[time-nuts] Raspberry Pi TCXO Hat

[Bob kb8tq]

Hi

Congratulations !!!

You have just invented Sync-E. Seems like *maybe* somebody beat you to it ….

https://en.wikipedia.org/wiki/Synchronous_Ethernet <https://en.wikipedia.org/wiki/Synchronous_Ethernet>

Turns out it is one way to get *frequency* to a device (like a cell site). Just how well
it does is (as always) a “that depends” sort of thing. 

Bob

> On Nov 2, 2019, at 5:44 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
> 
> artgodwin at gmail.com said:
>> Also - I'm unsure of the benefit of having a TCXO for the ethernet clock
>> unless it runs so hot that ethernet can't sync using the usual uncompensated
>> crystal. Is there some benefit I'm not seeing ? 
> 
> I had similar thoughts.
> 
> One could imagine using Ethernet to distribute a clock Just tap off the 
> post-PLL receive clock.  For that to make sense, you would need to start with 
> something like a GPSDO rather than a TCXO.
> 
> Maybe you could measure the local transmit clock and send that to the receive 
> side.  I don't see how to make that work rock-solid.
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
> 
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