Facsimile and static presentation processing – Facsimile – Auxiliary signal
Patent
1993-10-01
1996-07-09
Rogers, Scott A.
Facsimile and static presentation processing
Facsimile
Auxiliary signal
358438, 358442, H04N 132, H04N 1327
Patent
active
055350143
ABSTRACT:
A method for allowing data communication equipment, such as a facsimile modem, to communicate in a more reliable manner with a facsimile machine. The data communication equipment is interconnected to data terminal equipment, such as a personal computer. The data terminal equipment may include an interrupt driver or controller that only periodically directs the data terminal equipment to retrieve message data from memory and forward it, via a serial port, to the data communication equipment. If the interruption in the transmission of characters to the data communication equipment is too long, no data may be sent to the facsimile machine, which may interpret the absence of data as an indication that the communication link has been disconnected and, thus, abort the call. The method includes the steps of monitoring the message data sent to the data communication equipment for an end of line sequence. If no end of line sequence is detected, the line segment of the message data is not transmitted, and a buffering signal, such as string of binary zeros, is sent to the facsimile machine. The buffering signal effectively advises the receiving facsimile machine that the call has not been terminated, even though additional message information is not being sent. When an end of line sequence is eventually detected in the message data from the computer, the line segment of message data may be sent to the facsimile machine.
REFERENCES:
patent: 5018022 (1991-05-01), Tatsumi
Electronics Industry Association/Telecommunications Industry Association "Asynchronous Facsimile DCE Control Standard" (Nov. 1990) (ANSI/EIA/TIA-578-1990; Approved Oct. 22, 1990).
CCITT Recommendation T.30 on "Procedures for Document Facsimile Transmission in the General Switched Telephone Network".
CCITT Recommendation T.4 on "Standardization of Group 3 Facsimile Apparatus for Document Transmission" (Geneva 1980, amended at Malaga-Torremolinos 1984, and Melbourne 1988).
Rogers Scott A.
U.S. Robotics, Inc.
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