Juniper JUNOSE 10.0.X PHYSICAL LAYER, Configuration Manual

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loopback. Specify the ansi keyword to enable the remote line FDL ANSI bit
loopback on the T1 line, according to the ANSI T1.403 specification.
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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 FDL Bellcore bit loopback on the T1 line, according to the Bellcore
TR-TSY-000312 specification.
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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 line. You can specify
fdl or ansi .
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Example
host1(config-controll)# path 12 ds3 2 t1 14 loopback remote payload
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Use the no version to send the 16-bit ESF data link code word to deactivate the
loopback at the remote end, depending on the last activate request sent to the
remote end.
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See path ds3 t1 loopback.
path ds3 t1 remote-loopback
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Use to enable the router to accept remote loopback requests from a remote
device connected at the T1 over T3 layer.
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Example
host1(config-controll)# path 12 ds3 2 t1 14 remote-loopback
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Use the no version to restore the default, which is to reject remote loopback
requests.
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See path ds3 t1 remote-loopback.
Testing Connectivity
Use the path overhead j1 command to check for connectivity between the router
and a SONET/SDH device at the other end of the line. This command defines:
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A message that the router sends from the specified interface to the SONET/SDH
device at the other end of the line.
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A message that the router expects to receive on the specified interface from the
SONET/SDH device at the other end of the line.
When you define a message that the interface sends, you must monitor receipt of
that message at the remote end.
When you define a message that the interface expects to receive, you should configure
the remote device to transmit the same message to the interface. You can then use
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Testing Interfaces
JUNOSe 10.0.x Physical Layer Configuration Guide