Figure 4-4. Module Test Process - AT&T MERLIN LEGEND Communications System Release 2.0 Maintenance And Troubleshooting Manual

Control Unit Problems
1 Check the equipment:
power supply
processor
(back up the system programming)
2 Check the error logs
3 Resolve any processor problems
4 Busy-out or reset the module
5 Run the Internal Loopback test
6 Run the Board Controller test
7 Run the BchLoopback test
for MLX modules only
8 Run the CSU Loopback test
for 1000 modules only
9 Replace the module
10 Restore the module

Figure 4-4. Module Test Process

maintenance terminal
(use the PC when testing
MLX modules)
errors
errors
Record the errors on
the repair t ag and
errors continue w ith the
next step.
errors
Module Problems
4-23