Telephone network including common equipment with message inform

Details Telephone network including common equipment with message inform Telephone network including common equipment with message inform

1980-02-11

1982-12-14

Brigance, Gerald L.

179 99M, H04Q 518

Patent

active

043639364

ABSTRACT:
A private telephone network that includes multifunction telephones. Multifunction telephones are connected to common equipment by a voice signal path and a data signal path. Supervisory information passes over the data signal path in the form of polled messages that are sent from the common equipment to the telephone. Sense information is received by the common equipment from the telephone. The transmission is by frequency modulation, such as frequency-shift-keying modulation, techniques. At the multifunction telephone, a programmed microcomputer contains three blocks of instructions for enabling the microcomputer to perform background operations, to respond to the initial receipt of a message, and to thereafter transmit and decode the message. Further, in response to the decoding block of instructions, that are provided on a fixed time basis, the microcomputer is able to transmit frequency-shift-keyed signals without the need for a separate frequency-shift-keyed transmitter.

REFERENCES:
patent: 3973085 (1976-08-01), Shiff
patent: 4061887 (1977-12-01), Kasson et al.
patent: 4125749 (1978-11-01), Kinoshita et al.
patent: 4160131 (1979-07-01), Kaul et al.
patent: 4203011 (1980-05-01), Coviello
"ITT Electronic Key Telephones", F-482-1, (1-77) 2M, Issue 1, Jan. 1977.
ITT Telecommunications Apparatus Dept. Sales Bulletin, vol. No. II, Issue No. 23, 11-30-77, "Electronic Key System".
"Novakey Data Controlled Key System", Electrical Communications, vol. 52, No. 4, 1977.

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