R3303-HP HSR6800 Routers Interface Command Reference

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Default
16-bit CRC is adopted.
Views
Synchronous serial interface view
Default command level
2: System level
Parameters
16: Specifies 16-bit CRC.
32: Specifies 32-bit CRC.
none: Disables CRC.
Examples
# Configure synchronous serial interface Serial 2/0/0 to adopt 32-bit CRC.
<Sysname> system-view
[Sysname] interface serial 2/0/0
[Sysname-Serial2/0/0] crc 32
detect
Use detect to enable data carrier detection and level detection on the serial interface.
Use undo detect to disable data carrier detection and level detection on the serial interface.
Syntax
detect { dcd | dsr-dtr }
undo detect { dcd | dsr-dtr }
Default
Data carrier and level detection is enabled on serial interfaces.
Views
Synchronous serial interface view
Default command level
2: System level
Parameters
dsr-dtr: Detects DSR (data set ready) and DTR (data terminal ready) signals of DSU/CSU (data service
unit/channel service unit).
dcd: Detects the DCD (data carrier detect) signal of the DSU/CSU on the serial interface.
Usage guidelines
When determining whether a synchronous serial interface is up or down, the system detects by default
the DSR signal, DCD signal, and presence of cable connection. Only when the three signals are all valid
is the interface regarded as up. If level detection is disabled, the system considers that the interface is up
with both DTR and DSR being up after detecting the cable connection.