Re: GPS Data Bandwidth Usage

On Mon, 20 Aug 2007 09:36:22 -0700, brentevans@xxxxxxx wrote:

I was hoping one of you extremely bright gentlemen or ladies could
assist me.

We are running a fleet of approximately 400 vehicles equipped with GPS
receivers. These vehicles are transmitting data (not GPS yet) across
a Motorola Datatec 900 MHz network. These systems would be setup to
transmit every 5 min. Can anyone explain the Bandwidth implications
of adding this traffic to our network?

Thanks for the help, Brent


Are you using a "DATATAC" network?

Are you a cop? Or a taxi company?

How many of the 400 are actually active at one time - your busiest
time - all of them?

Depending on the load on your network at your current usage level, you
could either bring the system to its knees or hardly notice the
additional load.

What is the number of milliseconds to transmit/receive/process a
single position report?

No matter what the studies that your Motorola rep or your own people
have already done show you, I would start conservative, and set the
system up initially to report less often, then decrease the reporting
period delay in steps till you notice it.

What is the implication of initially knowing anyone's location say
every 10 or 15 minutes instead of every 5 minutes?

Is it easy to change the reporting period without servicing the in
vehicle units?

Do you have the option of specifying a "polled report" mode, where
each vehicle's position is requested from a centralized server, then
it reports?

.

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