R2511-HP MSR Router Series Interface Command Reference(V5)

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undo clock
Default
The clock mode is slave.
Views
POS interface view
Default command level
2: System level
Parameters
master: Sets the clock mode to master.
slave: Sets the clock mode to slave.
Usage guidelines
POS interfaces support the following clock modes:
• Master—Uses internal clock signal.
• Slave—Uses line clock signal.
When two POS interfaces are directly connected, you must configure the two ends with different clock
modes.
When connected to a SONET/SDH device, the POS interface must use the slave clock. The SONET/SDH
network clock is more precise than the internal clock source of the POS interface.
Examples
# Set the clock mode of POS 1/0 to master.
<Sysname> system-view
[Sysname] interface pos 1/0
[Sysname-Pos1/0] clock master
crc
Use crc to set the CRC length on a POS interface.
Use undo crc to restore the default.
Syntax
crc { 16 | 32 }
undo crc
Default
The CRC length is 32 bits.
Views
POS interface view
Default command level
2: System level
Parameters
16: Sets the cyclic redundancy check (CRC) length to 16 bits.