Multiplex communications – Wide area network – Packet switching
Patent
1990-03-14
1992-04-07
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 952, 379 61, H04M 172, H04Q 704
Patent
active
051034484
ABSTRACT:
A telecommunications sytem comprises a plurality of distributed base stations each operatively coupled to a public switched telecommunications network and being adapted to cooperate with one or more of a plurality of portable cordless telephone units by way of a plurality of cordless digital communication channels operating on a time division duplex basis. The base unit is arranged upon detection of an incoming public switched network call, to poll all the portable cordless telephone units by transmitting on a repetitious basis the identity of the portable units to be connected to the incoming call on a selected channel and the base unit is arranged to intersperse each poll operation with a signalling message. Each portable unit is arranged to scan the cordless channels at a predetermined interval and the base unit is adapted to postpone the sending of a ringing message to any of the portable units until a predetermined period has elapsed since the commencement of the polling action, the predetermined period being substantially similar to but larger than the predetermined interval.
REFERENCES:
patent: 4802200 (1989-01-01), Murata et al.
patent: 4817089 (1989-03-01), Paneth et al.
patent: 4875231 (1989-10-01), Hara et al.
patent: 4940974 (1990-07-01), Sojka
patent: 4962524 (1990-10-01), Murata et al.
patent: 4991198 (1991-02-01), Tate et al.
Barnes Nigel E.
Knight Philip J.
GEC Plessey Telecommunications Ltd.
Hsu Alpus H.
Olms Douglas W.
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