Patent
1977-06-27
1979-12-11
Stellar, George G.
179 16D, 179 23, H04M 100, H04M 300
Patent
active
041784847
ABSTRACT:
A telephone system is described that includes a long line from a central office to a substation with amplifiers. At the substation a transformer hybrid is used to obtain isolation as well as a high trans-hybrid loss. A precision network balances the hybrid and terminates the long line. Regular telephone receiver and transmitter are used. Amplifiers are operational amplifiers that receive power from the long line. Various means of extending long lines are described using this substation, such as using earth ground.
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