CHAPTER
1-1
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
1
General Troubleshooting
This chapter provides procedures for troubleshooting the most common problems encountered when
operating a Cisco ONS 15454 SDH. To troubleshoot specific ONS 15454 SDH alarms, see Chapter 2,
“Alarm Troubleshooting.” If you cannot find what you are looking for, contact Cisco Technical Support.
See the “Obtaining Technical Assistance” section on page xlvi for more information.
This chapter includes the following sections on network problems:
• 1.1 Troubleshooting Non-DWDM 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 Installation and Operations Guide, as this guide also applies to DWDM
operations for SDH. For SDH network acceptance tests, refer to the Cisco ONS 15454 SDH Procedure
Guide Chapter 5, “Turn Up Network.”
• 1.2 Troubleshooting Electrical Circuit Paths With Loopbacks, page 1-9—Explains how to use
loopback tests described in “1.1 Troubleshooting Non-DWDM Circuit Paths with Loopbacks” to
isolate trouble on electrical circuits.
• 1.3 Troubleshooting Optical Circuit Paths With Loopbacks, page 1-39—Explains how to use
loopback tests described in “1.1 Troubleshooting Non-DWDM Circuit Paths with Loopbacks” to
isolate trouble on STM-N optical circuits.
• 1.4 Troubleshooting Ethernet Circuit Paths With Loopbacks, page 1-62—Explains how to use
loopback tests described in the “1.1 Troubleshooting Non-DWDM Circuit Paths with Loopbacks”
to isolate trouble on G-Series or CE-Series Ethernet circuits.
• 1.5 Troubleshooting MXP, TXP, or FC_MR Circuit Paths With Loopbacks, page 1-80—Explains
how to use loopbacks tests described in“1.1 Troubleshooting Non-DWDM Circuit Paths with
Loopbacks” to isolate trouble on muxponder (MXP), transponder (TXP), or Fibre Channel
(FC_MR) circuits.
• 1.6 Troubleshooting DWDM Circuit Paths With ITU-T G.709 Monitoring, page 1-96—Explains
how to utilize performance monitoring (PM) and threshold crossing alerts (TCA) to locate signal
degrades on DWDM circuit paths.
The remaining sections describe symptoms, problems, and solutions that are categorized according to
the following topics:
• 1.7 Using CTC Diagnostics, page 1-104—Provides procedures and guidelines for checking card
LED readiness and downloading a diagnostic file for Cisco Technical Support (TAC).
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