[time-nuts] Symmetricom chip scale atomic clock

Magnus Danielson magnus at rubidium.dyndns.org
Thu Apr 24 23:48:56 UTC 2014


I recognize this situation so well. Feel with you on the issue and hope 
you find that it resolve itself nicely.


On 04/24/2014 10:50 PM, SAIDJACK at aol.com wrote:
> Hello everyone,
> let me address the below claims and commentary which was posted without
> first consulting with us.
> Microsemi has recently seen a slightly higher failure rate of the CSAC
> oscillators than expected. A small percentage of our customers have been
> adversely affected by this issue. We have been, and will continue to take care
> of this issue when it happens to units we sold by doing a warranty exchange
> of  the CSAC for the affected customer unit, even if it should fall out of
> its normal warranty period.
> We believe in supporting our customers to the maximum extent possible, and
> of course want to deliver a product that has the highest level of quality
> possible. That said, we must remember that the CSAC technology is a ground
> breaking, never-before-done in commercial quantities, absolutely new type of
>   oscillator technology, and being at the forefront of such a technology
> sometimes  means there is a bit of a learning curve to deal with. This is one
> of the main  reasons why no one else in the world besides Microsemi makes
> CSAC type products  for commercial sale.
> So all in all, if a customer unit should get affected by this problem then
> the issue will be addressed by us and Microsemi with a quick turn around
> and a "no questions asked" approach, and we hope that this approach sets us
> positively apart from the competition.
> Lastly, we received the below comments/explanation from Microsemi  about
> this issue which we have permission to share with you, and this  should help
> alleviate the problem for new orders.
> Sincerely,
> Said
> ****************************************************************************
> ****************************************
> Some Symmetricom (now  Microsemi) Chip Scale Atomic Clocks have shown a
> failure mode that will manifest  itself as an inability of the clock to achieve
> atomic lock.  If the CSAC’s  telemetry string is monitored, the failure
> mode will show up as a Status Level  8.  Microsemi’s investigation into the
> problem uncovered three distinct  root causes, although the symptom the user
> observes is always a Status Level 8,  regardless of which root cause is the
> underlying issue.  It is important to  note that all three root causes are
> process issues, not design  issues.
> All three root causes  have been addressed, and Microsemi is currently
> producing CSAC’s with all three  fixes implemented.  A full re-qualification of
> the CSAC is also being done,  to ensure that the fixes are effective.  CSAC’
> s already in the field that  exhibit this failure mode have been, and will
> continue to be, replaced under  warranty.
> ****************************************************************************
> ****************************************
> In a message dated 4/24/2014 10:16:25 Pacific Daylight Time,
> lester at veenstras.com writes:
> Affected Products: Jackson Labs or Symmetricom time/frequency  reference
> boards based on Symmetricom chip scale atomic  clock
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