Key telephone system without common control

Details Key telephone system without common control Key telephone system without common control

1998-05-26

2000-07-11

Olms, Douglas W.

Multiplex communications

Channel assignment techniques

Combining or distributing information via time channels...

370278, 370294, 375220, 375222, 379 9311, H04J 300, H04B 156, H04L 514

Patent

active

060883626

ABSTRACT:
A multi-line key telephone system not having a key service unit includes three analog telephone lines to which up to eight, three-line telephones may be connected to provide enhanced service features with cost-effectiveness. System reliability is maintained, notwithstanding a power dependency of the telephones, by including POTS telephones to provide uninterrupted essential telephone service in the event of a power outage. Both data and voice communications between two or more of the three-line telephones is achieved by converting an input digital bit stream from either a digital or analog source into a corresponding out-of-band binary FSK radio frequency output signal that is transceivingly communicated between the three-line telephones as data packets within a TDM frame. The out-of-band signal thus permits analog voice communications on the same line to proceed without interference. A telephone initiating a communications session acts as a master station, establishing inter-station communications synchronous at the frame level and asynchronous at the packet level. The called telephone functions as a slave station in a second time slot synchronized to a first time slot in the TDM frame received from the master. Temporary storage of data in firmware buffers and controlled timing at both the master and slave permits these stations to function within their respective TDM frame time slots.

REFERENCES:
patent: 3562432 (1971-02-01), Ova
patent: 4049908 (1977-09-01), Knorpp et al.
patent: 4068198 (1978-01-01), Otto
patent: 4488120 (1984-12-01), Carsten
patent: 4538136 (1985-08-01), Drabing
patent: 4567603 (1986-01-01), Howell et al.
patent: 4633425 (1986-12-01), Senderowicz
patent: 4670888 (1987-06-01), Smith, III
patent: 4691342 (1987-09-01), Waldron et al.
patent: 4724534 (1988-02-01), Guzman-Edery et al.
patent: 4766599 (1988-08-01), Miyazaki
patent: 4825448 (1989-04-01), Critchlow et al.
patent: 5014285 (1991-05-01), Basile et al.
patent: 5054034 (1991-10-01), Hughes-Hartogs
patent: 5124698 (1992-06-01), Mustonen
patent: 5130676 (1992-07-01), Mutz
patent: 5140611 (1992-08-01), Jones et al.
patent: 5329258 (1994-07-01), Matsuura
patent: 5416779 (1995-05-01), Barnes et al.
patent: 5555276 (1996-09-01), Koenck et al.
patent: 5561412 (1996-10-01), Novak et al.
patent: 5648993 (1997-07-01), Kawada
patent: 5657344 (1997-08-01), Na
patent: 5787115 (1998-07-01), Turnbull et al.

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