microseconds.
200-1600 is the maximum upstream physical delay from 200 to 1600
microseconds.
cr is a command return used after the automatic parameter to specify that the
physical delay is adjusted automatically.
-or-
Issue the cable upstream physical-delay command in Interface Configuration mode
to set the fixed value for an upstream channel, as shown below:
MOT(config-if)#cable upstream <NUM> physical-delay {<200-1600>}