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Maintenance
4-213360-A2-GB20-20 December 1996
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
If you select ALL, LLB, PLB, DLB, or RLB, skip
Step 5.
5. From the Abort screen, press the Function key that
corresponds to the port for which you want to
abort the test. Use the scroll keys, if necessary.
F1
Abort:
Test Name
Prt1 Prt2 Prt3
F2
F3
When abort is complete, the message Command
Complete appears on the Abort screen.
NOTE
Be careful when selecting a
specific loopback test to abort. 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. You can use
the TStat branch of the menu 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:
• 32767 – A pseudo-random bit sequence (PRBS)
that is 32,767 bits long (on the network only). This
is a PRBS 2
15
–1 test.
• 511 – A pseudo-random bit sequence (PRBS) that is
511 bits long (on the data ports only). This is a
PRBS 2
9
–1 test.
• 1-in-8 – A test pattern consisting of a one (1)
followed by seven zeros (on the network only).
• QRSS – A quasi-random signal source
approximating live data that can be monitored for
logic errors (on the data ports only).
Sending Test Patterns
Use the Send command to start transmission of a test
pattern.
Only one test pattern can be active at a time on one
port. Table 4-10 lists the valid send test pattern
combinations. Valid combinations are identified by YES.
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