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Tuesday, 21.05.02
KNOWLEDGE: Latency or how fast is your packet sent
Posted by Arne Hess - at 18:32 CET under 09 - Thoughts

While the whole wireless industry and the consumers are talking about bandwidth in wireless networks (GSM is able to provide up to 14.4 KBps, GPRS in theory 171.000 KBps and 3G in theory 2 MBps) one not less important fact is forgotten - the round trip delay or better known as latency. defines latency as follow:

In a network, latency, a synonym for delay, is an expression of how much time it takes for a packet of data to get from one designated point to another. In some usages (for example, AT&T), latency is measured by sending a packet that is returned to the sender and the round-trip time is considered the latency.
The latency assumption seems to be that data should be transmitted instantly between one point and another (that is, with no delay at all). The contributors to network latency include:

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Sunday, 19.05.02
TEST: How much bandwidth consumes MSN Messenger through GPRS?
Posted by Arne Hess - at 18:48 CET under 09 - Thoughts

Always on - always nice - always expensive? How much traffic generates the MSN Messenger on the Pocket PC via GPRS?
I've tested it today and connected my Pocket PC with my GPRS network. For the Messenger account I've used an test-account which I have but isn't included in any buddy-lists. So I prevented to get any status messages of logged-in buddies but just the plain MSN Messenger Service connectivity.

For the traffic monitor I've used PDAwin's Network Monitor which gave me a good overview of the up- and downloads and here are the results:

MSN Messenger through GPRS needs near no bandwidth. Messenger only send and received a kind of Ping every 3 to 5 minutes:

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Friday, 10.05.02
SERVICE: The Star Alliance Worldwide Timetable is more than a pure flight schedule only
Posted by Arne Hess - at 12:57 CET under 09 - Thoughts

While we are talking about Internet access on airplanes we have to first book a flight. My fellow MVP Chris Forsberg pointed me to this very interesting Star Alliance timetable application for Pocket PCs.

The Star Alliance PocketFly Timetable offers the convenience of the Star Alliance member airline schedules on your PDA using the Pocket PC Operating System 2000 and 2002 with the StrongArm Processor.

Features include:

  • Look up flights by Date
  • Global flight schedules
  • Dynamic connection building
  • Advanced lookup options
  • Add selected flights to your Calendar Build your Travel Itinerary and ActiveSync to Outlook.

Have you seen the latest bullet point? This application allows you to copy the selected flight directly to your Pocket Outlook Calendar, that's fancy! Here how it works:

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Friday, 03.05.02
THOUGHT: Where is the reason/value for
Posted by Arne Hess - at 21:46 CET under 09 - Thoughts

Hm... Cause I have a new - functional - Casio E-200 now, I've took the opportunity to check out and I didn't found any value there? Is it just my impression or is it - at least today - useless? Downloading commercial movies doesn't makes sense for me and also the MP3 offer is not what I'm looking for.

On the Mobile Info I got a browser/cookie error and I don't see any value

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