CHAPTER 1
General Troubleshooting
This chapter provides procedures for troubleshooting the most common problems encountered when operating
a DWDM shelf in ANSI or ETSI platforms. To troubleshoot specific alarms, see Alarm Troubleshooting, on
page 99 If you cannot find what you are looking for, contact Cisco Technical Support (1 800 553-2447).
Alarms can occur even in those cards that are not explicitly mentioned in the Alarm sections. When an alarm
is raised, refer to its clearing procedure.
This chapter includes the following sections on network problems:
• Loopback Description, on page 1
• Troubleshooting MXP, TXP, XP, or ADM-10G Circuit Paths With Loopbacks, on page 7
• Troubleshooting DWDM Circuit Paths With ITU-T G.709 Monitoring, on page 27
• Using CTC Diagnostics, on page 33
• Onboard Failure Logging, on page 37
• Restoring the Database and Default Settings, on page 40
• PC Connectivity Troubleshooting, on page 40
• CTC Operation Troubleshooting, on page 47
• Timing, on page 57
• Fiber and Cabling, on page 59
• Power Supply Problems, on page 63
• Power Up Problems for Node and Cards, on page 65
• Network Level (Internode) Problems, on page 65
• Node Level (Intranode) Problems, on page 80
Loopback Description
To create a loopback on an ANSI or SONET port, the port must be in the Out-of-Service and Management,
Maintenance (OOS-MA,MT) service state. After you create the loopback, the service state becomes
Out-of-Service and Management, Loopback and Maintenance (OOS-MA,LPBK & MT).
To create a loopback on an a port, the port must be in the Locked, maintenance administrative state and the
Locked-Enabled, loopback & maintenance administrative state.
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
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