ProAsm... I see that you have been dusting off an old copy of "Electronic
Communications Systems" by G. Kennedy again (published in the late
sixties)
I can't help but notice how the definition has continued to change over time
and today has little bearing on what was once considered as cast in concrete!
Most recent publications seem to have adopted the following:
"The term Broadband has a number of meanings. It was coined originally
to describe a channel with more bandwidth than a standard voice-grade
channel, and is usually a 48Khz link, equivalent to 12 voice-grade channels.
These voice grade-channels have been superseded by digital circuits.
Broadband is also one of the two prevalent ways of conveying information
round a LAN – the other, simpler one, being baseband, Baseband puts the
digital signals straight onto the cable from the data communications device
without any form of modulation, whereas broadband needs modems.
Baseband can only carry one data signal at once, but broadband has multiple
frequency channels, operating independently of each other, that can carry
voice, data & video. This is usually achieved by frequency division multiplexing
(FDM), which modulates each channel to a particular frequency level in the
cable".
Today if you mention Broadband and we are not talking about internet
or network access throughput.... you tend to get strange looks
Communications Systems" by G. Kennedy again (published in the late
sixties)
I can't help but notice how the definition has continued to change over time
and today has little bearing on what was once considered as cast in concrete!
Most recent publications seem to have adopted the following:
"The term Broadband has a number of meanings. It was coined originally
to describe a channel with more bandwidth than a standard voice-grade
channel, and is usually a 48Khz link, equivalent to 12 voice-grade channels.
These voice grade-channels have been superseded by digital circuits.
Broadband is also one of the two prevalent ways of conveying information
round a LAN – the other, simpler one, being baseband, Baseband puts the
digital signals straight onto the cable from the data communications device
without any form of modulation, whereas broadband needs modems.
Baseband can only carry one data signal at once, but broadband has multiple
frequency channels, operating independently of each other, that can carry
voice, data & video. This is usually achieved by frequency division multiplexing
(FDM), which modulates each channel to a particular frequency level in the
cable".
Today if you mention Broadband and we are not talking about internet
or network access throughput.... you tend to get strange looks
(Here we go again.....)