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• CCITT Rec. T.4 (11/1988) – STANDARDIZATION OF GROUP 3 FACSIMILE APPARATUS FOR DOCUMENT TRANSMISSION
• 1 Scanning track
• 2 Dimensions of apparatus
• 3 Transmission time per total coded scan line
• 4 Coding scheme
  • 4.1 One-dimensional coding scheme
  • 4.2 Two-dimensional coding scheme
  • 4.3 Error limiting mode
• 5 Modulation and demodulation
• 6 Power at the transmitter output
• 7 Power at the receiver input
• 8 Implementation of apparatus
• ANNEX A – Optional error correction mode
• A.1 Introduction
• A.2 Definitions
• A.3 Message format
• ANNEX B – Optional error limiting mode
• B.1 Data
• B.2 End of line (EOL)
• B.3 Fill
• B.4 Return to control (RTC)
• ANNEX C – Interworking between equipments with A5/A6 and A4 facilities ...
• APPENDIX I – Guaranteed reproducible area for Group 3 apparatus conforming to Recommendation T.4