General Electric employs a 1-second first tone and a 1.5-second second tone, and does not allow for any group call. The system employs six reed groups of ten tones each, which permit about 870 codes in the basic tone pairing scheme and approximately 3,500 tone pairs in an extended assignment plan. The most popular are: the Motorola two-tone, Motorola five-tone, Motorola six-tone, General Electric two-tone (Type 99), and Reach two-tone signalling formats.Īttempts have been made to provide paging encoders which are capable of operating within the requirements of the various signalling formats, but such systems have been expensive to design and fabricate due to the numerous differences between the various formats.įor example, Motorola utilizes one second for the first tone, two to three seconds for the second tone, and requires seven to eight seconds for group calls. Incompatibility between signalling formats of the various paging systems creates a severe handicap on prior art systems because numerous formats are currently employed. Traditionally, paging encoders have been bulky, expensive, desk bound units suffering from limited capacity and a lack of adaptability which would allow operation across the spectrum of different selective signalling formats. This invention relates to a paging encoder which utilizes a microcomputer to produce two-tone sequential or five-tone codes which are transmitted via an associated transmitter to portable telephone paging receivers.
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