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3com MSR 20-20 참조 매뉴얼

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<Sysname> system-view
[Sysname] interface serial 1/0
[Sysname-Serial1/0] country-code china 
crc
Syntax
crc { 16 | 32 | none }
undo crc
View
Synchronous serial interface view
Parameter
16: Specifies 16-bit CRC.
32: Specifies 32-bit CRC.
none: Disables CRC.
Description
Use the crc command to set the CRC mode.
Use the undo crc command to restore the default.
By default, 16-bit CRC is adopted.
These two commands are not available to sub-serial interfaces and 
synchronous/asynchronous serial interfaces operating as asynchronous interfaces.
Example
# Configure to adopt 32-bit CRC.
<Sysname> system-view
[Sysname] interface serial 0/0/0
[Sysname-Serial0/0/0] crc 32 
detect
Syntax
1 Asynchronous serial interface
detect dsr-dtr
undo detect dsr-dtr
2 Synchronous serial interface
detect { dcd | dsr-dtr }
undo detect { dcd | dsr-dtr }
View
Synchronous serial interface view, asynchronous serial interface view