6-6
Cisco 10000 Series Router Troubleshooting Guide
OL-0439-02
Chapter 6 Troubleshooting Serial Lines
Using Loopback Tests
Note Unless unframed is selected, the BER test runs over the configured framing option for the specified T1
line (ESF or SF). Before running a BER test, you should configure the framing option that is appropriate
to your application.
Terminating a BER test
To terminate a BER test, type:
no t1
t1-line-number
bert
where: t1-line-number is 1–28.
Examples:
• Terminate the BER test running on T1 line 10 on the CT3 line card.
Router(config)# controller T3 1/0/0
Router(config-controller)# no t1 10 bert
Using Loopback Tests
The following sections describe the configuration and use of loopback tests in problem isolation:
• Configuring the Loopback Mode for a T3 Controller, page 6-7
• Configuring a T3 Controller to Respond to Remote Loopback Commands, page 6-7
• Configuring the Loopback Mode for a Gigabit Ethernet Interface, page 6-8
• Configuring the Loopback Mode for an OC-12 POS Interface, page 6-8
Interval : 5 minute(s), Time Remain
: 5 minute(s)
Indicates the time the test takes to run and the time
remaining for the test to run.
If you terminate a BER test, you receive a message similar
to the following:
Interval : 5 minute(s), Time Remain : 2
minute(s) (unable to complete)
“Interval: 5 minutes” indicates the configured run time for
the test. “Time Remain : 2 minutes” indicates
the time
remaining in the test prior to termination. “(Unable to
complete)” signifies that you interrupted the test.
Bit Errors(Since BERT Started):
6 bits,
Bits Received(Since BERT start):
8113 Kbits
Bit Errors(Since last sync): 6 bits
Bits Received(Since last sync):
8113 Kbits
These four lines show the bit errors that have been detected
versus the total number of test bits that have been received
since the test started and since the last synchronization was
detected.
Table 6-2 Interpreting BER Test Results (continued)
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