Advertisement
1.1 Troubleshooting Non-DWDM Circuit Paths with Loopbacks
•
•
•
•
•
•
1.1 Troubleshooting Non-DWDM Circuit Paths with Loopbacks
Use loopbacks and hairpin circuits to test newly created SDH circuits before running live traffic or to
logically locate the source of a network failure. All ONS 15454 SDH electrical cards, STM-N cards,
G-Series Ethernet cards, MXP, TXP cards, and FC_MR-4 cards allow loopbacks and hairpin test circuits.
Other cards that do not allow loopback include E-Series Ethernet, ML-Series Ethernet, and DWDM
cards such as Optical Booster (OPT-BST), Optical Preamplifier (OPT-PRE), Optical Service Channel
and Combiner/Splitter Module (OSC-CSM), Band Optical Add/Drop Multiplexing (AD-xB-xx.x), and
Channel Optical Add/Drop Multiplexing (AD-xC-xx.x) cards.
To create a loopback on a port, the port must be in the Locked,maintenance Admin State and the
Locked-Enabled, loopback & maintenance service state.
Facility (line) or terminal loopbacks can be service-affecting. To protect traffic, apply a lockout or Force
Caution
switch to the target loopback port. Basic directions for these procedures exist in the
Switching, Lock Initiation, and Clearing" section on page
operations, refer to the Cisco ONS 15454 SDH Procedure Guide Chapter 15, "Maintain the Node."
On STM-N cards, a facility (line) loopback applies to the entire card and not an individual circuit.
Caution
Exercise caution when using loopbacks on an STM-N card carrying live traffic.
1.1.1 Facility Loopbacks
The following sections give general information about facility loopback operations and specific
information about ONS 15454 SDH card loopback activity.
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-2
1.8 Restoring the Database and Default Settings, page
software data and restoring the node to the default setup.
1.9 PC Connectivity Troubleshooting, page
and network connectivity to the ONS 15454 SDH.
1.10 CTC Operation Troubleshooting, page
Transport Controller (CTC) login or operation problems.
1.11 Circuits and Timing, page
and error reporting as well as timing reference errors and alarms.
1.12 Fiber and Cabling, page
connectivity errors.
1.13 Power Supply Problems, page
problems.
1-107—Provides procedures for restoring
1-113—Provides troubleshooting procedures for PC
1-119—Provides troubleshooting procedures for Cisco
1-132—Provides troubleshooting procedures for circuit creation
1-136—Provides troubleshooting procedures for fiber and cabling
1-144—Provides troubleshooting procedures for power supply
2-260. For more information about these
Chapter 1
General Troubleshooting
"2.10.2 Protection
July 2005
Advertisement
