H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/17, 325/31,
H04J 3/06 (2006.01) G04G 21/04 (2010.01) G08B 3/10 (2006.01) G08B 5/22 (2006.01) H04L 1/18 (2006.01)
Patent
CA 1260636
WATCH PAGER SYSTEM AND COMMUNICATION PROTOCOL ABSTRACT OF THE DISCLOSURE A wide area paging system can broadcast paging messages input in one local area to a receiver in any other local area. A local area clearinghouse 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 clearing- house. The data is encoded and transmitted in 256 bit/13 millisecond TDM data packets via stereo FM side- bands. Receivers are assigned sequentially numbered time slots matching part of their address. The addresses of intended receivers are included in the data packets. Battery-powered receivers turn on and off just in time to receive an incoming packet in their assigned slot. Long messages are transmitted in two or more linked packets. A watch pager employs a wristband antenna which electromagnetically couples to the user's body and displays time, telephone numbers and icons representing common types of paging messages.
496959
Barnum Lewis W.
Gaskill Garold B.
Hoff Don G.
Park Daniel J.
Rose Donald T.
At&e Corporation
Oyen Wiggs Green & Mutala Llp
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