[time-nuts] Handy iPhone app

Oz-in-DFW lists at ozindfw.net
Thu Jul 15 12:20:12 EDT 2010

On 7/15/2010 9:40 AM, Mark Gulbrandsen wrote:
> ... There is no way AT&T would be 12.4 seconds off ...
I used to work in the cell infra business.  While it's less true today,
there are still a number of operators that do not sync system clocks. 
The time supplied to users can be **minutes** off.

Most newer operational standards can't tolerate this and "accurate" time
(better than a ms) is important.  WiMAX requires TDD base stations to
base station alignment to be better than 1 microsecond.  Most telecom
operators want to avoid GPS at every site. It's a logistical PITA.

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