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Wi-Fi VoIP At 80 mph

Posted by timothy on from the 130-km/h-in-mexico dept.

fredo123 writes "Almost faster than a speeding bullet. As reported in Muniwireless minutes ago, RoamAD and WI-VOD have tested mobile VOIP over Wi-Fi at over 130 Km/h over an 8km stretch of Interstate highway somewhere near the Mexican border. Gee... I wonder what this is for?" No need to guess: according to the MuniWireless link, "the network is for public safety personnel (police, fire, ambulance and border patrol) first, with various community agencies, schools, business and local residents being added as the deployment expands beyond its targeted coverage areas."

4 of 142 comments (clear)

  1. Public safety? by Anonymous Coward · · Score: 5, Interesting

    How safe is using WiFi for such critical communication? Any kid with the right hardware can interfere with the WiFi signal. Not only that, but WiFi network congestion already creates problems for some people.

    I don't know what the rage over VoIP is -- the telephone system has worked for many, many years. We're just opening ourselves up for another avenue of attack. Can anyone say terrorists with WiFi blockers?

  2. Re:How Fast? by k4_pacific · · Score: 5, Funny

    Fast enough that you'd be out of range of the access point before you could find out if it worked or not.

    Officer: Are you aware that you were going 0.90c in a 55 mph zone?

    Driver: Ummm... I was?

    Officer: Didn't you notice the blue shift son?

    --
    Unknown host pong.
  3. Good News for Motorists by ackthpt · · Score: 5, Funny
    When the guy in the Luxus blasted past me at about 100 mph while blathering away on his cell call "hey fred, you should see how this thing handles on the shoulder of the road at 100 mph while one handed driving, marvelous..." he knew he could count on that keeping up with him. granted he was going substantially slower than the c (the speed of light).

    Now he's assured that he could steer with his knees and type away on his laptop while driving similarly "hey fred, how to you spell 'psychopath'?"

    --

    A feeling of having made the same mistake before: Deja Foobar
  4. Re:How Fast? by DustMagnet · · Score: 5, Informative
    Light moves a lot faster than sound, so the amount of frequency shift is very small. A 2.4 GHz carrier would be shifted to 2.40000029 at 80 MPH.

    The frequencies of radios aren't very exact, so the tuners are designed to deal with some variation. Without knowing exactly how the tuners are designed (especially the filters), I can't answer your question, except to say, a whole lot faster than 80 MPH.

    --
    'SBEMAIL!' is better than a goat!!