Juniper JUNOSE 10.0.X PHYSICAL LAYER Configuration Manual page 54

JUNOSe 10.0.x Physical Layer Configuration Guide
t1 remote-loopback
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Testing Interfaces
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.