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CLK NO TRACE MODE alarm on OSN 3500

Latest reply: Feb 10, 2022 09:28:41 327 3 0 0 0

Hello, everyone!

This post will tell you one issue for CLK NO TRACE MODE alarm on OSN 3500.


Problem description

The customer reported OSN3500 reporting CLK_NO_TRACE_MODE alarm and require to rectify the alarm. 

  

Handling procedure

Check the alarm board SXCSA board was reporting the alarm on OSN 3500. From the configuration check the clock parameters to identify the if the parameters are configured OK or not.

From the NMS check the parameters fromthe following path

NE>>NE Explorer>>Clock>>Physical Layer Clock>>Clock Source Priority

Check the clock source and found NE was running on Internal Clock Source. For the specific NE must be configured with G.811 standard clock source.


Root cause

Alarm was due to NE not configured with G.811 clock standard.


Solution

For the rectification we have to configure the clock source for the NE.

1. NE>>NE Exporer>>Clock>>Physical Layer Clock>>Clock Source Priority and choose Create Tab from lower right corner.

2. Select the source line interface configured on NE from where NE set to get clock . Configure the source board with G.811 standard clock from Add Clock Source window by selecting the relevant slot board.

3. Press Apply Tab to configure the clock source.

4. Set the clock source priority to 1 position by up/down arrows and press apply again.

5. From Clock Subnet Configuations>>Clock Subnet>>Start Standard SSM Protocol and check the option and press Apply tab.

6. Check the Clock Synchronization Status>>Query to query the current clock status. It must be G.811 Reference Clock in Quality Info tab. 


That's all, I welcome everyone to leave a message and exchange in the comment area!

 

Thank you!

How many NE'S can follow one external clock source
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liqiang185
liqiang185 Created Feb 10, 2022 09:24:40 (0) (0)
There is no limit, but it is recommended that the number of cascading levels not exceed 10. The clock quality deteriorates after being forwarded by more than 10 NEs. In this case, clock source regeneration is required.  
Posted by user_4364655 at 2021-08-27 09:44 How many NE'S can follow one external clock source

Phase-locked source output of external clocks is a method of obtaining external clock sources. In order to prevent wander in clock signals after they traverse multiple NEs, compensation must be provided for the clock signals in a long clock chain. According to ITU-T G.781, clock signals must be compensated in a long clock chain that contains 20 or more NEs. Considering factors such as the transmission distance supported by fibers in practical application, clock signals are compensated usually after they traverse 10 NEs.

As shown in Figure, n NEs comprise a long transmission chain and BITS1 is used as the clock synchronization source. After the signals are transmitted over several NEs, the BITS1 clock signals are degraded. To restore the clock quality to the normal level, the clock from BITS1 to NEm must be sent to BITS2 for compensation. After the compensation, the clock from BITS2 to NEm must be used as the clock sources for the downstream NEs. Also, the 2M phase-locked source of NEm needs to be configured as the input clock source of the west line board, to ensure that the entire network uses the clock from BITS2 as the clock synchronization source.

Figure Typical application
tt_wdm_fd_2045_fig02.png

To ensure that BITS2 can receive clock signals from NEm, the attributes of the external clock from NEm must be configured. That is, the attributes of the external clock from NEm must be the same as the attributes of the clock provided by BITS2.


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