Vonage Selects TCS For VoIP E911 Service

Wed Jul 20 16:46:22 UTC 2005

On Wed, 20 Jul 2005, Alex Rubenstein wrote:

>
>
> GPS does not work through the fuselage of a aluminum airplane.
>
> I've tried. More than once.

The gps carrier frequency is 1575.42mhz

a decent gps antenna is unfortunately a bit larger than most small gps 
recivers let alone cellphones. multipath cancelation is a serious issue 
when dealing with gps, and being in a aluminum tube mailer, under tree 
cover or inside commercial construction doesn't help your situation when 
all you have is a tiny patch antenna printed on a pcb.

>
>
> On Wed, 20 Jul 2005 Michael.Dillon at btradianz.com wrote:
>
>> 
>>> If a person is calling 911 from a plane in flight, are
>>> we really so concerned about which PSAP receieves the
>>> call?    The last known fix would likely have been the
>>> point of origin in any case...
>> 
>> If a picocell on board an airplane receives an E911
>> call, it shouldn't route it to any PSAP. The first
>> responders in this situation are the flight attendants
>> so it should ring the flight attendant's phone.
>> 
>> By the way, if GPS works in the air for small aircraft
>> pilots, then why wouldn't it work for cellphones? The
>> last known fix should be 100% up to date and 100% useless.
>> 
>> --Michael Dillon
>> 
>
>

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Joel Jaeggli  	       Unix Consulting 	       joelja at darkwing.uoregon.edu
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