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T1/E1 Digital Voice Port Adapter Installation and Configuration
OL-3592-02
Chapter 4 Configuring the PA-VXA, PA-VXB, and PA-VXC
Checking the Configuration
Cisco 7401ASR Routers:
Router# config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# controller t1 1/0
Router(config-controller)# loopback diagnostic
Cisco 7500 Series Routers:
Router# config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# controller t1 2/2/0
Router(config-controller)# loopback diagnostic
In the preceding examples, the loopback diagnostic command loops the outgoing transmit signal
back to the receive signal and sends an alarm indication signal (AIS) to the network.
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The syntax of the loopback local command is as follows:
loopback [local {payload | line}]
Set the first T1 into local loopback.
Cisco 7200 Series Routers:
Router# config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# controller t1 2/0
Router(config-controller)# loopback local payload
Cisco 7401ASR Routers:
Router# config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# controller t1 1/0
Router(config-controller)# loopback local payload
Cisco 7500 Series Routers:
Router# config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# controller t1 2/2/0
Router(config-controller)# loopback local payload
In the preceding examples, the loopback local payload command loops the incoming signal back
to the line.
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The syntax of the loopback remote command follows:
loopback [remote {esf line | iboc | esf payload}]
Set the first T1 into remote line inband loopback.
Cisco 7200 Series Routers:
Router# config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# controller t1 2/0
Router(config-controller)# loop remote esf line
Cisco 7401ASR Routers:
Router# config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# controller t1 1/0
Router(config-controller)# loop remote esf line
