R2511-HP MSR Router Series Interface Command Reference(V5)

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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.
Usage guidelines
Loopback is an effective way of diagnosis. You can 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 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 CT3 interface T3 2/0 to place the far-end T1 line in line
loopback mode.
<Sysname> system-view
[Sysname] controller t3 2/0
[Sysname-T3 2/0] t1 1 sendloopcode inband-line-up
t1 set clock
Use t1 set clock to configure the clock source for a T1 line on the CT3 interface.
Use undo t1 set clock to restore the default.
Syntax
t1 line-number set clock { master | slave }
undo t1 line-number set clock
Default
The clock source for a T1 line on the CT3 interface is line clock.
Views
CT3 interface view
Default command level
2: System level
Parameters
line-number: T1 line number in the range of 1 to 28.
master: Adopts the internal clock as the clock source on the T1 line.
slave: Adopts the line clock as the clock source on the T1 line.