Lucent Technologies DDM-2000 OC-3, Руководство по установке

Страница: 430 / 492

11-4 Issue 9 October 1998
363-206-204
Troubleshooting
Procedure
1. Verify that the system is configured for normal operation (that is, fibers are
connected; no external test equipment is connected).
2. Update the SYSCTL equipment list by pressing the UPD/INIT pushbutton
on the SYSCTL.
3. At least one timing generator (TGS) circuit pack MUST be installed.
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.
5. If the TGSs are not working as described, verify that the timing mode selec-
tion is set properly. In a remote terminal (RT), the TGS should be set for
loop timed. One shelf in a system normally in a central office (CO), the TGS
must be set for either, external timing if the DDM-2000 OC-3 is being sup-
plied an external DS1 clock or it should be set for free-running if a clock is
not available.
6. If the TGS is set properly for external timing and a problem still exists, dis-
connect the external timing and set the TGS for free-running.
7. If a problem still exists with the TGS, try the failed unit in the other TGS slot.
If the TGS fails in both slots, replace the TGS circuit pack. If the TGS fails in
only one slot, replace the shelf.
8. In each function group, if one function unit (DS3, STS-1E or MXRVO) is
installed, its ACTIVE LED should be lighted. If two function units are
installed, one should have its ACTIVE LED lighted and the other should
have no LED lighted.
9. If a solid FAULT LED is lighted on any circuit pack, determine if the problem
exists with the shelf or the pack.
10. If the FAULT LED is flashing on the SYSCTL, the shelf is having difficulty
communicating over the data communication channel to the far end. Deter-
mine if the problem is with the transmission path [that is, optical line inter-
face units (OLIUs) with flashing FAULT LEDs] or with the SYSCTL at the far
end.
Additional Procedure With a Terminal
1. Diagnostic information is provided by the DDM-2000 OC-3 using the
rtrv
(RETRIEVE) commands.
2. Use the
rtrv-alm
(RETRIEVE ALARM) command to display the alarms
that the DDM-2000 OC-3 is reporting.
3. Use the
rtrv-eqpt
(RETRIEVE EQUIPMENT) command to display the
equipment installed in the DDM-2000 OC-3.