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Juniper Set Up a BERT Test on a T1 Interface
 
You want to run a bit error rate test (BERT) to test the quality of a T1 link.
First, configure the BERT test parameters on the local interface:
 
[edit interfaces t1-0/0/3 ]
source@RouterF# set t1-options bert-algorithm repeating-3-in-24 
source@RouterF# set t1-options bert-period 180 
source@RouterF# set disable 
 
Then, put the interface at the far end of the link into loopback:
 
[edit interfaces t1-0/0/3 ]
source@RouterE# set t1-options loopback remote 
 
Then run the BERT test on the local router:
 
source@RouterF> test interface t1-0/0/3 t1-bert-start
 
Use the following command to stop a BERT test:
 
source@RouterF> test interface t1-0/0/3 t1-bert-stop
 
On the remote end, the link must be in remote loopback mode. Verify that the remote end of the link is in remote loopback mode:
 
source@RouterE> show interfaces t1-0/0/3
 
The show interfaces extensive command shows the results of the BERT test. Here, the test is in progress:
 
source@RouterF> show interfaces extensive t1-0/0/3 | find bert
DS1 BERT configuration:
  BERT time period: 180 seconds, Elapsed: 96 seconds (in progress)
  Induced Error rate: 10e-0, Algorithm: 3 in 24, Repetitive (26)
  
Bit count : 146557240
 Error bit count: 0
 
You can configure an error rate to force errors in the bit stream:
 
[edit interfaces t1-0/0/3]
source@RouterF# set t1-options bert-error-rate 3
 
This configuration generates one error in every 1,000 packets (10e-3). The show interfaces command output shows the number of errors and the error rate:
 
source@RouterF> show interfaces t1-0/0/3 extensive | find bert
DS1  
BERT configuration:
    BERT time period: 10 seconds, Elapsed: 10 seconds (completed)
    Induced Error rate: 10e-3, Algorithm: 3 in 24, Repetitive (26)
    Bit count : 15369016
    Error bit count: 15355
    Error rate: 10e-3.0
 
 
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