My own experience with the ATT/Cingular network on an aircard is over 1MB download, and latency on ping responses in the 80-100 msec range, pretty darn good for a wireless network.
Dave P/Memphis (and a network professional)
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EVDO technology and what to be aware of
EVDO technologies in general are very unorthodox. They go to disconnected state in 20 seconds and used a stacking and queuing technology that adds additional latency. You can do network speed tests and get impressive numbers, however there are latencies that are often not accounted for. When creating sophisticated applications that use these networks beware. You will see latency in your application(s) and the carriers will never tell you why when you delve into figuring out the mystery of poor performance. Most think these networks are for browsing and email which queues messages by default. Other things that occur is network switching. If a network is busy the priority is for VIOP, you may do a data connection and see that the EVDO connection is dropped down to CDMA (dial up speeds). Most people are really impressed by EVDO. However, these people are also easily impressed by first impression using it in one location with good signal. With signal degradation or an area that has a lot of usage the performance numbers dive fast!
The bottom line is that an extremely thorough evaluation should be performed before investing in using these technologies.
This sounds like spin by a
This sounds like spin by a non CDMA proponent to me. The fact is that on any given tower there is an allocation for voice and data not voice, data, and voip. Voip looks and feels like data as it is voice encapsulated in an IP data packet and is not differentiated by the contents of the packet by the radio tower. The radio can go to a standby state after a period of inactivity which is a reasonable expectation given the limited nature of frequency allocation and could potentially have an impact with some poorly implemented applications. A savvy network engineer can mitigate these issues. You can be sure that other standard over the air radio allocations will have the same issues.