Loopback Description - Cisco NCS 2000 series Troubleshooting Manual

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
page 99
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:
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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.
If you cannot find what you are looking for, contact Cisco Technical Support (1 800 553-2447).
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
C H A P T E R
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
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Alarm Troubleshooting, on
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