01-08 Clock Configuration

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Operation Manual - PVU Volume Contents

Issue 02 (2007-03-20) Huawei Technologies Proprietary i

Contents

8 Clock Configuration..................................................................................................................8-1

8.1 Introduction to Clock .................................................................... ................................................................ 8-2

8.2 Introduction to Clock Configuration Commands ................................................................ ..........................8-2

8.3 Detailed Description of Clock Configuration................................................................................................8-2

8.3.1 Configuring a Clock Source.................................................................................................................8-2

8.3.2 Setting the Priority of a Clock Source..................................................................................................8-3

8.4 Configuration Example .................................................................... ............................................................. 8-4


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Figures

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Operation Manual - PVU Volume

ii Huawei Technologies Proprietary Issue 02 (2007-03-20)

Figures

Figure 8-1 Networking diagram of the clock configuration........... .................................................................... 8-4


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Operation Manual - PVU Volume Tables

Issue 02 (2007-03-20) Huawei Technologies Proprietary iii

Tables

Table 8-1 Commands for configuring a clock ........................................................................ ............................8-2


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Operation Manual - PVU Volume 8 Clock Configuration

Issue 02 (2007-03-20) Huawei Technologies Proprietary 8-1

8 Clock ConfigurationAbout This Chapter

The following table lists the contents of this chapter.

Section… Describes…

8.1 Introduction to Clock The working procedure of the master-slave

synchronization

8.2 Introduction to ClockConfiguration Commands

The commands for configuring a clock

8.3 Detailed Description ofClock Configuration How to configure and set the priority of a clock source

8.4 Configuration Example An example of configuring a clock source


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8-2 Huawei Technologies Proprietary Issue 02 (2007-03-20)

8.1 Introduction to Clock

The UA5000 uses the master-slave synchronization mode. The working procedure is asfollows.

1. The UA5000 extracts clock source signals from an E1 port connecting with upper-layerequipment. The clock source with the highest priority will be used as the system clock.

2. The UA5000 sends the clock signals to all service cards through the backplane.

3. Service cards send the clock signals to the lower-layer network element.

Besides extracting clock signals from an E1 port, the PVU card can also derives clock signalsfrom a BITS clock.

The quality of clock signals will affect the system performance. Therefore, you need to

configure the system clock before configuring services.

8.2 Introduction to Clock Configuration Commands

Table 8-1 lists the commands for configuring a clock.

Table 8-1 Commands for configuring a clock

To… Use… In…

Configure a system clock source clock source Global config mode

Delete a system clock source undo clock source Global config mode

Query the settings of system clock sources display clock source Global config mode

Configure the clock priority clock priority Global config mode

8.3 Detailed Description of Clock Configuration

The clock configuration includes:

Configuring a Clock Source

Setting the Priority of a Clock Source

8.3.1 Configuring a Clock Source

To set a clock source, use the clock source command. The system supports up to 10 clock

sources.

A PVU card provides eight E1 ports and two BITS ports (BITS0 and BITS1). It can extractclock signals from these ports.


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To extract clock signals from E1 port 0/5/0 and BITS0, and set the clock extracted from E1 portas clock source 0, and that from BITS0 as clock source 1, do as follows:

huawei(config)#clock source

{ srcindex }:0

{ frameid/slotid/portid|bitsid }:0/5/0 Clock source set succeeded

huawei(config)#clock source

{ srcindex }:1

{ frameid/slotid/portid|bitsid }:bits0

Clock source set succeeded

To delete a clock source, use the undo clock source command.

To query the settings of clock sources, use the display clock source command.

8.3.2 Setting the Priority of a Clock Source

After a clock source is configured, its priority must be specified. When there are multiple clocksources, the system will select the one with the highest priority as the reference clock source.

To set the priority sequence of the clock sources, use the clock priority { p0 / p1 / p2 / p3 / p4 / p5 / p6 / p7 / p8 / p9} command.

In the command, p0/p1/p2/p3/p4/p5/p6/p7/p8/p9 are the serial numbers of the clock sources.

They also stand for the priority sequence of the clock sources: p0 is the highest priority, while p9 is the lowest priority.

To assign the highest priority to clock source 1, and the second highest priority to clock source0, do as follows:

huawei(config)#clock priority 1/0

After the priority is set successfully, the system will lock the clock source with the highest

priority. When the clock source becomes faulty, the system will switch over to the clock sourcewith the second highest priority. When the clock source with the highest priority recovers, the

system will switch back to it.

Note the following items when setting the clock source priority:

The system will choose the port with the highest priority as the clock source regardless ofthe quality of the clock source. So, assign a higher priority for the clock source with betterquality.

The clock priority will take effect after the configuration of the clock module, and maycause the switchover of clock sources.


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8 Clock Configuration

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8.4 Configuration Example

Networking Description

Figure 8-1 shows the networking. The PVU card of the UA5000 provides V5 interfaces. The

UA5000 is connected to PSTN exchanges through the SDH/Metro transmission system.

The configuration requirements are as follows:

The input clocks of E1 ports 0/5/0 and 0/5/1 of the PVU board serve as the clock sources,with the serial numbers of 0 and 1.

Clock source 0 has the highest priority, and clock source 1 has the second highest priority.

Figure 8-1 Networking diagram of the clock configuration

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Configuration Procedure

Step 1 Set the clock source

Clock source 0 extracts clock signals from port 0/5/0.

huawei(config)#clock source 0 0/5/0

Clock source 1 extracts clock signals from port 0/5/1.

huawei(config)#clock source 1 0/5/1

Step 2 Set the priority of the clock source.

Set clock source 0 with the highest priority, and clock source 1 with the second highest priority.

huawei(config)#clock priority 0/1

Step 3 Query the status of the clock source

huawei(config)#display clock source

------------------------------------------------

Index Config Source Priority State


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------------------------------------------------

0 E1 0/5/0 0 OK

1 E1 0/5/1 1 OK

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----End

01-08 Clock Configuration

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