NTP Performance

Richard Laager rlaager at wiktel.com
Sat Nov 23 07:36:58 UTC 2019

On 11/23/19 1:28 AM, ASSI via devel wrote:
> Richard Laager via devel writes:
>> On 11/21/19 1:15 AM, Hal Murray wrote:
>>>> ntp1 uses the PPS refclock with a polling interval of 3 from a telecom GPSDO
>>>> (OCXO): 
>>> What brand/model?
>> Symmetricom TimeSource 3000. It's an older, end-of-life model that we've
>> had in place for a while. We have four of them in different sites, but
>> this is the only one with a server with NTP hooked up to it.
> […]
> AFAIK that model uses an antenna with an integrated GPS receiver
> frontend and then sends the IF down the cable.  That's how you get to
> have absurdly long cable runs with relatively cheap coax cable.  But
> that unit came in many configurations, so best to check what you have
> first.

I recall there being some talk about the antenna being incompatible with
the next newer model. So if it's something weird like that, that would
make sense. That's good to know, as that makes a failure in the
"antenna" more likely than normal, given that there is more going on in


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