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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
14
Cisco IOS Release 12.0(8)S
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.
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#
Table 6 DS3-Supported BERT Patterns
BERT Pattern To Invoke Command
2^15 A pseudorandom repeating pattern
that is 32767 bits long
Router (config-if)# bert pattern 2^15 interval 10
2^20 A pseudorandom repeating pattern
that is 1048575 bits long
Router (config-if)# bert pattern 2^20 interval 10
qrss 2^20 A quasirandom signal source Router (config-if)# bert pattern qrss
2^23 A pseudorandom repeating pattern
that is 8388607 bits long
Router (config-if)# bert pattern 2^23 interval 10