Verifying The Bert Configuration For T3 Interfaces; Loopback On T1/T3 Interfaces - Cisco ASR 900 Series Configuration Manual

Configuring T3 Interfaces
To terminate a BERT test during the specified test period, use the no bert command.
Note
You can view the results of a BERT test at the following points of time:
• After you terminate the test using the no bert command
• After the test runs completely
• Anytime during the test (in real time)

Verifying the BERT Configuration for T3 Interfaces

Use the show controller command to verify the BERT configuration for clear channel T3 interfaces:
# show controllers t3 0/4/12 | sec BERT
BERT test result (running)
Running Bit Error Rate Testing
Test Pattern : 2^15, Status : Not Sync, Sync Detected : 0
DSX3 BERT direction : Line
Interval : 5 minute(s), Time Remain : 3 minute(s)
Bit Errors (since BERT started): 0 bits,
Bits Received (since BERT started): 0 Kbits
Bit Errors (since last sync): 0 bits
Bits Received (since last sync): 0 Kbits
Use the show controller command to verify the BERT configuration of channelized T3/T1 interfaces interfaces:
# show controllers t3 0/4/12
T1 1 is up
No alarms detected.
Framing is unframed, Clock Source is Internal
BERT test result (running)
Test Pattern : 2^23, Status : Not Sync, Sync Detected : 0
DSX1 BERT direction : Line
Interval : 5 minute(s), Time Remain : 4 minute(s)
Bit Errors (since BERT started): 0 bits,
Bits Received (since BERT started): 0 Kbits
Bit Errors (since last sync): 0 bits
Bits Received (since last sync): 0 Kbits

Loopback on T1/T3 Interfaces

You can use the following loopback on the clear and channelized T3/T1 interfaces.
Loopback
loopback local
loopback network line
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco IOS
Running Bit Error Rate Testing
Description
Loops the transmitting signal back to the receiver.
Loops the incoming signal back to the interface using
the line loopback mode of the framer. The framer
does not reclock or reframe the incoming data. All
incoming data is received by the interface driver.
XE Fuji 16.7.x (Cisco ASR 900 Series)
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