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  1. pkx
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       #1  
    With my Treo 650, I rarely see "EDGE" speeds - I'm lucky to get 40kbps down.

    What are the realistic speeds I could see using UMTS (3G) on the Treo 750? As fast as Verizon's data network perhaps (500-1000k!)?

    I do live in a major metropolitan area..
  2. #2  
    I don't have a 750 (sob), but I did try an HTC TyTN on my local Cingular network a couple of months ago. If the 750 arrives on Cingular with HSPDA support then you will see speeds slightly better than the current Verizon EVDO speeds. I saw usually 700kbit/sec to 900kbit/sec on the TyTN compared to the usual 400kbit/sec to 800kbit/sec on the 700p. If it only has UMTS, then it will probably max out around 350kbit/sec.
    Main Phone: Treo 270/600/650/700w/700p/750v/Motorola Q/iPhone
    Tried but sold: Motorola Q/Nokia E61/700wx/HTC TyTN/Treo 680
  3. #3  
    can i expect these speeds while on a train? Its not a subway, the train is above ground, so I guess my question is if these speeds are sustainable in a moving object through a UMTS/HSDPA blanketed area.
  4. #4  
    When moving fast on a train... my experience is that you can forget about using the service reliably... This on a Vodafone network in Italy, from Torino to Milano. Even when leaving, it's about impossible to use the UMTS service on the train...
    As soon as the train stops, everything goes with no problem...
  5. #5  
    I haven't tested this with UMTS, but I have found data downloads are fine in a car with EVDO. I'd be surprised that it was different with UMTS
    Main Phone: Treo 270/600/650/700w/700p/750v/Motorola Q/iPhone
    Tried but sold: Motorola Q/Nokia E61/700wx/HTC TyTN/Treo 680
  6. #6  
    if this can't be used reliably on a train, I'll switch to sprint.
  7. tirk's Avatar
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    #7  
    Quote Originally Posted by fasuin View Post
    When moving fast on a train... my experience is that you can forget about using the service reliably...
    "I was told" (but haven't been able to verify this so far) that "3G data" (don't know if that's UMTS/HSDPA or what) doesn't hand on from cell to cell properly, like GPRS. Hence the problem on trains, which I have experienced with a 3G data card in a laptop. Any of the telecoms ubergeeks care to enlighten??
  8. #8  
    There is an issue with Doppler shift, caused by movement. The higher the frequencies, and the faster the data transfer rate, the more susceptible transmission is to failing due to movement.

    Surur
  9. #9  
    Quote Originally Posted by bcaslis View Post
    I don't have a 750 (sob), but I did try an HTC TyTN on my local Cingular network a couple of months ago. If the 750 arrives on Cingular with HSPDA support then you will see speeds slightly better than the current Verizon EVDO speeds. I saw usually 700kbit/sec to 900kbit/sec on the TyTN compared to the usual 400kbit/sec to 800kbit/sec on the 700p. If it only has UMTS, then it will probably max out around 350kbit/sec.
    wow, those are some good speeds. It would be awesome to get those in the Chicago area
    Irv Robinson
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    Motorwerks, Barrington, Illinois
    email: irobinson@motorwerks.com
    For More Information, visit: www.edBMW.com <br/>and for latest news www.edBMW.com/blog
  10. #10  
    Quote Originally Posted by fasuin View Post
    When moving fast on a train... my experience is that you can forget about using the service reliably... This on a Vodafone network in Italy, from Torino to Milano. Even when leaving, it's about impossible to use the UMTS service on the train...
    As soon as the train stops, everything goes with no problem...
    Well, sad to hear about that.
    Here in New York City, i usually take the subways and when i'm on the above ground lines or sections (J train - going to Queens, A train, 7 train..and so on) and on my 650 (now on 700P), speeds are fine.
    Believe it or not, before i got the 700P, i used to ride the M4 bus from midtown Manhattan going uptown on Broadway towards Harlem, and tether my 650 to my 12" PowerBook and it was absolutely impressive. Granted the buses drive slower than a speeding train, but imagine being on a bus going about 35 MPH using a cell phone to "very usably" surf the net. I'm a BBC nut and used to mostly stream BBC news while I.M'ing friends at the same time (and other things too).
    Some lad was absolutely dumbfounded as to how i was surfing the net on a moving bus as he couldn't fathom how i was getting the connection nor see any visible wires coming or going from my laptop (i had the 650 in my jacket pocket). Needless to say it was a mostly interrupted ride from curious passengers.

    Could it be that CDMA (1XRTT or EVDO) has a bit of an advantage in this scenario or that your service provider's network in Italy is the bottleneck or specific technical differences between both technologies?
  11. #11  
    Probably the train is too fast (100 MPH + maybe). When driving at say 30 mph I still get normal UMTS transfer, but at 60-70 there is no chance.

    Surur
  12. #12  
    oh well my train usually goes around 30-40 so maybe it'll work.
  13. #13  
    Quote Originally Posted by Merovingian View Post
    Well, sad to hear about that.
    Here in New York City, i usually take the subways and when i'm on the above ground lines or sections (J train - going to Queens, A train, 7 train..and so on) and on my 650 (now on 700P), speeds are fine.
    Believe it or not, before i got the 700P, i used to ride the M4 bus from midtown Manhattan going uptown on Broadway towards Harlem, and tether
    Could it be that CDMA (1XRTT or EVDO) has a bit of an advantage in this scenario or that your service provider's network in Italy is the bottleneck or specific technical differences between both technologies?
    Wel... train in Italy are a bit faster then subway trains :-)
    I last time I was testing UMTS connection on the Torino-Milano railway, the speed of the train was 300Km/h (about 180Miles/h)...
    My guess is that when travelling so fast, handovers and physical problems make it impossible to have a data connection. Note that phone calls also can have some problems...

    When traveling a Bus or subways in the city, there is no problem in getting good connections...

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