nanog mailing list archives
Re: Vonage Selects TCS For VoIP E911 Service
From: Andre Oppermann <nanog-list () nrg4u com>
Date: Wed, 20 Jul 2005 15:02:38 +0200
Michael.Dillon () btradianz com wrote:
In the US, that might be true, but, I'm betting that could be very wrong in places like London. I'm betting the station where you boarded the Tube could be a LONG way from where you make the 911 call.There are very few places in the underground tube system where you can make calls on your mobile. Outside central London where the tuberuns aboveground I would expect that GPS reception would be available wherever mobile reception is available, after all the tube trainshave lots of windows.
This is unlikely. GPS reception is usually determined by sight of horizon. For example the navigation system in my car has trouble from time to time spotting enough GPS satellites when I'm driving in the inner city of Zurich. It keeps itself updated by compass and tracking the movements/velocity of the car. If a car mounted GPS has trouble keeping up with GPS in a city I highly doubt that a small mobile phone without any line of sight at all would be able to get any meaningful GPS signal reception. The low number of active GPS satellites and their concentration over the middle east don't help getting accuracy and reception higher up in US and EU. The new EU system called Galileo has a larger number of satellites planned which makes chances higher to have a number of the in sight all the time. On top of that it is 20 years further in technology refinement than GPS. OTO it ain't there yet and any speculation on how good it will be is moot until we can see ourselfs. -- Andre
Current thread:
- Re: Vonage Selects TCS For VoIP E911 Service, (continued)
- Re: Vonage Selects TCS For VoIP E911 Service Daniel Senie (Jul 19)
- Re: Vonage Selects TCS For VoIP E911 Service Mikael Abrahamsson (Jul 19)
- Re: Vonage Selects TCS For VoIP E911 Service Brad Knowles (Jul 19)
- Re: Vonage Selects TCS For VoIP E911 Service Alex Rubenstein (Jul 19)
- Re: Vonage Selects TCS For VoIP E911 Service Michael . Dillon (Jul 20)
- Re: Vonage Selects TCS For VoIP E911 Service Andre Oppermann (Jul 20)
- Re: Vonage Selects TCS For VoIP E911 Service Mikael Abrahamsson (Jul 20)
- Re: Vonage Selects TCS For VoIP E911 Service Andre Oppermann (Jul 20)
- Re: Vonage Selects TCS For VoIP E911 Service Owen DeLong (Jul 20)
- Re: Vonage Selects TCS For VoIP E911 Service Michael . Dillon (Jul 20)
- Re: Vonage Selects TCS For VoIP E911 Service Andre Oppermann (Jul 20)
- Re: Vonage Selects TCS For VoIP E911 Service Mikael Abrahamsson (Jul 20)
- Re: Vonage Selects TCS For VoIP E911 Service Owen DeLong (Jul 20)
- RE: Vonage Selects TCS For VoIP E911 Service Shane Owens (Jul 20)
- RE: Vonage Selects TCS For VoIP E911 Service Owen DeLong (Jul 20)
- Re: Vonage Selects TCS For VoIP E911 Service Alex Rubenstein (Jul 19)
- Re: You're all over thinking this (was: Re: Vonage Selects TCS For VoIP E911 Service) Brad Knowles (Jul 20)
- Re: You're all over thinking this (was: Re: Vonage Selects TCS For VoIP E911 Service) Peter Corlett (Jul 21)
- Re: You're all over thinking this (was: Re: Vonage Selects TCS For VoIP E911 Service) Richard Cox (Jul 21)