this also can happen by using "software"modems...we always use hard ware 
based modems...just a guess
----- Original Message ----- 
From: "David Gillett" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, January 01, 2007 5:36 PM
Subject: Re: [PCBUILD] internal 56k modem


> On 31 Dec 2006 at 22:07, Sue Rose wrote:
>
>> Why this disparity--same phone line that i plugged into each tower
>
>  There have been a couple of different 56K standards put forward, not all
> entirely compatible.  Within each standard, there have been chipsets
> available from multiple manufacturers -- and many (but not ALL!) modern
> internal modems implement key features in the driver software, rather than
> in the hardware.  And of course there various configuration options.
>
>  We have no way of knowing that the hardware is in working condition, that
> the correct drivers are installed, that the device configurations are
> identical across these machines....
>
>  My guess would be that the 28800 one is due to limited speed configured 
> on
> the virtual COM port, and that the one that never connects may be damaged 
> or
> have an incorrect or corrupted driver installed, but those are just 
> guesses.
>
> David Gillett
>
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         PCBUILD maintains hundreds of useful files for download
                     visit our download web page at:
                  http://freepctech.com/downloads.shtml