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Example # Create a 128 kbps serial interface through timeslot bundling on the first T1 line
on interface T3 2/0.
<Sysname> system-view
[Sysname] interface t3 2/0
[Sysname-T3 2/0] t1 1 channel-set 1 timeslot-list 1,2
t1 sendloopcode
Syntax t1 line-number sendloopcode { fdl-ansi-line-up | fdl-ansi-payload-up |
fdl-att-payload-up | inband-line-up }
undo t1 line-number sendloopcode { fdl-ansi-line-up | fdl-ansi-payload-up |
fdl-att-payload-up | inband-line-up }
View CT3 interface view
Parameter line-number: T1 line number, in the range 1 to 28.
fdl-ansi-line-up: Sends ANSI-compliant LLB activation request code in the FDL to
start remote loopback.
fdl-ansi-payload-up: Sends ANSI-compliant PLB activation request code in the
FDL to start remote loopback.
fdl-att-payload-up: Sends AT&T-compliant PLB activation request code in the FDL
to start remote loopback.
inband-line-up: Sends in-band LLB activation request code compliant with the
ANSI and AT&T implementation to start remote loopback.
Description Use the
t1 sendloopcode command to set the loopback mode of the specified
far-end T1 line.
Use the
undo t1 sendloopcode command to remove the corresponding setting.
Loopback is an effective way of diagnosis. You may place a far-end device into
loopback mode either at command line on it or by sending loopback control code
to it. The types and formats of loopback control code supported on T1 interfaces
are compliant with ANSI T1.403.
Loopback can be divided into line loopback and payload loopback. They differ in
the sense that the data stream is looped back at the framer with line loopback but
not with payload loopback.
You may transmit loopback control code by using the in-band signal (the 192
effective bandwidth bits or all 193 bits of T1) or the FDL in ESF frames.
Example # Send the in-band signal on T1 line 1 on CT3 interface T3 2/0 to place the far-end
T1 line in line loopback mode.