Modem sharing device

Details Modem sharing device Modem sharing device

1976-09-13

1977-08-02

Stellar, George G.

Communications: electrical

Digital comparator systems

364900, H04B 138

Patent

active

040400140

ABSTRACT:
An electronic module including a logical interlock for interconnecting two data sources to a modem whereby only one of the two data sources is allowed to transmit data at a time. First and second flip-flops and logic gates controlled thereby are provided such that the first data source to present a Request-to-Send (RTS) signal is awarded priority and thereby selected to receive a Clear-to-Send (CTS) signal from the modem. A subsequent RTS signal from the non-selected data source is ineffective in establishing communication with such non-selected data source since that source is blocked from receiving a CTS signal from the modem. A clock signal is effectively employed to ensure that simultaneously-generated RTS signals from the two data sources are only responded to by one of the two data sources.

REFERENCES:
patent: 3609693 (1971-09-01), Ferroglio
patent: 3772656 (1973-11-01), Serracchioli et al.

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