Juniper JUNOSE 10.0.X PHYSICAL LAYER, Configuration Manual

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2^11 —Pseudorandom test pattern, 2047 bits in length
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2^15 —Pseudorandom test pattern, 32,767 bits in length
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2^20 —Pseudorandom test pattern, 1,048,575 bits in length
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2^20-QRSS —Pseudorandom QRSS test pattern, 1,048,575 bits in length
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2^23 —Pseudorandom test pattern, 8,388,607 bits in length
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alt-0-1 —Repetitive alternating test pattern of zeros and ones, 01010101...
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Specify the duration of the test in the range 1–1440 minutes.
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Example
host1(config-controll)# bert pattern 2^11 interval 10
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Use the no version to stop the test that is running.
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See bert.
Enabling Local, Network, and Payload Loopback
To enable local, network, or payload loopback testing of a T3 or E3 line, use the
clock source and loopback commands from Controller Configuration mode.
1.
Change the clock source to internal.
host1(config-controll)# clock source internal module
2.
Specify a loopback.
host1(config-controll)# loopback local
Enabling Remote Loopback
You can enable remote loopback capability on frame-based T3 interfaces configured
to use C-bit framing. Remote loopback is
not supported on E3 ATM, E3 FRAME, and
T3 ATM interfaces.
For a list of the modules that support remote loopback, see ERX Module Guide ,
Appendix A , Module Protocol Support .
To enable remote loopback:
1.
Change the clock source to internal.
host1(config-controll)# clock source internal module
2.
Ensure that the line is configured to use C-bit framing, which is the default for
frame-based T3 interfaces.
host1(config-controll)# framing c-bit
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Testing Interfaces
JUNOSe 10.0.x Physical Layer Configuration Guide