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t1 loopback
Syntax
Release Information
Description
Options
Mode
Copyright © 2010, Juniper Networks, Inc.
t1 t1Channel loopback [ local | network { line | payload } ]
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.
Configures a loopback test for a T1 line on a CT3 module. The no version deactivates 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.
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.
Controller Configuration
Chapter 8: T Commands
1267
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