Cisco IOS Software Configuration for the
How to Configure the
set to internal on the local
clock source | clock source line |
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no | loopback network | no keepalive |
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[BERT Pattern] |
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Serial5/1 |
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[11.0.0.1] |
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Router(config)# interface serial 6/0
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 |
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BERT Pattern | To Invoke | Command | |
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2^15 |
| A pseudorandom repeating pattern | Router |
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| that is 32767 bits long |
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2^20 |
| A pseudorandom repeating pattern | Router |
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| that is 1048575 bits long |
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qrss 2^20 |
| A quasirandom signal source | Router |
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2^23 |
| A pseudorandom repeating pattern | Router |
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| that is 8388607 bits long |
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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)# end
Router#
Cisco IOS Release 12.0(8)S
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