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Configuring a Channelized T3 Link
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Configuring the Loopback Mode for the T3 Controller
With loopbacks, you can detect and isolate equipment malfunctions by testing the connection between
the PA-T3+ interface and the remote T3 device such as a DS3 MUX. Remote loopback sends a command
to loop the T3 line at the far end (central office). It can be used to diagnose problems with cables from
the port adapter to the switching office. Network loopback loops the PA-MC-2T3+ T3 port back to the
network allowing the remote end to test the connection to the PA-MC-2T3+. Local loopback loops the
PA-MC-2T3+ T3 port output back to itself allowing it to be tested in isolation from the T3 cables and
remote T3 equipment.
The loopback subcommand places an interface in loopback mode, which enables test packets that are
generated from the ping command to loop through a remote device and cables. If the packets complete
the loop, the connection is good. If not, you can isolate a fault to the remote device or cables in the path
of the loopback test.
You can configure the T3 controller for loopback modes using the controller command:
loopback [local | network | remote]
The default is no loopback.
To return the T3 controller to its default unlooped condition, use the no form of the command.
Table 5-1
PA-MC-2T3+ Multi-Channel T3 Port Adapter Installation and Configuration
5-8
Router(config-controller)# mdl transmit idle-signal
Enable the MDL test signal message transmission as follows:
Router(config-controller)# mdl transmit test-signal
Enter the equipment identification code as follows:
Router(config-controller)# mdl string eic router A
Enter the location identification code as follows:
Router(config-controller)# mdl string lic tst network
Enter the frame identification code as follows:
Router(config-controller)# mdl string fic building b
Enter the unit identification code as follows:
Router(config-controller)# mdl string unit abc
Enter the facility identification code to send in the MDL path message as follows:
Router(config-controller)# mdl string pfi string
Enter the port number to send in the MDL idle signal message as follows:
Router(config-controller)# mdl string port string
Enter the generator number to send in the MDL test signal message as follows:
Router(config-controller)# mdl string generator string
provides examples of the loopback {local | network | remote} command.
Chapter 5
Configuring Channelized mode for the Cisco PA-MC-2T3+
OL-3526-05
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