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Re: How to decrease wander in SDH

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me0223@yahoo.com wrote:

> On Oct 9, 9:25 am, Vladimir Vassilevsky <nos...@nowhere.com> wrote:
> 
>>fl wrote:
>>
>>>Hi,
>>>On SDH signal, clock jitter can be removed by PLL. How about wander?
>>>The definition of wander is below 10 Hz. I am curious on how to
>>>decrease it.
>>
>>Kalman.
>>  
> Kalman to do what?  Idiot answer!
> Try bumping it with a long term stable clock!
> Ask the idiot above if he has any ideas!

The anonimous pig does too much of bumping around the clock. If he does 
it for stable, it won't be long.

I design data acquisition systems for geophysics. This is one of my works:

http://www.abvolt.com/projects_and_solutions/data_acquisition_board.htm

Among other options, it supports for clock synchronization via wired or 
wireless channels. Timing accuracy is one of the performance parameters, 
and it took some effort to get the algorithms right.

As for PLL, it is in no way optimal. The only virtue of PLL is 
simplicity. If the goal is the best tracking accuracy, then Kalman-like 
control algorithm is the way to go. The issue of a slow variations of 
phase is tackled by this approach very well.


Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com

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Thread

How to decrease wander in SDH fl <rxjwg98@gmail.com> - 2011-10-09 04:47 -0700
  Re: How to decrease wander in SDH Vladimir Vassilevsky <nospam@nowhere.com> - 2011-10-09 11:25 -0500
    Re: How to decrease wander in SDH me0223@yahoo.com - 2011-10-09 09:54 -0700
      Re: How to decrease wander in SDH Vladimir Vassilevsky <nospam@nowhere.com> - 2011-10-09 12:52 -0500
        Re: How to decrease wander in SDH me0223@yahoo.com - 2011-10-09 11:08 -0700
      Re: How to decrease wander in SDH brent <bulegoge@columbus.rr.com> - 2011-10-09 11:05 -0700
  RE: How to decrease wander in SDH NComm, Inc. <sales@ncomm.com> - 2011-10-11 00:12 +0000

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