Installation guide

5-5
Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 5 Troubleshooting the System
Managing Cable Modems on the HFC Network
To deviate from system defaults when modifying the dynamic contention algorithm, use one of the
following commands in cable interface configuration mode.
Configuring the Dynamic Map Advance Algorithm
A CMTS administrator can enhance the upstream throughput from a cable modem connected to the
Cisco uBR7100 series CMTS. The system employs a new algorithm that automatically tunes the
lookahead time in MAPs based on several input parameters for the corresponding upstream channel. The
use of dynamic/optimal lookahead time in MAPs significantly improves the per-modem upstream
throughput.
Caution Only a trained CMTS administrator should adjust these values.
To configure the dynamic map advance algorithm, use the following command in cable interface
configuration mode.
Command Purpose
CMTS01(config-if)# [no] cable
insertion-interval automatic
CMTS01(config-if)# cable insertion-interval
automatic min 25-2000
CMTS01(config-if)# cable insertion-interval
max 500-2000
CMTS01(config-if)# no cable insertion-interval
CMTS01(config-if)# cable insertion-interval
100-2000
Disable or enable the dynamic ranging
interval algorithm. If lower and upper bounds
for varying the period are not specified, the
system uses default values of 50 msecs and 2
secs respectively.
Set the lower bound on the initial ranging
period for the auto ranging algorithm.
Set the upper bound on initial ranging period
for the auto ranging algorithm.
Reset fixed initial ranging period to default
value of 500 msecs. Also invokes fixed initial
ranging algorithm.
Enable fixed initial ranging period algorithm
with specified fixed period (msecs).