AT&T MERLIN LEGEND Release 3.0 Installation Manual page 450

100D Module Problems
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 Ioopback 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 ESF T1 CSU, flip the DTE LOOPBACK switch on the front panel to the
up position to activate the Ioopback test (see Figure 4–9).
For the ACCULINK3150 CSU, Press F2 on the front panel to select "Test"
from the menu screen. From the Test screen, press F2 to select "Lpbk". From
the Loopback screen, press the right arrow once to display additional
Ioopback tests. Press F3 to display "DLB" (DTE Loopback). When DLB is
selected, "Test Started" appears on line 2 of the menu screen. (See Figures
4-10 through 4-13.)
4-72 Control Unit Problems
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 → Maintenance → Slot.
See the "Restore" procedure, earlier in this chapter,
for additional information.
Exit.
is in
Restore