AT&T MERLIN LEGEND Communications System Release 2.0 Maintenance And Troubleshooting Manual page 126

Control Unit Problems
Procedure: Run Internal Loopback Test
Step
1
Maintenance
Make a selection
System
Slot
Port
Exit
2
Slot :
Enter Slot number (OO-17)
xx
Backspace
Exit
3
Slot xx:
Make a selection
Status
Busy-Out
4
Demand Test Slot xx:
Make a selection
Note: Busy out slot first
BoardCntrlr
IntLoopback
Exit
4-36
Module Problems
Display
Enter
Demand Test
Reset
Instructions
Select Slot.
Type the slot number and select Enter.
Select Demand Test.
For all MLX modules, BchLoopback is also
displayed as an option on this screen.
For 100D modules, CSU-lpbk, Error
Events, and Clock are also displayed as
options on this screen.
Select IntLoopback.