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t1 remote-loopback
Monitoring Interfaces
Copyright © 2010, Juniper Networks, Inc.
controllers. Specify the payload keyword to loop the payload data back toward the
network at the T1 framer and automatically set a local loopback at the HDLC
controllers.
remote line fdl ansi—Sends a repeating 16-bit ESF data link code word (00001110
11111111) to the remote end requesting that it enter into a network line loopback. Specify
the ansi keyword to enable the remote line facilities data link (FDL) ANSI bit loopback
on the T1 channel, according to the ANSI T1.403 Specification.
remote line fdl bellcore—Sends a repeating 16-bit ESF data link code word
(00010010 11111111) to the remote end requesting that it enter into a network line
loopback. Specify the bellcore keyword to enable the remote line facilities data link
(FDL) Bellcore bit loopback on the T1 channel, per the Bellcore TR-TSY-000312
Specification.
remote line inband—Sends a repeating 5-bit inband pattern (00001) to the remote
end requesting that it enter into a network line loopback
remote payload [ fdl ] [ ansi ]—Sends a repeating, 16-bit, ESF data link code word
(00010100 11111111) to the remote end requesting that it enter into a network payload
loopback. Enables the remote payload facilities data link (FDL) ANSI bit loopback
on the T1 channel. You can optionally specify fdl and ansi.
If you do not specify an option, the router will set a local loopback for the channel.
Example
host1(config-controll)#t1 2 loopback local
Use the no version to deactivate loopback. If you specify the remote keyword, the no
version sends the 16-bit ESF data link code word or inband pattern to deactivate the
loopback at the remote end based on the last activate request sent to the remote end.
If you do not specify the remote keyword, the no version clears the local loopback
configuration.
See t1 loopback.
Use to enable the acceptance of loopback commands issued from a remote router.
Example
host1(config-controll)#t1 2 remote-loopback
Use the no version to restore the factory default, which is to reject loopback commands
issued from a remote router.
See t1 remote-loopback.
From User Exec mode, use the following show commands to monitor and display the
T3 interface, T1 interface, and HDLC serial data channel information:
Chapter 1: Configuring Channelized T3 Interfaces
27
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