Speech and data communication network

Details Speech and data communication network Speech and data communication network

1981-03-10

1983-08-30

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370 11, 370 85, 370 92, 375 22, H04J 302, H04J 600, H04J 900

Patent

active

044020732

ABSTRACT:
The network comprises a two-wire bus (coaxial cable) and a source of synchronizing pulses connected to the bus for marking off TDM cycles of about 125 us duration comprising a control slot and 8 links, i.e. pairs of time slots. The bus links devices, each comprising a microprocessor, TDM interface, bus interface and audio circuits. To set up a call the calling microprocessor finds a non-busy link and addresses in the control slot the called device which acknowledges. The TDM interface of the called device transmits pulses in one slot of the selected link while the TDM interface of the calling device transmits pulses in the other slot of the selected link. The bus interface effects pulse width modulation and demodulation of the pulses for full duplex speech transmission. The microprocessor also sends and receives digital data by the omission of pulses representing 0 bits. The data is formatted in 8-bit bytes framed by single 0 start and stop bits separated by guard bits, so that the longest possible interruption to speech transmission is 10 TDM cycles, i.e. about lms. This is short enough to allow simultaneous transmission of speech of reasonable quality and low rate digital data (e.g. from a keypad).

REFERENCES:
patent: 2753398 (1956-07-01), Pinet
patent: 3178515 (1965-04-01), Bramer et al.
patent: 3916108 (1975-10-01), Schwartz
patent: 4210780 (1980-07-01), Hopkins et al.

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