3com MSR 20-20 참조 매뉴얼

<Sysname> system-view

[Sysname] controller e3 2/0

[Sysname-E3 2/0] 

crc { 16 | 32 | none }

Synchronous serial interface view

16: Adopts 16-bit CRC.

32: Adopts 32-bit CRC.

none: Adopts no CRC.

Use the crc command to configure CRC mode for a synchronous serial interface 
formed by CE3 interfaces.

Use the undo crc command to restore the default, that is, 16-bit CRC.

e1 channel-set, e1 unframed, using (CT3 interface view).

# Apply 32-bit CRC to a serial interface formed on interface E3 2/0 in 
unchannelized mode.

<Sysname> system-view

[Sysname] controller e3 2/0

[Sysname-E3 2/0] using e3

[Sysname-E3 2/0] quit

[Sysname] interface serial 2/0/0:0

[Sysname-Serial2/0/0:0] crc 32 

# Apply 16-bit CRC to a serial interface formed on interface E3 2/0 in 
unchannelized mode.

<Sysname> system-view

[Sysname] controller e3 2/0

[Sysname-E3 2/0] t1 3 channel-set 5 timeslot-list 1-20

[Sysname-E3 2/0] quit

[Sysname] interface serial 2/0/3:5

[Sysname-Serial2/0/3:5] crc 16 

display controller e3 [ interface-number ]

Any view