Lucent Technologies DDM-2000 OC-3 User Manual

363-206-285
Page4of6 Issue3,June2001
DDM-2000 OC-3 MULTIPLEXER
Troubleshooting (Problem Receipt,
Diagnosis & Resolution
a. Obtain the following information regarding the equipment and the trouble:
■ Nature of observed problem, name, and telephone number of on-site
customer contact, circuit pack identifications for the DDM-2000 OC-3/OC-12
Multiplexer
■ Dial-in phone number for the DDM-2000, Login ID and password. Note:
Information on access to the customer’s DDM-2000 system is sensitive and
should be treated accordingly; only qualified persons who have a clear need
to know should request and/or accept such information.
■ Network map or diagram showing all equipment connected to the DDM-2000
inputs and outputs, and preferably the network of interest showing cross-
connection report.
b. Alarms: During a trouble condition, the DDM-2000 displays alarms that help in
troubleshooting. The USER PANEL and circuit pack LEDs indicate the alarms;
alarms can also be remotely monitored on a PC via a modem. The types of alarms
are:
■ Critical Alarm: Loss of service to more than 96 DS0 channels (4 DS1).
■ Major Alarm: Loss of service to 96 or less DS0 channels.
■ Minor Alarms.
c. Given the high reliability of the DDM-2000 Multiplexer, it is likely (~ 80% probability)
that the trouble lies outside of the DDM-2000. It could be located in the upstream or
downstream devices in the network, and in the quality of data being received by the
DDM-2000. This possibility should be kept in mind during the troubleshooting
process.
d. Check for the following symptoms to form a preliminary diagnosis (this can be done
over the phone with the user, if you are off site):
Table 2. Troubleshooting Symptoms
Symptom Cause Action
USER PANEL PWR ON
LED OFF
Loss of Power Restore Power
USER PANEL CR, MJ,or
MN LED ON
Critical, Major, or Minor
Alarm
Log on to network and
continue diagnosis
Circuit pack FAULT LED
ON
Circuit pack failure Reseat circuit pack. If fault
remains, replace circuit
pack
Circuit pack FAULT LED
FLASHING
Signal bad (LOS, LOF,
BER, or LOP); failure of
other equipment; failure of
fiber or cable
Trouble likely to be
external to DDM-2000.
Log on to network and
continue diagnosis

Lucent Technologies DDM-2000 OC-3 Specifications

General

Brand	Lucent Technologies
Model	DDM-2000 OC-3
Category	Multiplexer
Language	English