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56K Modem
Message
De
11/04/1999 09:06:09
 
 
À
11/04/1999 02:01:14
Vinod Parwani
United Creations L.L.C.
Ad-Dulayl, Jordanie
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Titre:
Divers
Thread ID:
00207237
Message ID:
00207260
Vues:
12
>I'm getting connected at 50,667 bps on my new 56k modem, whereas when I was using 33.6k,connection was at 115200...
>
>Can somebody pls advs. me how to connect it a faster rate...
>

The difference you're seeing is in what's being reported as a connect rate by the modem - the modem is connecting to the other modem wqith an inbound channel (information coming from the other end) at 50K, and an outbound channel somewhere in the 33.6K range (the 56K modems only support inbound traffic above 33.6K, and then only if the connection is to a special server modem; the outbound channel is operating at v.34 rates (33.6K or less). The Inbound channel will also use v.34 if the other end isn't a modem specifically set up as a server modem attached to a digital line, like most ISPs use - a connection to another standard 56K modem or 33.6K modem will use v.34 throughoout.)

You old modem, rather than reporting the speed of the modem-modem connection, was reporting the speed of your comm port-modem connection. The value reported by different modems varies, and essentially, the number reported before was meaningless, and the number reported now is equally meaningless - the value reported is the speed at connect time; the connection is dynamically adjusting the modem-modem connection according to line conditions - your connection can vary considerably as line conditions change, for better or worse.

Under no set of circumstances were you ever connecting standard modems over POTS (Plain Old Telephone System) lines at anything approaching 115Kbps -in the US, the FCC actually limits the maximum throughput of x2/Kflex/v.90 modems to a bit over 52K on the inbound channel.

This is simply a case of looking at a meaningless number (in both cases) and reacting because the number is smaller, and therefoire, looks worse. The real measure is not the reported speed of the conenction, but objective measurement - connect using the two different modems and download an identical file; if the connection is direct, or if Internet conditions are similar using an Internet connection, you can get a more meaningful number - throughput - rather than reported connect speed.

>TIA
EMail: EdR@edrauh.com
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