Cisco Systems uBR7200 manual Verifying Cable Modem Insertion Interval, MC-589, Command, Purpose

Configuring Headend Broadband Access Router Features

Managing Cable Modems on the HFC Network

modem to join the network is known as initial ranging. The default insertion interval setting (automatic) configures the Cisco uBR7200 series to automatically vary the initial ranging times available to new cable modems that attempt to join the network.

Note Use the default setting if a large number of cable modems might attempt to perform initial ranging at the same time; for example, after a major power failure.

To configure the cable modem insertion interval, use one of the following commands in cable interface configuration mode:

Command		Purpose
CMTS01(config-if)#cable insertion-interval automatic		Configures the Cisco uBR7200 series to automatically
or		vary the initial ranging times available to new
		cable modems that attempt to join the network.
CMTS01(config-if)#cable insertion-interval min	msec	Sets the minimum insertion interval in milliseconds
or		(ms). Valid minimum range is from 25 to 200 ms.
		Default = 50 ms.
CMTS01(config-if)#cable insertion-interval max	msec	Sets the maximum insertion interval in milliseconds.
		Valid maximum range is from 500 to 2000 ms.
		Default = 2000 ms.

To ignore any minimum or maximum insertion intervals and return to the automatic setting, enter the no cable insertion-intervalcommand.

Verifying Cable Modem Insertion Interval

To verify that a cable modem insertion interval has been set, enter the more system:running-configcommand and look for a notation in the cable interface configuration information as shown in this command output excerpt:

CMTS01# more system:running-config

Building configuration...

Current configuration:

!

interface Cable6/0

ip address 1.1.1.1 255.255.255.0 no keepalive

cable insertion-interval 2000

cable downstream	annex B
cable downstream	modulation 64qam
cable downstream	interleave-depth 32
cable downstream	symbol-rate 5056941
cable upstream 0	frequency 15008000
cable upstream 0	fec
cable upstream 0	scrambler

no cable upstream 0 shutdown

Cisco IOS Multiservice Applications Configuration Guide

MC-589