100D Module Problems

Interrupting the Test

You can interrupt the test by selecting Exit.

Test Failure

If the test fails, record the errors on the repair tag

 

and replace the module.

Restore

If the 100D module successfully completes the CSU

 

Loopback Test, restore the module. Restore is in

 

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.

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).

aPlug 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 4-10through 4-13.)

4-72Control Unit Problems

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AT&T 3.0 manual Busy-out the 100D module Prepare the CSU