3com MSR 20-20 참조 매뉴얼

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HAPTER

 15: T1-F I

NTERFACE

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ONFIGURATION

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OMMANDS

You may use this command to adapt signal waveform to different transmission 
conditions such as the quality of the signal received by the receiver. If the signal 
quality is good, you can just use the default setting.

# Set the cable length to 40.5 meters (133 feet) on T1-F interface Serial 2/0.

<Sysname> system-view

[Sysname] interface serial 2/0

[Sysname-Serial2/0]ft1 cable short 133ft 

ft1 clock { master | slave }

T1-F interface view

master: Adopts the internal clock as the clock source.

slave: Adopts the line clock as the clock source.

Use the ft1 clock command to configure the clock source for the T1-F interface.

Use the undo ft1 clock command to restore the default, that is, line clock.

When the T1-F interface is working as DCE, choose the internal clock for it. When 
it is working as DTE, choose the line clock for it.

When the T1-F interfaces on two routers are directly connected, one interface 
must work in master clock mode to provide the clock source while the other in 
slave clock mode to accept.

When the T1-F interface on your router is connected to an exchange, it is working 
as DTE and therefore must be configured with the slave clock mode to accept the 
line clock provided by the exchange working as DCE.

# Use the internal clock as the clock source on T1-F interface Serial 2/0.

<Sysname> system-view

[Sysname] interface serial 2/0

[Sysname-Serial2/0] ft1 clock master 

ft1 code { ami | b8zs }

T1-F interface view