3Com 3031 Command Reference Manual page 162

162 C 3: I M C
HAPTER NTERFACE ANAGEMENT OMMANDS
detect { dcd | dsr-dtr }
undo detect { dcd | dsr-dtr }
View
Synchronous serial interface view, asynchronous serial interface view
Parameter
dsr-dtr: Detects DSR and DTR signals of DSU/CSU.
dcd: Detects the DCD signal of the DSU/CSU on the serial interface.
Description
Using the detect command, you can enable data carrier detection as well as level
detection on a serial interface. Using the undo detect command, you can disable
data carrier detection as well as level detection on the serial interface.
By default, serial interfaces are enabled to make data carrier and level detection.
If this function has been disabled on a serial interface, the system will not detect
the DCD and DSR/DTR signals when determining the state (UP or DOWN) of the
serial interface.
Example
Disable the serial interface to make data carrier detection.
[3com-Serial0/0/0]undo detect dcd
idle-mark Syntax
idle-mark
undo idle-mark
View
Synchronous serial interface view
Parameter
None
Description
Using the idle-mark command, you can set the line idle-mark of the synchronous
serial interface to "FF". Using the undo idle-mark command, you can restore the
line idle-mark of the synchronous serial interface to "7E".
Line idle-mark of synchronous serial interfaces defaults to "7E".
In normal circumstances, the synchronous serial interface uses the code "7E" to
identify the idle state of the line. However, there are still some devices that use