Issue 5 November 2000
363-206-208
Troubleshooting
Lucent Technologies - Proprietary
See Notice on first page
NOTE:
Whenever circuit packs are removed from the shelf, update the SYSCTL equip-
ment list by pressing the UPD/INIT push-button on the SYSCTL, even if you are
just reseating a circuit pack.
NOTE:
If the DDM-2000 appears to be reporting inconsistent alarms, initialize the
SYSCTL as follows:
a. Unseat the SYSCTL.
b. Reseat the SYSCTL.
c. When the CR LED on the user panel starts to flash, press the UPD/INIT push-
button on the front of the SYSCTL within 10 seconds.
NOTE:
A flashing FAULT LED indicates a loss of input signal, not a circuit pack failure.
NOTE:
A solid FAULT LED indicates a failure of the circuit pack, shelf, or possibly
another circuit pack interfacing with the “failed circuit pack.”
NOTE:
The OLIU is the only circuit packs which can have both circuit packs active at the
same time.
NOTE:
For more intensive troubleshooting (down to the signal level), backplane connec-
tor pin assignments are provided in Tables 8-1 through 8-10 on pages 8-6
through 8-30.
OC-12 Multiplexer Troubleshooting
(1) Verify that the system is configured for normal operation (that is, fibers are con-
nected; no external test equipment is connected).
(2) Update the SYSCTL equipment list by pressing the UPD/INIT push-button on
the SYSCTL.
(3) Install at least one timing generator (TGS) circuit pack.
(4) If one TGS is installed, its ACTIVE LED should be lighted. If two TGSs are
installed, then one should have its ACTIVE LED lighted and the other should
have no LED lighted.
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