This is accomplished through a hybrid coil ( A3 ).
2.
:: We have a splitter article, from which it's pretty obvious the thing is a hybrid coil.
3.
A bridge tap has no hybrid coil or other impedance matching components, just a T ( or branch ) in the cable.
4.
The strong outgoing speech signal from the microphone ( transmitter ) does not overpower the weaker incoming speaker ( receiver ) signal with sidetone because a hybrid coil ( A3 ) and other components compensate the imbalance.
5.
Land-line telephone networks are full-duplex, since they allow both callers to speak and be heard at the same time, with the transition from four to two wires being achieved by a hybrid coil in a telephone hybrid.
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