Chapter 1 Clock Monitoring Configuration; Clock Monitoring Module Overview; Introduction To Clock Monitoring Module - H3C S9500 Series Operation Manual

Operation Manual – Clock Monitoring
H3C S9500 Series Routing Switches

Chapter 1 Clock Monitoring Configuration

When configuring clock monitoring module, go to these sections for information you are
interested in:

Clock Monitoring Module Overview

Clock Monitoring Module Configuration Task List
Configuring Working Mode of the Clock Monitoring Module of the SRPU
Configuring Reference Source Priority
Configuring SSM for Reference Sources
Stopping the Clock Monitoring Module from Warming Up
Setting the Input Port of the Line Clock (LPU Port)
Displaying and Maintaining Clock Monitoring Module
Clock Monitoring Module Configuration Example
1.1 Clock Monitoring Module Overview
This section covers these topics:

Introduction to Clock Monitoring Module

Classification of Clock Sources
Reference Source Level
Working Mode of the Clock Monitoring Module
Working Mode of the Port Clock
1.1.1 Introduction to Clock Monitoring Module
Clock monitoring module is responsible for providing highly-precise, highly-reliable
SDH (synchronous digital hierarchy) line interface 38.88 MHz clock signals for different
service interface cards. It implements such functions as input clock source automatic
selection, software phase-lock, and real-time monitoring of the clock status of the
interface card.
Currently, the clock monitoring module supports 18 reference clock sources (referred to
as reference source hereafter), among which the first and the second are Bits clock
sources and others are line clock sources. Each reference source corresponds to a slot.
The specific relationship is decided by device hardware. The following figure shows the
reference-slot relationship of the S9500 series switches:
Chapter 1 Clock Monitoring Configuration
1-1