Concentrator system with polling-response means for detecting fa

Details Concentrator system with polling-response means for detecting fa Concentrator system with polling-response means for detecting fa

1989-03-13

1990-05-08

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379333, 455 54, H04J 302

Patent

active

049244574

ABSTRACT:
In a radio concentrator system, a master station and a terminal station cooperate with each other to establish connections between remote subscriber terminals and a public switched network through radio message channels. An intraoffice call is set up between first and second subscriber terminals through the connections established in the terminal and master stations via the network. Upon establishment of such an intraoffice call, the terminal and master stations clear their connections and reestablish local connections in the terminal station between the subscriber terminals. The master station transmits a polling signal at periodic intervals to the terminal stations, which responds to it by transmitting an acknowledgement signal as long as the local call is in progress. The master station detects if the acknowledgement signal is received in response to the polling signal. End-of-call indication is given to the network when the response is not received for a prescribed time interval to stop the tariff charges on the calling party.

REFERENCES:
patent: 3778555 (1973-12-01), Nordling et al.
patent: 3917908 (1975-11-01), Galluccio
patent: 4021618 (1977-05-01), Wurst
patent: 4070551 (1978-01-01), Weir
patent: 4208549 (1980-06-01), Polillo et al.

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