Browse Prior Art Database

Background Communications for Computer-Attached Facsimile

IP.com Disclosure Number: IPCOM000100754D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 1 page(s) / 40K

Publishing Venue

IBM

Related People

Cecil, RH: AUTHOR [+8]

Abstract

Disclosed is a process for receiving or transmitting a facsimile data stream to or from a permanent storage medium. This process is transparent to an operator running a foreground computer application.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 84% of the total text.

Background Communications for Computer-Attached Facsimile

       Disclosed is a process for receiving or transmitting a
facsimile data stream to or from a permanent storage medium. This
process is transparent to an operator running a foreground computer
application.

      A communications program handles the data transfer between the
telephone line and the volatile computer memory. Once initiated, this
program services a communications hardware interrupt.  A data storage
program is invoked from a periodic interrupt (e.g., the timer
interrupt in an IBM PC).  This program moves the facsimile data from
the volatile memory to a permanent storage medium (e.g., fixed disk).
Because these programs are invoked from hardware interrupts, they can
run concurrently with an independent foreground application.

      The data storage program interrogates the status of the
communications.  When an incoming facsimile call is detected, the
data storage program invokes the communication program to initiate
reception.  The data storage program generates a unique name for the
receive file based on the Julian day, the hour, the minute and the
closest tenth of a minute.  During reception, when a receive buffer
becomes full, the data storage program copies the buffer data from
memory to a file in permanent storage.  The file is closed when
receive status indicates that the reception is complete or
communications were aborted.

      When a facsimile transmission is initiat...