[ntp:questions] IEEE 1588 (PTP) at the nanosecond level?

Magnus Danielson magnus at rubidium.dyndns.org
Tue Mar 18 20:42:14 UTC 2014


On 18/03/14 02:45, Paul wrote:
> On Mon, Mar 17, 2014 at 9:33 PM, Joseph Gwinn <joegwinn at comcast.net> wrote:
>
>> Will it do 100 meters or more, in bad neighborhoods?
>
>
> I'm not the right person to ask but since it is expected to maintain
> between 2.5 and 100 nanosecond  sync with CPE nodes (cable modems) I assume
> it requires RF techniques not readily available (or cost effective) outside
> a cable plant.

The DOCSIS time interface is "fun" in that it uses two different 
frequencies to provide the transfer, so you get an interpolation 
function from relatively benign frequencies. Will make your crystal 
supplier happy.

Cheers,
Magnus



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