AT&T MERLIN LEGEND Release 3.1 Maintenance And Troubleshooting Manual page 183

100D Module Problems
LINE LOOPBACK
(ACCULINK 3150
CSU)
Busy-Out or Reset
Interrupting the Test
Test Failure
Restore
In preparation for running the CSU Loopback Test, perform the following
steps at the CSU.
1 Busy-out the 100D module.
2 Prepare the CSU.
For the 551 T1 CSU, connect the EQ OUT and EQ IN jacks (see Figure 4–8).
a Plug one end of a bantam-to-bantam patch cord (or a loopback fixture)
into the EQ OUT jack on the front of the CSU.
b Plug the other end of the patch cord into the EQ IN jack on the CSU.
This causes the 551 T1 CSU to either loop back the network signal or send
the all-ones pattern, depending on the chosen CSU option.
For the ACCULINK 3150 only, select front panel
Line Loopback command. Details are provided
below.
Prior to beginning the test, busy-out the 100D
module. Both
menu, which you can access by doing the following
from the console:
Menu
See "Busy-Out and Reset," earlier in this chapter,
for additional information.
You can interrupt the test by selecting
If the test fails, record the errors on the repair tag
and replace the module.
If the 100D module successfully completes the CSU
Loopback Test, restore the module.
the Slot menu, which you can access by doing the
following from the console:
Menu
See the "Restore" procedure, earlier in this chapter,
for additional information.
and are in the Slot
.
.
is in
.
Control Unit Problems
4–93