Instruction manual

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting
555-650-140
Issue 1
June 1997
Control Unit Problems
Page 4-104
100D Module Problems
Summary
In preparation for running the CSU Loopback Test, perform the following steps
at the CSU.
Console Procedure Menu→
Maintenance→Slot→Dial the slot
no.→
Enter→CSU-lpbk
PC Procedure → →Type the slot no.→ →
Appropriate Modules This test can be run only on 100D modules.
Time Estimate Approximately 2 minutes
EQ IN and EQ OUT
(551 T1 CSU)
For the 551 T1 CSU only, connect a patch cord
from the CSU EQ IN jack to the CSU EQ OUT jack.
Details are provided below.
DTE LOOPBACK
(ESF T1 CSU)
For the ESF T1 CSU only, flip the DTE LOOPBACK
switch on the front panel to the up position to
activate the loopback. Details are provided below.
LINE LOOPBACK
(ACCULINK 3150 CSU)
For the ACCULINK 3150 only, select front panel Line
Loopback command. Details are provided below.
Busy-Out or Reset Prior to beginning the test, busy-out the 100D module.
Both
Busy-out and Reset are in the Slot menu, which
you can access by doing the following from the console:
Menu→
Maintenance→Slot.
See ‘‘
Busy-Out and Reset’’, earlier in this chapter, for
additional information.
Interrupting the Test You can interrupt the test by selecting
Exit.
Test Failure If the test fails, record the errors on the repair tag and
replace the module.
Restore If the 100D module successfully completes the CSU
Loopback Test, restore the module.
Restore is in the
Slot menu, which you can access by doing the following
from the console:
Menu→
Maintenance→Slot.
See the ‘‘
Restore’’ procedure, earlier in this chapter, for
additional information.