Multiplex communications – Wide area network – Packet switching
Patent
1991-05-24
1993-06-29
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34082508, H04L 1200
Patent
active
052240975
ABSTRACT:
A data communication system which can eliminate the need for repeating equipment therein system, and allowing coexistence of an analog line and a digital line. The system also prevents generating any delays in the transfer of information. The system utilizes slave stations provided between the analog line and digital line of the data communication system, which have a modem circuit connected to the analog line for demodulating the signal sent from the master station and modulating the signal to the lower level slave station and the signal to the master station from that particular station. A control means connected to the modem circuit is provided for extracting a slave station discrimination number or transmission address from the polling signal sent from the master station received through the modem circuit, determining whether the extracted discrimination number is the discrimination number of a lower level slave station outputting a carrier control signal for sending the carrier signal to the line in order to send an analog signal to the line for the modem circuit in accordance with the result of the determination.
REFERENCES:
patent: 4100533 (1978-07-01), Napolitano et al.
patent: 4727541 (1988-02-01), Mori et al.
Fujitsu Limited
Marcelo Melvin
Olms Douglas W.
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