Heiko Gerstung wrote:
Jeff W. Boote schrieb:
I have some network locations where I have no way to access GPS or
CDMA. But, I would still like to have a very accurate time source. (I
would like sub-microsecond accuracy from NTPD if I can get it.) These
locations are in telco-hotels, so they are typically very well
shielded making any broadcast technology unworkable. (We are not using
sonet - so getting time from there is also not an option.)
<snip>
Hi Jeff,
as already mentioned, sub-microsecond accuracy is not a possibility with
NTP these days. Did you check out PTP (IEEE 1588) instead
(ieee1588.nist.gov)?
That is not true. You can get microsecond accuracy or better using a
reference clock. What you can't do is get that kind of accuracy over
the internet.
My only knowledge of PTP is based on some earlier messages here but I
believe that it must have the same problems as NTP over the internet.
<commercial for $1000+ product snipped>
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