• DCH at Switch B is in remote loopback mode (RLB)
• remote capability (RCAP) is MSDL
Performing remote loopback tests
1. Place DCH links on both systems in TEST mode. Enter ENL TEST x on Switch A
and ENL TEST y on Switch B for the same DCH link. The DCH links on both
switches are automatically placed in idle state (IDLE).
2. Place the Switch B DCH link in remote loopback state (RLB) with ENL RLB DCH x.
The DCH link in Switch A must stay in idle.
3. From Switch A, perform the loopback test with TEST RLB DCH x.
The result of the remote loopback test is displayed on Switch A's console in the
following format:
DCH : X RLB TEST CONFIRM TIME : <time of day> TEST : PASS TEST : FAIL -
NO DATA RCV FAR END TEST : FAIL - CORPT DATA RCV FAR END TEST : FAIL
- REASON UNKNOWN
TEST : FAIL may indicate a problem in the physical link between the two switches,
or faulty equipment in either switch. Check the connections, and verify the status of
the MSDL and PRI trunk cards used for this link.
4. Place the Switch B DCH link back to the idle state, with the DIS RLB y
command.
5. If you think the MSDL card used in either switch has failed, check the status of the
DCH link and the status of the MSDL card by entering STAT MSDL x FULL.
6. If the MSDL card is faulty, disable the card and perform a self-test:
DIS MSDL x SLFT MSDL x
7. If the card passed the test, the problem may lie in incompatible software. Refer to
Avaya Circuit Card Reference (NN43001-311).
8. After the test is complete, remove both sides from the test state:
DIS TEST x DIS TEST y
See
Figure 13: Remote loopback tests (NT6D80) on page 72.
MSDL remote loopback tests (NT6D80)
ISDN Primary Rate Interface Maintenance November 2011 71
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