Jim Meagher <[log in to unmask]> wrote:
> Diane,
>
> 28.8 is the maximum actual speed that any analog modem
> can achieve.  The higher "throughputs" (33.6 and 56K) are
> actually accomplished through data compression techniques.

The V.90 standard depends on the fact that the ISP end (the modem you are
dialing) has a pure digital connection to the phone line. The elimination of one
analog to digital conversion makes true 56K (uncompressed) possible (note that
due to FCC regulations, the actual speed is 53K max in the US). On a V.90 modem,
upload speeds are 28.8K max because you (the user) do not have a digital
connection to the telco.


--
Russ Poffenberger               Engineering Specialist
Schlumberger Technologies ATE   DOMAIN: [log in to unmask]
150 Baytech Drive
San Jose, Ca. 95134             Voice: (408)586-6718  FAX: (408)586-4675

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