R0106-HP MSR Router Series Interface Command Reference(V7)

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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.
Usage guidelines
Loopback is an effective method of diagnosis. You can place a far-end device into loopback mode either
at the 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 can 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.
Examples
# Send the in-band signal on T1 line 1 on T3 2/4/0 to place the far-end T1 line in line loopback mode.
<Sysname> system-view
[Sysname] controller t3 2/4/0
[Sysname-T3 2/4/0] t1 1 sendloopcode inband-line-up
t1 show
Use t1 show to have a quick look at the line state of a T1 line on a CT3 interface.
Syntax
t1 line-number show
Views
CT3 interface view
Predefined user roles
network-admin
Parameters
line-number: Specifies a T1 line number in the range of 1 to 28.
show: Displays the physical line state of the specified T1 line.
Examples
# Display line state of T1 line 1 on T3 2/4/0.
<Sysname> system-view
[Sysname] controller t3 2/4/0
[Sysname-T3 2/4/0] t1 1 show
T3 2/4/0 CT1 1: up
Frame-format: ESF, clock: slave, loopback: not set
FDL Performance Report: disabled
Transmitter is sending RAI
Receiver alarm state is LOF
Line loop back activate code using inband signal last sent
BERT state:(stopped, not completed)
Test pattern: 2^11, Status: Not Sync, Sync Detected: 0