Table of Contents

Chapter 1 Configuring Clock Module. 1-1

1.1 Introduction to Clock Module. 1-1

1.2 Configuring Clock Module. 1-2

1.3 Displaying Clock Module. 1-2

1.4 Clock Module Configuration Example. 1-3

Chapter 1  Configuring Clock Module

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

l           Introduction to Clock Module

l           Configuring Clock Module

l           Displaying Clock Module

l           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:

Figure 1-1 Mapping between the line clock source and the slot

1.2  Configuring Clock Module

Follow these steps to configure clock module:

1.3  Displaying Clock Module

1.4  Clock Module Configuration Example

I. Network requirements

l           Two S9508 switches Switch A and Switch B are connected by POS interfaces. Switch A equipped with clock monitoring module on its SRPU, but Switch B not.

l           The synchronized clock of Switch A is provided by the clock monitoring module on its SRPU.

l           Switch B adopts the line clock from Switch A to synchronize with the SDH line of Switch A.

II. Network diagram

Figure 1-2 Diagram for the system clock configuration

III. Configuration procedure

l           Configurations on the Switch A (configure the master clock).

# Set the interface POS 1/1/1 to work in master clock mode, using local clock signals.

<Sysname> system-view

[Sysname] interface pos 1/1/1

[Sysname-Pos1/1/1] clock master

l           Configurations on the Switch B (configure the slave clock).

# Set the line clock source input interface on Switch B to POS 1/1/1.

<Sysname> system-view

[Sysname] clock lpuport pos 1/1/1

# Set the interface POS 1/1/1 to work in slave clock mode.

[Sysname] interface pos 1/1/1

[Sysname-Pos1/1/1] clock slave

# Enable the clock source from POS 1/1/1; set the clock to work in manual mode and adopt clock source 8, which corresponds to slot 1 (refer to Figure 1-1).

[Sysname] clock manual source 8

Through the above configurations, all the other POS interface cards get the same clock frequency derived by the clock monitoring module from the port 1 line clock of the POS interface card in slot 1. In this way, all the service cards on the device can get precise, reliable, synchronized SDH line interface clock signals.