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Command Reference Guide T1 Interface Configuration Command Set

loopback remote line [ fdl | inband ]

Use the loopback remote line command to send a loopback code to the remote unit to initiate a line

loopback. Use the no form of this command to send a loopdown code to the remote unit to deactivate the

loopback.

Syntax Description

fdl

Uses the facility data link (FDL) to initiate a full 1.544 Mbps loopback of the signal

received by the remote unit from the network.

inband

Uses the inband channel to initiate a full 1.544 Mbps physical loopback (metallic

loopback) of the signal received from the network.

Default Values

No defaults necessary for this command.

Command Modes

(config-t1 1/1)# T1 Interface Configuration Mode required (does not apply to DSX-1 interfaces)

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 remote line loopback using the FDL:

(config)#

interface t1 1/1

(config-t1 1/1)#

loopback remote line fdl

T1 Network Interface

DS1

NI CSU

Payload Loopback

Line Loopback

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