User`s guide

Performing Loopback Modes and Pattern Tests
6-12
7800-A2-GB26-80
May 1999
The following figure demonstrates a pattern test combined with a loopback mode
that tests both ends of a circuit.
DSU/CSU
Sending/Monitoring
a QRSS Test Pattern
DSU/CSU
in Loopback
(LLB or PLB)
DEVICE A
DEVICE B
T1
NETWORK
496-15097
NOTE:
You can send a 1-in-8 pattern out of the Network T1 interface, but you cannot
monitor it. The 1-in-8 pattern is a low-density bit test so that errors of the sort
that would be detected by a 1-in-8 pattern will likely appear in the line status
fields of the Network T1 Status dialog.
Running Tests
The following sections discuss how to:
H Set Community Names
H Implement the start of a test
H Verify that a test is running
H Check the test results