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Configuring the PA-T3 Interfaces 8-25
Using the loopback Command to Verify the Physical Interface
• Set the interface into local loopback mode as follows:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
router(config)# interface serial 6/0
router(config-if)# loopback local
Local loopback loops the router output data back toward the router at the framer.
• Set the interface into network line loopback mode as follows:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
router(config)# interface serial 6/0
router(config-if)# loopback network line
Network line loopback loops the data back toward the network (before the framer).
• Set the interface into network payload loopback mode as follows:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
router(config)# interface serial 6/0
router(config-if)# loopback network payload
Network payload loopback loops just the payload data back toward the network at the PA-T3
framer.
• Set the interface into remote loopback mode as follows:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
router(config)# interface serial 6/0
router(config-if)# loopback remote
Remote loopback loops the data back toward the network (before the framer at the remote
T3 device).
Note Remote loopback mode works with C-bit framing only. The other loopback modes listed
above work with C-bit, M13, and bypass framing. See the “Specifying T3 Framing” section on
page 8-13 for information on configuring C-bit framing.