[82511] in North American Network Operators' Group
Re: Vonage Selects TCS For VoIP E911 Service
daemon@ATHENA.MIT.EDU (Joel Jaeggli)
Wed Jul 20 12:52:25 2005
Date: Wed, 20 Jul 2005 09:46:22 -0700 (PDT)
From: Joel Jaeggli <joelja@darkwing.uoregon.edu>
To: Alex Rubenstein <alex@nac.net>
Cc: Michael.Dillon@btradianz.com, nanog@merit.edu
In-Reply-To: <Pine.WNT.4.62.0507201206230.2132@vanadium.hq.nac.net>
Errors-To: owner-nanog@merit.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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