H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/11, 379/5, 3
H04M 11/06 (2006.01) H04L 5/06 (2006.01) H04L 27/12 (2006.01)
Patent
CA 1149529
AUDIO AND DIGITAL DATA TRANSMISSION SYSTEMS Abstract of the Disclosure Transmission systems providing for simultaneous conventional baseband telephone signaling and digital data transmission on nonloaded telephone wires are disclosed. The systems include a modem located near each telephone. The modems are connected to the telephone and to digital data terminals. Each modem includes a data transmitter that converts digital data to be transmitted from binary form into F1/F2 FSK form and a receiver that converts received digital data from F3/F4 FSK form into binary form. In one type of transmission system, digital data communication between a pair of subscribers (A and B) is provided. In another type of transmission system digital data communication between a plurality of telephone stations and a data processing center is provided. In systems for communicating between a pair of subscribers a repeater located at a central office bidirectionally converts the F1/F2 FSK signals produced by one subscriber (A or B) into F3/F4 FSK signals forreceipt by the other subscriber (B or A). In systems of communicating between a plurality of stations and the data processing center, a subsystem located as a CO or PABX converts F1/F2 FSK signals into binary digital data, multiplexes the binary digital data from a plurality of stations and forwards the binary digitaldata to the data processing center. The subsystem also receives multiplex binarydigital data from the data processing center demultiplexes the binary digital data, converts the demultiplex digital data into F3/F4 FSK signals and forwards the F3/F4 FSK signals to the appropriate telephone station. All the various subsystems include voice frequency filters positioned so as to prevent FSK signals from reaching telephones and line switching equipment and for preventinghigh frequency noise signals generated by the telephones, CO or PABX from reaching the nonloaded telephone wires.
338517
Foulkes John D.
Trombly John E.
Worthington David K.
Smart & Biggar
Teltone Corporation
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