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JUNOSe 11.1.x Physical Layer Configuration Guide
4.
bert
24
Testing Interfaces
Set the loopback to remote to request that a remote device connected on a
T3 interface enter into a loopback.
host1(config-controll)#loopback remote
Configure the T3 interface to enable or disable the ability to enter into a
loopback initiated by a remote device, as follows:
Issue the equipment customer loopback command to enable the router
to enter into loopback when it receives an appropriate signal from the
remote device.
host1(config-controll)#equipment customer loopback
Issue the equipment network loopback command to disable the ability
to enter into loopback initiated by a remote device.
host1(config-controll)#equipment network loopback
Configure the line to run bit error rate tests.
host1(config-controll)#bert pattern 2^15 time 20
Use to enable bit error rate tests using the specified pattern on a channelized T3
interface.
Unlike other configuration commands, bert is not stored in NVRAM.
Specify one of the following test patterns:
0s Repetitive test pattern of all zeros, 00000...
1s Repetitive test pattern of all ones, 11111...
2^9 Pseudorandom test pattern, 511 bits in length
2^11 Pseudorandom test pattern, 2047 bits in length
2^15 Pseudorandom test pattern, 32,767 bits in length
2^20 Pseudorandom test pattern, 1,048,575 bits in length
2^20-QRSS Pseudorandom QRSS test pattern, 1,048,575 bits in length
2^23 Pseudorandom test pattern, 8,388,607 bits in length
alt-0-1 Repetitive alternating test pattern of zeros and ones, 01010101...
Specify the duration of the test in the range 1–1440 minutes.
Example
host1(config-controll)#bert pattern 2^15 interval 20
Use the no version to stop the test that is running.
See bert.
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