Cost-effectivenesss of highly-accurate clocks for NTP

joel jaeggli joelja at
Mon May 16 00:28:35 UTC 2016

On 5/15/16 10:05 AM, Eric S. Raymond wrote:
> Mel Beckman <mel at>:
>> The upshot is that there are many real-world situations where
>> expensive clock discipline is needed. But IT isn't, I don't think,
>> one of them, with the exception of private SONET networks (fast
>> disappearing in the face of metro Ethernet).
> Thank you, that was very interesting information.  I'm not used to thinking
> of IT as a relatively low-challenge environment!
> You're implicitly suggesting there might be a technical case for
> replacing these T1/T3 trunks with some kind of VOIP provisioning less
> dependent on accurate time synch.  Do you think that's true?

APCO  and TETRA trunked radio  are mature systems, they do carry data,
but are somewhat lower bandwidth. Being TDM they are dependent on
accurate clocks.

LTE systems are used or envisioned being used for high bandwidth


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