Lucent Technologies MERLIN LEGEND Release 5.0 Maintenance And Troubleshooting Manual page 195

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting 555-650-140
Control Unit Problems
100D Module Problems
Busy-out the 100D module.

Prepare the CSU.

For the 551 T1 CSU, connect the EQ OUT and EQ IN jacks (see
4-8).
a. Plug one end of a bantam-to-bantam patch cord (or a loopback
b. Plug the other end of the patch cord into the EQ IN jack on the
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 loopback test (see
For the ACCULINK 3150 CSU, Press the F2 button on the front panel to select
"Test" from the menu screen. From the Test screen, press the F2 button to
select "Lpbk." From the Loopback screen, press the right arrow once to display
additional loopback tests. Press the F3 button to display "DLB" (DTE
Loopback). When DLB is selected, "Test Started" appears on line 2 of the menu
screen. (See Figures
The ACCULINK 3160/3164 DSU/CSU is physically similar to the 3150 CSU with
programming on the front panel and menus appearing on the LCD screen. For
the preparation of specific tests, see the operator's guide that comes with the
unit.
fixture) into the EQ OUT jack on the front of the CSU.
CSU.
4-10 through 4-13.)
Figure 4-9).
Issue 1
June 1997
Page 4-105
Figure