Multiplex communications – Wide area network – Packet switching
Patent
1985-11-27
1987-12-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 93, H04J 324, H04J 326
Patent
active
047138084
ABSTRACT:
A wide area paging system is disclosed in which paging messages input to the system in one local area can be broadcast to a receiver in any other local area without necessarily broadcasting the message in all areas. A local area clearinghouse in each area stores resident subscriber data including current location and receiver serial number. This data is used to transfer messages over a data network to the correct clearinghouse. The system uses a TDM data protocol. The data is encoded and transmitted at a very high rate (e.g., 19,000 baud) in short packets (256 bits/13 milliseconds) via stereo FM sidebands. Receivers are assigned to receive sequentially numbered time slots matching a portion of their address. The addresses of intended receivers are included in the data packets. Battery-powered receivers are deactivated between packets and reactivated in accordance with the sequential time slot number scheme to receive an incoming packet. Messages longer than a packet are segmented and transmitted in two or more packets, linked together by data contained in the packets. A watch pager used in the system employs a wristband antenna which electromagnetically couples to the user's body. The watch pager displays time, telephone numbers and icons representing common types of paging messages.
REFERENCES:
patent: 3532985 (1970-10-01), Glomb et al.
patent: 3628147 (1971-12-01), Makimo
patent: 3836726 (1974-09-01), Wells et al.
patent: 3937004 (1976-02-01), Natori et al.
patent: 4131855 (1978-12-01), Hamagawa
patent: 4315332 (1982-02-01), Sakami et al.
patent: 4317220 (1982-02-01), Martin
patent: 4337463 (1982-06-01), Vangen
patent: 4358836 (1982-11-01), Tohyama et al.
patent: 4369443 (1983-01-01), Giallanza et al.
patent: 4383257 (1983-05-01), Giallanza et al.
patent: 4398192 (1983-08-01), Moore et al.
patent: 4419765 (1983-12-01), Wycoff et al.
patent: 4437095 (1984-03-01), Akahori et al.
patent: 4518961 (1985-05-01), Davis et al.
patent: 4519068 (1985-05-01), Krebs et al.
patent: 4569598 (1986-02-01), Jacobs
patent: 4641304 (1987-02-01), Raychaudhuri
Barnum Lewis W.
Gaskill Garold B.
Hoff Don G.
Park Daniel J.
Rose Donald T.
A T & E Corporation
Marcelo Melvin
Olms Douglas W.
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