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

237
Default
The clock mode is slave.
Views
ATM E1/T1 interface view
Default command level
2: System level
Parameters
master: Sets the clock mode as master.
slave: Sets the clock mode as slave.
Usage guidelines
When ATM E1/T1 interfaces are operating as DCEs, set the clock mode to master. When interfaces are
operating as DTEs, set the clock mode to slave.
When the ATM interfaces on two routers are connected directly through a fiber-optic cable, set the clock
mode to master at one end and to slave at the other end.
Examples
# Set the clock mode of ATM E1/T1 interface 1/0 to master.
<Sysname> system-view
[Sysname] interface atm 1/0
[Sysname-Atm1/0] clock master
clock-change auto
Use clock-change auto to enable the automatic clock mode change function on the interface. This is to
configure the interface that uses the slave clock mode to automatically switch to the master clock mode
when receiving an alarm indication signal (AIS)/loss of signal (LOS)/loss of frame (LOF) alarm. After the
alarm is cleared, the interface automatically switches back to the user-configured clock mode.
Use undo clock-change auto to disable the automatic clock mode change function. If the interface has
already switched its clock mode, this command restores the user-configured clock mode for the interface.
Syntax
clock-change auto
undo clock-change auto
Default
Automatic clock mode change is disabled.
Views
ATM E1 interface view
Default command level
2: System level
Parameters
auto: Enables automatic clock mode change for the interface.