Juniper JUNOSE 10.0.X PHYSICAL LAYER, Руководство по настройке

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Testing Interfaces
Testing interfaces allows you to troubleshoot problems and to check the quality of
links at various layers in the interface stack. The router supports the following test
options:
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Transmission of BERT patterns to remote devices
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Local loopback — Loops the data back toward the router; on supported line
modules, also sends an alarm indication signal (AIS) out toward the network
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Network loopback—Loops the data toward the network before the data reaches
the frame
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Payload loopback—Loops the data toward the network after the framer processes
the data
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Remote loopback—Provides the ability to:
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Request that remote devices enter into loopback
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Be placed in loopback by remote devices
Sending BERT Patterns
The router can send BERT patterns from different layers in the interface stack on
frame-based T3 interfaces.
For a list of the modules that support bit error rate tests, see ERX Module Guide ,
Appendix A , Module Protocol Support .
To send BERT patterns:
1.
Select a controller.
host1(config)# controller t3 3/2
2.
Configure a specific layer in the interface to generate BERT patterns.
host1(config-controll)# bert pattern 2^11 interval 10
For information about BERT patterns, see “References” on page 50.
bert
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Use to enable bit error rate tests using the specified pattern on a T3 interface.
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Unlike other configuration commands, bert is not stored in NVRAM.
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Specify one of the following test patterns:
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0s —Repetitive test pattern of all zeros, 00000...
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1s —Repetitive test pattern of all ones, 11111...
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2^9 —Pseudorandom test pattern, 511 bits in length
Testing Interfaces
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Chapter 2: Configuring T3 and E3 Interfaces