Multiplex communications – Wide area network – Packet switching
Patent
1994-03-18
1996-08-13
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
359425, H04L 1256
Patent
active
055463886
ABSTRACT:
A packet-switched facsimile network and method of operation, wherein the network includes a plurality of facsimile stations, and a plurality of nodes for connecting the facsimile stations. The network includes subscribers' transmission channels, such as telephone switched network, for connection to the facsimile stations, and common transmission channels, such as dedicated lines and packet switched network, for connection to the nodes, in order to allow the facsimile stations to communicate with each other. In operation, the part of image data received from a plurality of facsimile stations is formed into data packets at the nodes. Simultaneously, the formed data packets are sent via the common transmission channels to destination nodes, and therefrom to appropriate receiving facsimile stations. It is possible that during transmission, the destination node may transmit image data contained in one data packet, while it has not received the next data packet that contains image data to be sent subsequently, which could cause transmission error. As a result, the destination node selectively inserts fill codes into the image data. In the preferred embodiment, the facsimile network is a packet switching Group 3 facsimile network and the G3 machines can communicate with each other point-to-point, via the packet-switched facsimile network.
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International Search Report for PCT application corresponding to the present patent application (PCT/SG95/00003, mailed on Jun. 30, 1995.
CCITT X.5-Facsimile Packet Assembly/Disassembly Facility (FPAD) in a Public Data Network (1992).
CCITT X.38-G3 Facsimile Equipment/DCE Interface for G3 Facsimile Equipment Accessing the Facsimile Packet Assembly/Disassembly Facility (FPAD) in a Public Data Network Situated in the Same Country. (1992).
CCITT X.39-Procedures for the Exchange of Control Information and User Data Between a Facsimile Packet Assembly/Disassembly (FPAD) Facility and a Packet Mode Data Terminal Equipment (DTE) or another FPAD. (1992).
Kassatly Samuel A.
Olms Douglas W.
Ton Dang
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