R0106-HP MSR Router Series Interface Command Reference(V7)

51
Default
DCD is enabled on a serial interface.
Views
Synchronous serial interface view
Predefined user roles
network-admin
Usage guidelines
When determining whether a synchronous serial interface is up, the system detects by default the DSR
signal, DCD signal, and presence of cable connection. The interface is considered up only when the
three signals are all valid.
Examples
# Enable DCD on Serial 2/1/0.
<Sysname> system-view
[Sysname] interface serial 2/1/0
[Sysname-Serial2/1/0] detect dcd
Related commands
detect dsr-dtr
detect dsr-dtr
Use detect dsr-dtr to enable level detection on a serial interface.
Use undo detect dsr-dtr to disable level detection on a serial interface.
Syntax
detect dsr-dtr
undo detect dsr-dtr
Default
Level detection is enabled on a serial interface.
Views
Synchronous serial interface view, asynchronous interface view, synchronous/asynchronous serial
interface view
Predefined user roles
network-admin
Usage guidelines
In level detection, the system detects the following items for the data service unit (DSU) or the channel
service unit (CSU):
• Data set ready (DSR) signals
• Data terminal ready (DTR) signals
If the level detection is disabled on an asynchronous serial interface, the system skips the cable detection,
and automatically reports that serial interface up event. The DTR and DSR are also reported up.