CHAPTER
1-1
Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
1
General Troubleshooting
Note The terms "Unidirectional Path Switched Ring" and "UPSR" may appear in Cisco literature. These terms
do not refer to using Cisco ONS 15xxx products in a unidirectional path switched ring configuration.
Rather, these terms, as well as "Path Protected Mesh Network" and "PPMN," refer generally to Cisco's
path protection feature, which may be used in any topological network configuration. Cisco does not
recommend using its path protection feature in any particular topological network configuration.
This chapter provides procedures for troubleshooting the most common problems encountered when
operating a Cisco ONS 15454. To troubleshoot specific ONS 15454 alarms, see Chapter 2, “Alarm
Troubleshooting.” If you cannot find what you are looking for, contact the Cisco Technical Assistance
Center (TAC) at 1 800 553-2447.
For an update on End-of-Life and End-of-Sale notices, refer to
http://cisco.com/en/US/products/hw/optical/ps2006/prod_eol_notices_list.html.
This chapter includes the following sections on network problems:
• 1.1 Troubleshooting Circuit Paths with Loopbacks, page 1-2—Describes loopbacks and hairpin
circuits, which you can use to test circuit paths through the network or logically isolate faults.
Note For dense wavelength division multiplexing (DWDM) network acceptance tests, refer to the
Cisco ONS 15454 DWDM Procedure Guide.
• 1.2 Troubleshooting Electrical Circuit Paths With Loopbacks, page 1-9—Explains how to use
loopback tests described in “1.1 Troubleshooting Circuit Paths with Loopbacks” to isolate trouble
on DS-1, DS-3, or EC-1 electrical circuits.
• 1.3 Troubleshooting DS3XM-6 or DS3XM-12 Card Electrical Paths With FEAC Loopbacks,
page 1-45—Describes how DS3XM-6 and DS3XM-12 card far-end alarm and control (FEAC)
functions.
• 1.4 Troubleshooting Optical Circuit Paths With Loopbacks, page 1-47—Explains how to use
loopback tests described in “1.1 Troubleshooting Circuit Paths with Loopbacks” to isolate trouble
on OC-N optical circuits.
• 1.5 Troubleshooting Ethernet Circuit Paths With Loopbacks, page 1-68—Explains how to use
loopback tests described in “1.1 Troubleshooting Circuit Paths with Loopbacks” to isolate trouble
on G-Series or CE-Series Ethernet circuits.
• 1.6 Troubleshooting FC_MR Circuit Paths With Loopbacks, page 1-94—Explains how to use
loopbacks tests described in “1.1 Troubleshooting Circuit Paths with Loopbacks” to isolate trouble
on Fibre Channel (FC_MR) circuits.
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