How to do Loopback Tests for T1/56K Lines :- Introduction When a serial line does not come up as it must, the best way to troubleshoot the circuit is to perform loopback tests. Loopback tests allow you to isolate pieces of the circuit, and test them separately. Begin loopback tests on the customer premises with channel service unit/data service unit (CSU/DSU) loopback tests. Then proceed on to loopback tests that involve the telco or provider. Prerequisites Requirements There are no specific requirements for this document. Components Used The information in this document is based on Cisco IOS® Software Release 12.0. Conventions Refer to Cisco Technical Tips Conventions for more information on document conventions. Background Information Two kinds of loopback tests can be used to isolate problems on the serial link: software loopbacks and hardware plug loopbacks. Whether it is an internal or external CSU/DSU, you can do both software and hardware ...
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