CHAPTER
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Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
1
General Troubleshooting
This chapter provides procedures for troubleshooting the most common problems encount ered when
operating a Cisco ONS 15327. To troubleshoot specific ONS 15327 alarms, see Chapter 2, “Alarm
Troubleshooting.” If you cannot find what you are looking for contact the Ci sco Technical Assistance
Center (Cisco TAC).
This chapter includes the following sections on network problems:
•1.1 Network Troubleshooting Tests—Describes loopbacks and hairpin circuits, which you can use
to test circuit paths through the network or logically isolate faults.
Note For network acceptance tests, refer to the CiscoONS 15327 Procedure Guide.
•1.2 Identify Points of Failure on a DS-N Circuit Path—Describes the steps to perform loopback and
hairpin tests, which you can use to test DS-N circuit paths through th e net work o r log ica lly isol ate
faults.
•1.3 Identify Points of Failure on an OC-N Circuit Path—Describes the steps to perform lo opbac k
and hairpin tests, which you can use to test OC-N circuit paths through the network or logically
isolate faults.
The remaining sections describe symptoms, problems, and solutions that are categorized according to
the following topics:
•1.4 Restoring the Database and Default Settings—Provides procedures for restoring software data
and restoring the node to the default setup.
•1.5 PC Connectivity Troubleshooting—Provides troubleshooting procedures for PC and network
connectivity to the ONS 15327.
•1.6 CTC Operation Troubleshooting—Provides troubleshooting procedures for CTC login or
operation problems.
•1.7 Circuits and Timing—Provides troubleshooting procedures for circuit creation and error
reporting as well as timing reference errors and alarms.
•1.8 Fiber and Cabling—Provides troubleshooting procedures for fiber and cabling conne ctivity
errors.