M. Warner Losh wrote:
GPS is also used for UTC today.  Many ntpd's are stratum 1 tied to a
GPS receiver.

I imagine two parallel time infrastructures, one synchronised to TAI,
the other to "rubber" mean universal time. Stratum 0 devices for the
latter would probably have to use radio.

So, sure, there's an infrastructure cost for a sensible time of day...

> ntpd is UTC, by definition.

I wonder how easily NTP could be generalised to transmit different
timescales without too much confusion? Using different UDP port numbers
might be one option.

Ashley Yakeley

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