Two-way RF communication at points of convergence of wire pairs from separate internal telephone networks

DETAILED DESCRIPTION The invention described in the second CIP application eliminates the need for installation of multiple coaxial cable branches within a residence.
Once a feed from the main cable trunk is brought to a house or apartment unit, the technology described in that application can transmit signals from that feed onto the internal active telephone wiring of the residence, using those wires to carry the signals to the individual televisions.
Thus, only the coaxial cable which leads from the main cable trunk to the residence is necessary.
One general concept that this invention provides is the use of active telephone wiring (i.
e.
, wiring that is also used for its normal purpose to carry telephone signals) as the transmission line leading from a main cable trunk (which is coaxial cable or fiber optics) to the individual subscribers.
This significantly reduces the complexity and expense normally associated with cable TV wiring, above the reduction described in the second CIP application.
A major advantage of this wiring over coaxial cable is that nearly every residence (such as an individual house or an apartment unit in an apartment building) has one or more phone lines, each including at least one twisted pair (e.
g.
, the red-green pair; typically, a second twisted pair of black-yellow wires is also provided) leading to it from the telephone company trunk line.
A second advantage is that signals applied to the telephone line are available at every telephone jack, rather than at a single coaxial outlet.
Thus, a general aspect of this invention is a system that provides video signal communication between a source of the video signal and a plurality of units that include destinations of the video signal and that includes an interface coupled to the source and to telephone lines, each of which serves at least one of the units and carries voice signals to and from one or more telephones coupled to the telephone line at said unit.
The interface receives the video signal from the source, and transmits the received video signal onto at least one of the telephone lines in a selected frequency range that is different from frequencies at which the voice signals are carried on that telephone line