RE: FN-FORUM Modem oddity

date posted 8th January 2001 17:12

I have a feeling that with *some* modem/driver + Windows combinations DUN
reports the bits/s including compression. I.e. if you are transmitting at
100b/s but are getting a 2/1 compression ratio you might get a reported
speed of 200b/s. This *might* explain it.

Alex.


> -----Original Message-----
> From: [EMAIL REMOVED]
> [EMAIL REMOVED] Behalf Of Alison M Wheeler
> Sent: 08 January 2001 16:41
> To: [EMAIL REMOVED]
> Subject: RE: FN-FORUM Modem oddity
>
>
> Thanks David, and I would have to say that had I not seen and tested it I
> would have said the same myself.
>
> Further testing though has now shown it is related to the telco in use...
> on BT line it gives the (expected) 28800 or less
> on Cable London/Telewest it continues to give the high figure. I'm
> wondering whether it is a protocol thing on Telewest's end using something
> in the Hayes' encoding.
>
> oh well. The person who busted the 'proper' card has said they'll buy a
> replacement, so I should be able to give up worrying about it soon anyhow!
>
> Rgds
>
> Alison
> -----Original Message-----
> From: [EMAIL REMOVED]
> [EMAIL REMOVED] Behalf Of David Nye
> Sent: 08 January 2001 11:00
> To: [EMAIL REMOVED]
> Subject: RE: FN-FORUM Modem oddity
>
>
> A 28800 bps modem cannot shift bits to another modem faster than
> 28800 - you
> must be seeing the speed your o/s is using to talk to the modem
> card - which
> is what Windows tends to show by default if the driver does not tell it
> otherwise.
>
> If it seems faster than the newer card, then this only suggests you were
> never actually getting throughput of 44800 bps, but presumably something
> less than 28800. Maybe the hardware compression works better on the old
> card?
>
> David Nye
> http://dnye.com
> Business Systems, Database & Internet Applications Design & Development.
> Microsoft SQL Server, Access, ASP & VB Programming.
>
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