fdfdfdfd fdfdfdf wrote:
[SNIP]
>      DCD=up DSR=up DTR=up RTS=up CTS=up 
> 
> 
> what is the meaning of "dcd=up"?
> thanks.


This is an interesting reference, which contains a lot about 
Synchronous Serial ports.

http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_configuration_guide_chapter09186a0080087283.html#3961

QUOTE:
By default, when the serial interface is operating in DTE mode, 
it monitors the Data Carrier Detect (DCD) signal as the line 
up/down indicator. By default, the attached DCE device sends the 
DCD signal. When the DTE interface detects the DCD signal, it 
changes the state of the interface to up.
END QUOTE.




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