BD>-> JK> I'm looking at ordering a SupraFAX modem for my BBS, but now
BD>-> JK> 56K deal is coming along, should I wait on buying this modem?
BD>->
BD>-> No.  The 56k stuff requires some sort of fancy hardware on the ISP's
BD>-> side to  work properly..
BD>JK> I believe it just said the ISP needed a direct, digital connect,
BD>JK> while the end user just needs a phone line (POTS).
BD> It is a bit fuzzy with all the bits and pieces floating through!
BD>JK> Back in the days of the 2400 bps modem, naysayers said a 9600 bps
BD>JK> modem was "impossible", yet it happened, then 14,400 [etc]..
BD> Naysayers should be taken for what they are, and nothing more.  
BD> There's a big difference between bps and band width.  I believe what
BD> knowledgeable technicians said was, the band width of current phone
BD> lines was then limited to 2400 baud (by the technical definition of
BD> band width signals).  That's the size of the playing field, not what
BD> players can do on it!
BD> Confusion arose later when those who chose to equate their product
BD> to baud rates arrived at the barrier for a single signal.  People do
BD> not always conform to a technical definition.  Ad writers and sales
BD> promoters, in fact, are prone to stretch things beyond truth with
BD> little regard for accuracy.  Only by their misnomer is modem baud
BD> rate equivalent to band width.  It isn't, so don't be misled.
BD> The manner in which speeds were effectively increased was to utilize
BD> multiple 2400 baud signals rather than one signal, which had been an
BD> accepted practice, up to that time.  Phone lines can carry numerous
BD> signals simultaneously on voice without interfering with each other.
BD> That was adapted to use in splitting modem signals and descrambling
BD> them on reception, adding the data, to comprise greater volume as if
BD> it were sent at a higher rate, which was in fact still at 2400 baud,
BD> by signal width.  That's all the phone company requires, so that's
BD> all we get on common voice lines.
Sorry for quoting so much, but this is the first explanation I have seen
as to how modem mfgs are able to keep squeezing all of that baud into
such little bandwith.   So what you are saying is that my 14.4 modem
uses multiple 2400 baud "signals" to acheive a baud rate of 14,400??
So like the data is split up between many different signals and
re-assembled at the other end and vice versa?
-=SK=-
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