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Re: Vonage Selects TCS For VoIP E911 Service

  • From: Joel Jaeggli
  • Date: Wed Jul 20 12:53:30 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 [email protected] 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

Joel Jaeggli  	       Unix Consulting 	       [email protected]
GPG Key Fingerprint:     5C6E 0104 BAF0 40B0 5BD3 C38B F000 35AB B67F 56B2