5. Facsimile Standards
Item
Telephone Network Facsimile
G3 Machine
Connection Control Mode Telephone Network Signal Mode
Terminal Control Mode T. 30 Binary
Facsimile Signal Format Digital
Modulation Mode PSK (V. 27 ter) or QAM (V. 29)
Transmission Speed
300 bps (Control Signal)
2400, 4800, 7200, 9600 bps (FAX Signal)
Redundancy Compression
Process
(Coding Mode)
1 dimension : MH Mode
2 dimension : MR Mode (K=2.4)
Resolution
Main Scan : 8 pel/mm
Sub Scan : 3.85, 7.7l/mm
Line Synchronization
Signal
EOL Signal
1 Line Transmission Time
[ms/line]
Depends on the degree of data reduction.
Minimum Value : 10, 20
Can be recognized in 40ms.
6. Explanation of Communication and Compression Technology
a. G3 Communication Signals (T. 30 Binary Process)
For G3 Facsimile communication, this is the procedure for exchanging control signals between
the sending and receiving machines both before and after transmission of image signals.
Control signals at 300 bps FSK are: 1850 Hz...0, 1650Hz...1.
An example of a binary process in G3 communication is shown below.
Explanation of Signals
175
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