lines. Determined in 1968.
Transmission for about 6 minutes at a scanning line density
of 3.85 lines/mm.
- Group II (G2)
Using reduction technology in the modulation/demodulation
format, an A-4 size document is sent at an official scanning
line density of 3.85 lines/mm for about 3 minutes.
Methods to suppress redundancy are not used.
Determined in 1976.
- Group III (G3)
Method of suppressing redundancy in the image signal prior
to modulation is used. An A-4 size document is sent within
about one minute.
Determined in 1980.
- Group IV (G4)
Transmission is via the data network. A method is provided
for suppressing redundancy in signals prior to transmission,
and error-free reception of transmission is possible.
The scope of these facsimile applications is not limited
simply to transmission of written statements. Through
symbiotic linkages with other communication methods, it can
be expected to expand to include integrated services.
3. Facsimile Call Time Series
As shown in the following diagram, the facsimile call time series
is divided into five phases.
Phase A : Call setting
Call setting can be manual/automatic.
Phase B : Pre-message procedure
Phase B is a pre-processing procedure and sequence for
confirming the status of the terminal, transmission route, etc., and
for terminal control. It implements terminal preparation status,
determines and displays terminal constants, confirms
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