Monitoring and Testing
4-153163-A2-GB20-10 March 1999
3. From the Loopback screen, select Abort.
F1
Loopback:
Abort LLB PLB
F2 F3
4. From the Loopback Abort screen, press the
desired Function key to abort All or one specific
loopback test. Use the scroll keys, if necessary.
F1
Loopback: Abort
All LLB PLB
F2 F3
When abort is complete, the message Command
Complete appears on the Abort screen.
NOTE
If you mistakenly choose to abort
a loopback test that is not
currently running, a Command
Complete message will still
display and the loopback that is
currently active will still be
running. Use the TStat branch to
view the test status to determine if
the abort was successful.
Test Patterns
Use the Test Pattern commands to send, monitor, and
abort test patterns. Available test patterns are:
•QRSS – A quasi-random signal source
approximating live data that can be monitored for
logic errors (on the network and the data port).
•1-in-8 – A test pattern consisting of a one (1)
followed by seven zeros (on the network only).
•511 – A pseudo-random bit sequence (PRBS) that is
511 bits long (on the data ports only). This is a
PRBS 29–1 test.

Sending Test Patterns

Use the Send command to start transmission of a test
pattern.
Only one test pattern can be active at a time.
"Procedure
To send a test pattern:
1. From the top-level menu screen, select Test.
2. From the Test screen, select Ptrns.
F1
Test:
Rlpbk Lpbk Ptrns
F2 F3
3. From the Patterns screen, select Send.
F1
Patterns:
Abort Send Mon
F2 F3
4. From the Patterns Send screen, press F1 to send a
QRSS pattern, F2 to send a 1-in-8 pattern, F3 to
send a 511 pattern.
F1
Patterns: Send
QRSS 1in8 511
F2 F3
If you send a 1-in-8 pattern, skip Step 5.