Procedure
Step 1
In the NE Explorer, select an NE and choose
Configuration
>
Clock
>
Physical Layer
Clock
>
Clock Source Priority
from the Function Tree.
Step 2
Click
Query
to query the existing clock source.
Step 3
Click
Create
. In the
Add Clock Source
dialog box, select a new clock source and click
OK
.
Step 4
Optional:
If an external clock source is selected, select
External Clock Source Mode
according
to the type of external clock signals. In the case of the 2 Mbit/s clock, specify the
Synchronous
Status Byte
to deliver the SSM message.
Step 5
Select a clock source and click
or
to adjust its priority level. The clock
sources are arranged in the descending order. The clock source at top is the preferred clock
source for the NE.
NOTE
Internal clock sources have the lowest priority because of their low precision.
Step 6
Click
Apply
. Then, click
Close
in the
Operation Result
dialog box indicating that the operation
succeeded.
NOTE
If the clock trace relation changes according to the change of the clock source, the
Prompt
dialog box is
displayed, asking you whether to refresh the clock trace relation. Click
OK
. If
Disable Prompting Next
Time
is selected, the
Prompt
dialog box is not displayed even if the clock trace relation changes.
----End
2.7.2 Configuring the Clock Source Protection
On a complicated clock network, you need to configure the clock protection for all the NEs.
After you set the clock source and specify the clock priority level for the NEs, you can enable
the standard SSM or extended SSM protocol to prevent the NEs from tracing an incorrect clock
source.
Prerequisite
You must be an NM user with "NE operator" authority or higher.
Procedure
Step 1
In the NE Explorer, select an NE and choose
Configuration
>
Clock
>
Physical Layer
Clock
>
Clock Subnet Configuration
from the Function Tree.
Step 2
Click the
Clock Subnet
tab. Click
Query
to query the existing parameter settings.
Step 3
Select
Start Standard SSM Protocol
or
Start Extended SSM Protocol
.
NOTE
The same SSM protection protocol must be used for the NEs within the same clock protection subnet.
Step 4
Set the subnet number of the clock subnet to which the NE is associated.
2 Creating the Network
OptiX OSN 550 Multi-Service CPE Optical Transmission
System
Configuration Guide
2-22
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 02 (2011-06-30)