[ntp:questions] UK report on GPS vulnerabilities seems to overlook NTP
.. at ..
Wed Mar 9 01:11:54 UTC 2011
"Chris Albertson" <albertson.chris at gmail.com> wrote in message
news:AANLkTimwu-EZZXv9pp-GBg9MfT1yLhSf9EDrDzLKjnD0 at mail.gmail.com...
> I can't defend the design of CDMA cell technology. But I'm sure a lot
> of it was driven by trying to get as many calls as possible into a
> limited bandwidth. Another requirement for precision timing comes
> from the need to measure the signal's speed of light delay. They use
> this to locate a phone by noting the differences in the delay to
> several towers A uS is about 1000 feet so they need to do this far
> better than to a uS.
There are lots of other systems that will break as well that people didn't
Clustered microwave links
Clustered WiMAX and point to multi point data access points
P.25 (I think depending on the configuration)
Motorola SmartZone & SmartNET (Depending on configuration)
Digital Quazi/Simulcast radio networks (Mototurbo)
Some of those platforms accept any valid clocking source but most depend in
there default setup on GPS.
So far as time of day goes - The people's systems I deal with have S0 GPS
and MSF or DCF77 inputs to there S1 devices so that will be fine - Alas we
don't have any proper caesium clock sources.
More information about the questions