Lucent Technologies MERLIN LEGEND Release 5.0 Maintenance And Troubleshooting Manual page 203

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting 555-650-140
Control Unit Problems
100D Module Problems
Restoring the Module
After completing the CSU Loopback Test, follow the steps below to restore the
module.
If you are finished testing modules, restore the 100D module. Refer

to ''Restore'', earlier in this chapter, for instructions.
Reset the CSU.

Automatic Tests for the 100D Module
Every 15 minutes, the system checks the 100D module for the following:
Initialization. The system ensures that all T1 ports are properly
initialized and placed into service. It also resolves the conflicts of different
service levels (for example, between the individual ports or for the
initialization of the ports to support features).
Error Detection. The system detects errors and takes the trunk out of
service, if appropriate. It attempts to restore the trunk and put it back into
service.
Error Recording. The system records all errors and outages in the error
logs.
Audits and Updates. The system checks the state of the T1 facilities
through audits, status checks, and error logging.
For the 551 T1 CSU, unplug the patch cord, first from the EQ IN
jack and then from the EQ OUT jack.
For the ESF T1 CSU, flip the DTE LOOPBACK switch down (to
deactivate the loopback).
For the ACCULINK 3150 CSU press the right arrow key once to
display the selection, then press the F3 button to select
Ctrl
. Press the right arrow key twice to display the reset
Ctrl
selection. Now press the F1 button to initiate a reset of the CSU.
Issue 1
June 1997
Page 4-113