[time-nuts] GPS Outage..

[Magnus Danielson]

Hi Jim,

On 02/27/2016 06:14 PM, jimlux wrote:
> On 2/26/16 11:34 PM, Hal Murray wrote:
>>>> How many of them came from E-911 stations?
>>> E-911 triangulation done on cell towers …
>>
>> I was thinking of the stations where they have the dispatchers who
>> answer the
>> calls
>> and pass the info on to the right people.  I think they need good
>> timing on
>> the recordings, but don't know any details.  I've always thought some
>> of them
>> used GPS.
>>
>
>
> They need good time, but probably only to the nearest second.

Phase alignment is relevant for TDMA based systems as well as CDMA based 
systems, but for a bit different reasons.

GSM for instance actually have phase requirements, but dodges it by 
using one of many options to compensate the phase difference between 
different towers.

Cheers,
Magnus