Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1976-11-10
1977-11-15
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
178 3, H04N 132, H04L 1120
Patent
active
040588386
ABSTRACT:
A packet-switched facsimile communication system operable in a store-and-forward mode is provided for enabling substantially simultaneous full-duplex communication between a plurality of telecommunications terminals, such as facsimile transceivers, over a communications network with a plurality of other facsimile transceivers having access to the communications network and with which such communication is desired. The disclosed packetizing of data and transmission thereof in a store-and-forward mode with dynamic routing provides a highly efficient utilization of the transmission facilities, substantially error-free data transmission and a handshake capability between a wide variety of dissimilar and otherwise incompatible facsimile machines having differing protocols, modulation techniques and other speed and code characteristics. Large blocks of data and other message information from facsimile data terminals are subdivided into data packets prior to transmission, converted into a systemwide compatible protocol, compressed, transmitted independently and time multiplexed with other packetized data from other terminals on the communications network, stored and forwarded on a priority basis and in accordance with network availability at one or more switching nodes in the network, reassembled from the received packets at a destination processor into the original data messages for coupling to the message destination terminals such that the received message is decompressed and reconverted into a format compatible with the destination terminal characteristics to enable information interchange therebetween.
REFERENCES:
patent: 3751582 (1973-08-01), Wernikoff et al.
patent: 3920895 (1975-11-01), Vieri et al.
patent: 3958088 (1976-05-01), Vieri
patent: 3982061 (1976-09-01), Dorey et al.
patent: 4000371 (1976-12-01), Ogawa
Crager William C.
Griffin Robert H.
Louit Gerard J.
Umarji Sudhindra R.
Britton Howard W.
International Telephone and Telegraph Corporation
Morris Jeffrey P.
O'Halloran John T.
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