> > Are you claiming that it's impossible to have a modem where there are
> > 9600 transitions/second on the 'line' side? Because if so, I don't
> > believe you.
> I'm claiming that it's not possible to have a 9600 baud modem on a POTS
> line. Obviously it is possible on other transmission lines or media with
> greater bandwidth.
Hmm, now we run again in definition problems. POTS is about
analouge transmition, but the media isn't as clear as you might
think. Depending on the kind of connection, and the used the
bandwidth may reach up beyond 30 kHz, alowing rates of more than
100 Kbps transmission - remember, POTS starts as direct coupled
line until the PBX, now ifthis is a _real_ old PBX and the partner
is on the same PBX there are only the amplifiers to reduce bandwide.
If it is a _real_ old (pre 1938) long distance line again the bandwide
is only limited by the bandwidth of the amplifiers (since the cables
are normaly usable beyond them - exeptions may occure, but thats a
different storie, which I had to learn the hard way). Only if there
are filters inbetween, which are only necersary if the signal is
going to be multiplexed for high capacity long distance lines (and
radio connections) the Bandwidth is reduced.
But in fact, this is all history, POTS no longer exists over here
since years.
Gruss
H.
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HRK
Received on Thu Apr 01 1999 - 06:49:40 BST