[time-nuts] Symmetricom chip scale atomic clock

Bob Camp lists at rtty.us
Thu Apr 24 20:41:17 EDT 2014


Hi

I seem to have been in exactly the same position many times before and also wish you well in resolving this (as I’m *certain* will be the case). 

Bob

On Apr 24, 2014, at 7:48 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

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