Juniper JUNOSE 11.1.X - COMMAND REFERENCE N TO Z 4-6-2010 Command Reference Manual page 1303

t1 loopback
t1 t1Channel loopback [ local | network { line | payload } ]
Syntax
no t1 t1Channel loopback
t1 t1Channel loopback remote { line { fdl { ansi | bellcore } | inband } |
payload [ fdl ] [ ansi ] }
no t1 t1Channel loopback remote
Command introduced before JUNOSe Release 7.1.0.
Release Information
Configures a loopback test for a T1 line on a CT3 module. The no version deactivates
Description
the loopback test; 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.
Options
t1Channel One or more individual T1 channels, ranges of T1 channels, or
combination of individual channels and ranges, in the range 1–28 (no spaces);
for example, 3,7-15,19-13,27
local Loops the router output data back toward the router at the T1 framer; on
supported line modules also sends an alarm indication signal (AIS) out toward
the network. This is the default setting if you specify no optional keywords.
network line Loops the data back toward the network before the T1 framer
and automatically sets a local loopback at the HDLC controllers
network payload Loops the payload data back toward the network at the T1
framer and automatically sets 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.
The ansi keyword enables the remote line 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. The bellcore keyword enables the remote line FDL Bellcore bit
loopback on the T1 channel, according to 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 FDL ANSI bit loopback on the T1
channel. You can optionally specify fdl and ansi, but it is not necessary.
Chapter 8: T Commands
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t1 loopback