Modem tones over television or radio

OK, poor wording on my part... The idea of transmitting modem tones over the radio (yes, even the broadcast bands) is nothing new. Back in the 1930s the U.S. Navy was playing around with the idea, trying to work it into their communications systems, but did not have a great amount of success until 1944 or so. By then the system had evolved into quite a monster, with quite a bit of it being automated. "Routing" as we know it was still manually done and messages were generally not broken into "packets". One very interesting aspect is that the radioteletype nets were integrated with the landline nets using things called "Land Line Control Units". These allowed an operator to use a distant radio site to contact a station not on the landline (i.e., a ship) in a completely automated fashion - the radio sites could be left unmanned if need be. My point is that transmitting digital data over the land or air is really a very old idea - most of what we know as networking theory these days was formulated by the government and telephone companies long ago. William Donzelli william(a)ans.net