363-206-285
Page 4 of 6
Issue 3, June 2001
DDM-2000 OC-3 M
ULTIPLEXER
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
Summary of Contents for DDM-2000 OC-3
Page 4: ......
Page 14: ...xiv Issue 3 June 2001 Contents GL Glossary GL 1 ...
Page 24: ...xxiv Issue 3 June 2001 Figures ...
Page 28: ...Tables xxviii Issue 3 June 2001 A A SONET Overview A 34 SONET Transport Rates A 20 ...
Page 58: ...363 206 285 About This Document lviii Issue 3 June 2001 ...
Page 60: ...1 ii Issue 3 June 2001 Table of Contents ...
Page 80: ...363 206 285 System Introduction 1 20 Issue 3 June 2001 ...
Page 154: ...3 ii Issue 3 June 2001 Table of Contents ...
Page 184: ...4 ii Issue 3 June 2001 Table of Contents ...
Page 252: ...363 206 285 Transmission and Synchronization Interfaces 5 60 Issue 3 June 2001 ...
Page 254: ...6 ii Issue 3 June 2001 Table of Contents ...
Page 278: ...7 vi Issue 3 June 2001 Table of Contents ...
Page 436: ...363 206 285 Circuit Pack Descriptions 7 158 Issue 3 June 2001 ...
Page 440: ...8 iv Issue 3 June 2001 Table of Contents ...
Page 518: ...363 206 285 Administration and Provisioning 8 78 Issue 3 June 2001 ...
Page 588: ...10 iv Issue 3 June 2001 Table of Contents ...
Page 690: ...363 206 285 Commands and Reports 11 20 Issue 2 February 2000 ...
Page 1252: ...11 582 2000 February 2 Issue OC 3 DDM 2000 ...
Page 1254: ...A ii Issue 3 June 2001 Table of Contents ...
Page 1276: ...363 206 285 A SONET Overview A 22 Issue 3 June 2001 ...
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Page 1348: ...363 206 285 Acceptance IXL 001 Issue 3 June 2001 Page 2 of 2 DDM 2000 OC 3 MULTIPLEXER ...
Page 1412: ...NTP 003 System Turnup 363 206 285 Page 6 of 6 Issue 2 February 2000 DDM 2000 OC 3 MULTIPLEXER ...
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Page 1440: ...NTP 008 Circuit Order 363 206 285 Page 6 of 6 Issue 2 February 2000 DDM 2000 OC 3 MULTIPLEXER ...
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Page 1652: ...363 206 285 Circuit Order NTP 038 Issue 2 February 2000 Page 6 of 6 DDM 2000 OC 3 MULTIPLEXER ...
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Page 1808: ...363 206 285 Circuit Order NTP 052 Issue 2 February 2000 Page 6 of 6 DDM 2000 OC 3 MULTIPLEXER ...
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