Re: Verizon EVDO Issues

[Alexander Harrowell <a.harrowell () gmail com>]

On Tuesday 07 April 2009 22:10:24 Charles Wyble wrote:
> Been troubleshooting a very strange problem for a couple of weeks now.
>
> I have a few hundred systems deployed throughout the United States
> utilizing EVDO connectivity with Verizon as a carrier. They are stationary.
>
> Over the past few weeks clusters of them in SF and Lewisville TX and a
> few other areas have been failing intermittently. They are offline for
> several days, then online for a few days then go offline again. They are
> running Linux and PPPD.

Do they maintain a continuous data link in normal operation (like, say, 
connectivity for a LAN, or backhaul for a camera or some such), or do they 
request the data link when they need to send [whatever] (like a discrete SCADA 
system)? My (user only) experience is that cellular data service doesn't 
handle long sessions well.

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