ITU-T Rec. T.4 (07/1996) – Standardization of Group 3 facsimile terminals for document transmission
FOREWORD
CONTENTS
SUMMARY
Introduction
1 Scanning track
2 Dimensions of terminals
3 Transmission time per total coded scan line
    3.1 Minimum transmission time of total coded scan line
    3.2 Maximum transmission time of total coded scan line
    3.3 Error correction mode
4 Coding scheme
    4.1 One-dimensional coding scheme
    4.2 Two-dimensional coding scheme
    4.3 Extended two-dimensional coding scheme
    4.4 Progressive bi-level image compression
5 Modulation and demodulation
6 Power at the transmitter output
7 Power at the receiver input
8 Implementation of terminals
9 File transfer mode
10 Character mode
11 Mixed mode
12 64 kbit/s option
13 Continuous-tone colour and gray-scale modes
Annex A – Optional error correction mode
A.1 Introduction
A.2 Definitions
A.3 Message format
Annex B – Optional file transfer mode
B.1 Introduction
B.2 Definitions
B.3 Normative references
B.4 Definition of the different file transfer modes
B.5 Coding of the file description
B.6 Message format - Blocks structure
B.7 Protocol aspects
Annex C – Optional character mode
C.1 Introduction
C.2 Definitions
C.3 Normative references
C.4 Graphic character set - Repertoire and coding
C.5 Page format
C.6 Control functions
C.7 Message format - Blocks structure
C.8 Protocol aspects
C.9 Imaging process
Annex D – Optional mixed mode
D.1 Introduction
D.2 Definitions
D.3 Facsimile Control Field (FCF)
D.4 Frame numbering
D.5 Facsimile data field
D.6 Character coded data field
D.7 Graphic character set
D.8 Page format
D.9 Control functions
D.10 End Of Retransmission (EOR)
Annex E – Optional continuous tone colour mode
E.1 Introduction
E.2 Definitions
E.3 References
E.4 Definition of different multi-level image transfer modes
E.5 Coding of the image description
E.6 Data format
Annex F – Facsimile Group 3 64 kbit/s option F [G3F]
F.1 Introduction
F.2 Terminal characteristics for G3F
F.3 Protocol set
F.4 Basic procedure for the interchange of Group 3 64 kbit/s option F facsimile document
F.5 Interworking
Appendix I – Guaranteed reproducible area for Group 3 terminals conforming to Recommendation T.4
Appendix II – Repertoire of box-drawing characters for character mode of Group 3 terminals