3com MSR 20-20 참조 매뉴얼

au-4: Gets AUG through AU-4.

Use the multiplex mode command to set AUG multiplexing mode.

Use the undo multiplex mode command to restore the default, that is, au-4.

SDH provides two payload mapping/multiplexing solutions: ANSI and ETSI.

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ANSI uses the AU-3 multiplexing scheme, where the lower-order payload is 
aggregated into the VC-3 higher-order path. VC-3 plus an AU pointer forms 
AU-3. Three such AU-3s can be synchronized and multiplexed to form one 
AUG.

■

ETSI uses the AU-4 multiplexing scheme, where the lower-order payload is 
aggregated into the VC-4 higher-order path. VC-4 plus an AU pointer forms an 
AU-4. This AU-4 can be synchronized and multiplexed to form one AUG.

When the CPOS interface is operating in SDH mode, you can choose to multiplex 
AUG to AU-4 or AU-3 by using the multiplex mode command. When the CPOS 
interface is operating in SONET mode, AUG can be multiplexed only to AU-3 and 
the multiplex mode command is invalid in this case.

# In SDH mode, multiplex AUG to AU-3.

<Sysname> system-view

[Sysname] controller cpos 1/0

[Sysname-Cpos1/0] frame-format sdh

[Sysname-Cpos1/0] multiplex mode au- 

CPOS interface view

None

Use the shutdown command to shut down the CPOS physical interface.

Use the undo shutdown command to bring up the CPOS physical interface.

By default, the CPOS physical interface is up.

The shutdown command on the CPOS physical interface shuts down all E1/T1 
channels and serial interfaces formed by timeslot bundles. They stop transmitting 
and receiving data as a result. To bring up them, perform the undo shutdown 
command on the CPOS physical interface.