Cisco Systems OC-12/STM-14 manual Checking Bit Errors Using a Bert, Bert Pattern To Invoke Command

Cisco IOS Software Configuration for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

How to Configure the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

set to internal on the local OC-12 controller in slot 1 with IP address 10.0.0.2. Clock source is set to line on the remote OC-12 controller in slot 1 with IP address 11.0.0.1. A BERT pattern is entered between local serial port 8/1 and remote serial port 5/1:

clock source internal----------	clock source line
no keepalive-------------------	loopback network line----------	no keepalive
Router:[gsr-1]-----------------	[mfr-1]
[BERT Pattern]
Serial8/1----------------------	Serial5/1
[11.0.0.2]---------------------	[11.0.0.1]

Router(config)# interface serial 6/0

Router(config-if)#bert pattern 2^23 interval 10

Router(config-if)#

Table 6 lists the BERT patterns, explains how to invoke them, and specifies test intervals between 1 and 1140 minutes long. The no bert pattern interface configuration command terminates an ongoing BER test and returns the local and remote DS3 serial ports to the default value.

Table 6	DS3-Supported BERT Patterns
BERT Pattern		To Invoke	Command
2^15		A pseudorandom repeating pattern	Router (config-if)#bert pattern 2^15 interval 10
		that is 32767 bits long
2^20		A pseudorandom repeating pattern	Router (config-if)#bert pattern 2^20 interval 10
		that is 1048575 bits long
qrss 2^20		A quasirandom signal source	Router (config-if)# bert pattern qrss
2^23		A pseudorandom repeating pattern	Router (config-if)#bert pattern 2^23 interval 10
		that is 8388607 bits long

Checking Bit Errors Using a BERT

Following is an example of the bert pattern command and specified time intervals that will cause the BERT to send the pseudorandom pattern 2^23 and repeat on the first DS3 channel for 10 minutes:

Router# configure terminal

Router(config)# interface serial 1/0:1

Router(config-if)#bert pattern 2^23 interval 10

Router(config-if)# end

Router(config)# end

Router#

Cisco IOS Release 12.0(8)S

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