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

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Usage guidelines
When automatic clock mode switchover is enabled, the interface automatically switches to the master
clock mode when both of the following conditions are true:
• The interface uses the slave clock mode.
• The interface receives an alarm indication signal (AIS), loss of signal (LOS), or loss of frame (LOF)
alarm.
After the alarm is cleared, the interface automatically switches back to the user-configured clock mode.
When automatic clock mode switchover is disabled, the interface uses the user-configured clock mode.
Examples
# Enable automatic clock mode switchover for E1-F interface Serial 2/1/0.
<Sysname> system-view
[Sysname] interface serial 2/1/0
[Sysname-Serial2/1/0] clock-change auto
Related commands
fe1 clock
crc
Use crc to configure CRC mode for an E1-F interface.
Use undo crc to restore the default.
Syntax
crc { 16 | 32 | none }
undo crc
Default
The CRC mode for an E1-F interface is 16-bit CRC.
Views
E1-F interface view
Predefined user roles
network-admin
Parameters
16: Adopts 16-bit CRC.
32: Adopts 32-bit CRC.
none: Disables CRC.
Examples
# Adopt 32-bit CRC on E1-F interface Serial 2/1/0.
<Sysname> system-view
[Sysname] interface serial 2/1/0
[Sysname-Serial2/1/0] crc 32