[time-nuts] Help identifying oscillator

Peter Loron peterl at standingwave.org
Tue Nov 30 08:55:39 UTC 2010


Ah, interesting! Thanks for the info.

-Pete

On Nov 28, 2010, at 3:00 AM, K. Szeker wrote:

> Hi all,
> hese is a Synchron TDMA, or a DBS frequency...
> http://www5e.biglobe.ne.jp/~kaorin57/Synchronous%20TDMA%20Direct%20Satellite%20Broadcasting%20Network%20%28English%29.pdf
> http://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F8429%2F26550%2F01182532.pdf%3Farnumber%3D1182532&authDecision=-203
> Regards,
> Karesz
> 
> 2010/11/28 Magnus Danielson <magnus at rubidium.dyndns.org>
> 
>> On 11/28/2010 09:42 AM, Poul-Henning Kamp wrote:
>> 
>>> In message<75891FAD-425D-4081-999A-3864A6057209 at standingwave.org>, Peter
>>> Loron
>>> writes:
>>> 
>>> Hello folks. I have a box of oscillators that I'm trying to get the
>>>> datasheet for. Google and the CTS website haven't been helpful.
>>>> 
>>>> Most interestingly, this thing has 5 pins. The label on the box says the
>>>> customer was Agilent.
>>>> 
>>>> Any ideas? Thanks.
>>>> 
>>> 
>>> The frequency sounds like something that could be related to SONET
>>> communications...
>>> 
>> 
>> Doesn't match up very well... 42,192 MHz doesn't have suitably even numbers
>> to any of the rates. Factorisation gives
>> 
>> 42192 kHz = 2^4 * 3^2 * 293 kHz
>> 
>> The SDH/SONET rate of 155,52 Mb/s breaks up as
>> 
>> 155520 kHz = 2^7 * 3^5 * 5 kHz
>> 
>> Other SDH/SONET clocks is /3, /8, *4, *16, *64, *256 variants of the above,
>> and sometimes for internal use other sub-divisions. The /8 variant is often
>> seen as 19,44 MHz.
>> 
>> I can't come up with a suitable PDH rate either.
>> 
>> We are looking for a system where 293 turns up, and SDH/SONET isn't it.
>> 
>> Cheers,
>> Magnus - does SDH/SONET clocking for a living
>> 



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