Detect Dsr-Dtr - 3Com 3C13618 Command Reference Manual

3Com Router Command Reference Guide — V1.00
Example
# Disable the data carrier detection at the serial interface.
[3Com-Serial0]undo detect dcd

3.1.8 detect dsr-dtr

Syntax
detect dsr-dtr
undo detect dsr-dtr
View
Serial interface view
Parameter
None
Description
Using the detect dsr-dtr command, you can enable the electrical level detection on
the serial interface. Using the undo detect dsr-dtr command, you can disable this
detection.
By default, the electrical level detection on serial interfaces is enabled.
If undo detect dsr-dtr is set, then the system will only check if the serial interface is
connected with the external cable, and will automatically report to the user the UP
and DOWN states of the serial interface. If detect dsr-dtr is set, then the system will
not only check if the serial interface is connected with the external cable, but also
detect the DSR signal. Only when this signal is valid, will the system determine this
serial interface is UP, otherwise it will determine that the interface is DOWN.
For related commands, see detect dcd.
Example
# Disable the electrical level detection at the serial interface.
[3Com-Serial0]undo detect dsr-dtr
24