Testing Interfaces; Sending Bert Patterns - Juniper PHYSICAL LAYER - CONFIGURATION GUIDE V11.1.X Configuration Manual

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:

Sending BERT Patterns

The router can send BERT patterns from different layers in the interface stack. For
a list of the modules that support bit error rate tests (BERTs), see ERX Module Guide,
Appendix A, Module Protocol Support.
To send BERT patterns:
1.
2.
path ds1|e1 bert
host1(config-if)#encapsulation ppp
Transmission of BERT patterns to remote devices
Receipt of BERT patterns from remote devices
Local loopback—The ability to loop the data back toward the router; on supported
line modules, also sends an alarm indication signal (AIS) out toward the network
Network loopback The ability to loop the data toward the network before the
data reaches the frame
Remote loopback, which provides:
The ability to request that remote devices enter into loopback
The ability to be placed in loopback by remote devices
Connectivity tests to remote devices
Select a controller.
Configure a specific layer in the interface to generate BERT patterns.
For information about BERT patterns, see "References" on page 117.
Use to enable bit error rate tests using the specified pattern at the T1/E1 over
SONET/SDH VT layer.
Unlike other configuration commands, "path ds1|e1 bert" on page 145 is not
stored in NVRAM.
Specify one of the following options:
2^11 Pseudorandom test pattern, 2047 bits in length
2^15 Pseudorandom test pattern, 32,767 bits in length
2^20-O153 Pseudorandom test pattern, 1,048,575 bits in length
Specify the duration of the test in the range 1–1440 minutes.
Optionally, specify the unframed keyword to overwrite the framing bits.
Chapter 4: Configuring Channelized OCx/STMx Interfaces
Testing Interfaces
145