Table of Contents
Advertisement
path ds3 t1 bert
Receiving BERT Patterns
Enabling Local or Network Loopback
Copyright © 2010, Juniper Networks, Inc.
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)#path 12 ds3 2 bert pattern Os interval 10
Use the no version to stop the test that is running.
See path ds3 bert.
Use to enable bit error rate tests using the specified pattern at the T1 over T3 layer.
Unlike other configuration commands, "path ds3 t1 bert" on page 141 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.
Example
host1(config-controll)#path 12 ds3 2 t1 14 bert pattern 2^11 interval 10 unframed
Use the no version to stop the test that is running.
See path ds3 t1 bert.
The router can receive BERT patterns from a remote device at the T1/E1 over SONET/SDH
VT and T1/E1 over T3 layers. To receive BERT patterns, configure the interface on the
router for network payload loopback and the remote interface to use the line clock.
Inaccurate results might occur if you use other loopback modes or clock sources.
When the router is synchronized with and receiving BERT patterns from a remote device,
the router records the number of bit errors and the number of bits received. To view these
statistics, issue the show controllers sonet command.
You can enable loopback tests on the router at the following layers in the interface stack:
Chapter 4: Configuring Channelized OCx/STMx Interfaces
141
Advertisement
Table of Contents
