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Cisco Router: Performing BER Test on a T1 Line in a Channelized DS3 |
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Articles and Blogs -
Cisco Encounter
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Written by Joel Gacosta
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This article shows how to configure a BER test on a T1 line in a channelized DS3. With BER tests, you can test cables and signal problems in the field. You can configure individual T1 channel groups to run an independent BER test.
To send a BER test pattern on a T1 line: t1 t1-line-number bert pattern pattern interval time [unframed]
- interval time is in minutes
- pseudorandom test patterns supported {2^11 | 2^15 |2^20}
- The unframed option causes the BERT pattern to use the entire T1 bandwidth including the T1 framing, as well as payload bits. Otherwise T1 will be either SF or ESF framed as configured by the T1 n framing configuration controller command.
Router(config)# controller T3 3/0
Router(config-controller)# t1 2 bert pattern 2^20 interval 5 unframed
You can display the results of a BER test using the show controllers t3 slot/port/t1-line-number controller command, where t1-line-number is 1 to 28.
Router# show controller t3 3/0/2:23
T3 3/0 is up. Hardware is GSR 6 port CT3
T1 1 is up
timeslots: 1-24
FDL per AT&T 54016 spec.
No alarms detected.
Framing is ESF, Clock Source is Internal
BERT test result (running)
Test Pattern : 2^11, Status : Sync, Sync Detected : 1
Interval : 5 minute(s), Time Remain : 5 minute(s)
Bit Errors (since BERT started): 6 bits,
Bits Received (since BERT started): 8113 Kbits
Bit Errors (since last sync): 6 bits
Bits Received (since last sync): 8113 Kbits
To Terminate and Cancel the BER test just negate the command:
Router(config)# controller T3 3/0
Router(config-controller)# no t1 2 bert
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