Msdl Remote Loopback Tests (Nt6D80) - Nortel Communication Server 1000S Maintenance Manual

Page 90 of 210 D-channel maintenance

MSDL remote loopback tests (NT6D80)

553-3001-517 Standard 2.00
Before beginning this test, verify the following:
• D-channels on both switches are configured on MSDL cards
• DCH links on both switches are set to TEST mode
• DCH at Switch B is in remote loopback mode (RLB)
• remote capability (RCAP) is MSDL
Procedure 13
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
may indicate a problem in the physical link between the two
TEST : FAIL
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
September 2004