3com MSR 20-20 참조 매뉴얼

capability, only up to 256 serial interfaces are allowed on one CPOS physical 
interface.

# Set E1 channel 3 on interface CPOS 1/0 to operate in unframed mode.

<Sysname> system-view

[Sysname] controller cpos 1/0

[Sysname-Cpos 1/0] e1 3 unframed 

flag { j0 j0-string | j1 j1-string | c2 c2-value }

undo flag { j0 | j1 | c2 }

CPOS interface view

j0 j0-string: Specifies the regeneration section trace message. The j0-string 
argument is a string of 1 to 15 characters. The system default is 0x01.

j1 j1-string: Specifies the path trace message. The j1-string argument is a string of 
1 to 15 characters. The system default is NetEngine.

c2 c2-value: Specifies the path signal label byte. The c2-value argument is a 
hexadecimal number in the range 0 to FF. The system default is 0x02.

Use the flag command to set the overhead byte of SONET/SDH frames.

Use the undo flag command to restore the default.

SONET/SDH frames provide a variety of overhead bytes for operation and 
maintenance (OAM) such as layered management on transmission networks. j1, j0 
and c2 are used to support interoperability between devices in different countries 
and areas or from different vendors.

# Set J1 to aa on interface CPOS 1/0.

<Sysname> system-view

[Sysname] controller cpos 1/0

[Sysname-Cpos1/0] flag j1 aa 

frame-format { sdh | sonet }

CPOS interface view