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6. TRANSMISSION CONTROL PROCE-
DURES
With G3 facsimiles, the document size, recording paper size, MODEM
type and other factors differ according to the product. For this reason, G3
facsimiles use special signals to handle mutual information about func-
tions and states on the transmitting and receiving sides. This handling of
information for ensuring that communications is proceeded with smoothly
is called "transmission control," and the procedure for transmission control
is called "transmission control procedure."
Here, let's describe the transmission control procedures that are currently
used on G3 facsimiles.
6.1
Outline of Transmission Control Procedures
When transmission is performed on G3 facsimiles, first the signal of the
receiving side is asked for to verify the performance and functions of the
other party. Next, the mode to transmit is notified and the coded image is
sent. When transmission of the image ends, the receiving side is notified as
to whether there is another page after that page or that is the end of the
image. After verification is obtained, communications is ended.
In this way, the image signals are not only sent; signals are handled
between facsimiles before and after the image signals. All handling of this
information is performed by digital signals of 1/0. These meaningful digi-
tal signals are called "binary signals" due to the fact that they are expressed
in binary, and these procedures are called "binary procedures."
G3 FACSIMILE COMMUNICATIONS
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