H3C S9500 Series Operation Manual page 1477

Operation Manual – Clock Module
H3C S9500 Series Routing Switches
Chapter 1 Configuring Clock Module
When configuring clock module, go to these sections for information you are interested
in:
Introduction to Clock Module
Configuring Clock Module
Displaying Clock Module
Clock Module Configuration Example
1.1 Introduction to Clock Module
The clock module is responsible for providing high-precision and high-reliability
synchronous 38.88 MHz SDH clock signals for all LPUs. The clock module selects an
input clock source automatically, performs software phase-lock function, and monitors
the board status in real time. As a branch of system operation management module on
the SRPU, the clock module is responsible for passing the clock commands sent out by
the network management system and the command line to the clock board of the
SRPU, and for processing the responses from the clock board, as well as the
messages reported by the clock board.
The clock module supports the hard reset of the clock board, and supports 18 clock
sources. Every clock source matches a corresponding slot, dependent on the hardware
configuration. The following figure shows the matching relationship between the clock
source and the slot of the S9500 series switches:
S9502 S9502
S9505 S9505
S9508 S9508
S9512 S9512
Figure 1-1 Mapping between the line clock source and the slot
Chapter 1 Configuring Clock Module
1-1