Re: Vonage Selects TCS For VoIP E911 Service

[Joel Jaeggli <joelja () darkwing uoregon edu>]

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 () 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 () darkwing uoregon edu
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