3com MSR 20-20 참조 매뉴얼

t1 t1-number set clock { master | slave }

undo t1 t1-number set clock

CPOS interface view

t1-number: Number of a T1 channel on the CPOS, in the range 1 to 84.

Master: Set the clock mode of the T1 channel to master.

slave: Set the clock mode of the T1 channel to slave.

Use the t1 set clock command to configure the clock mode of the T1 channel.

Use the undo t1 set clock command to restore the default, that is, slave.

T1 channels on the same CPOS physical interface can use different clock modes, 
depending on connected devices. For example, when connected to a SONET/SDH 
device, a T1 channel should use the slave clock mode, and when directly 
connected to another device with fiber-optic, it can use either mode so long as the 
mode is different from the one used at the opposite end.

Note that different T1 channels of the same CPOS physical interface are 
independent of one another in terms of clock mode.

# Set the clock mode of T1 channel 1 to master.

<Sysname> system-view

[Sysname] controller cpos 1/0

[Sysname-Cpos1/0] t1 1 set clock master 

t1 t1-number set frame-format { esf | sf }

undo t1 t1-number set frame-format

CPOS interface view

t1-number: Number of a T1 channel on the CPOS interface, in the range 1 to 84.

esf: Sets the T1 channel to use the extended super frame (ESF) format.

sf: Sets the T1 channel to use the super frame (SF) format.

Use the t1 set frame-format command to set the framing format for T1 
channel.