Two-to-four wire conversion process? (Analogue Telephony?)?

Question

Just what the h**l is the the basic principle of the Two-to-four wire conversion process? I am tryign to research this all across the internet, and I don't get a straight answer anyway.

Answer 1

In principle you need one pair of wire (2 wires) for transmission of signal( your speech say) in one direction and another pair of wire in the opposite direction for what your girl friend has to say from that direction. . That is you need four wires to have an effective conversation. This is referred to as full DUPLEX mode. But laying four wires for each subscriber is very expensive. This is overcome by using what is called  a hybrid , a four wire to two wire converter. The hybrid provides sufficient isolation between trans and receive circuit.

The principle of operation of the hybrid requires a big explanation and is available in most of the books on basic telecommunication. One site reference is provided which covers some explanation on this subject (go to page 15).

Answer 2

I really don't understand your question,But ckts are converted from 2 to 4 wire so xmision and reception can be independently adjusted and same time full duplex operation. is possible(ie  in radio the signal is transmitted on separate channels or there is interference so all radio xmissions are simplex(1 per channel) this is done by taking the 2 wires of a ckt and center taping two coils feeding the output of the 2 coils to 2 independent channels broadcasting and receiving on the independent channels then reversing the process at the other end)

Answer 3

The component which converts from two to four wire, and vice versa, is a hybrid transformer.