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T1 Interface Configuration Command Set Command Reference Guide

loopback network [ line | payload ]

Use the loopback network command to initiate a loopback on the interface toward the network. Use the

no form of this command to deactivate the loopback.

Syntax Description

line

Initiates a metallic loopback of the physical T1 network interface.

payload

Initiates a loopback of the T1 framer (CSU portion) of the T1 network interface.

Default Values

No default necessary for this command.

Command Modes

(config-t1 1/1)# T1 or DSX-1 Interface Configuration Mode required.

(config-t1 1/2)#

Command History

Release 1.1 Command was introduced

Functional Notes

The following diagram depicts the difference between a line and payload loopback.

Usage Examples

The following example initiates a payload loopback of the T1 interface:

(config)#

interface t1 1/1

(config-t1 1/1)#

loopback network payload

T1 Network Interface

DS1

NI CSU

Payload Loopback

Line Loopback

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