
Command Reference Guide T1 Interface Configuration Command Set
61950860L1-35D © 2003 ADTRAN, Inc. 341
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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