This part specifies the terminal characteristics of the document fax type 3 machine used in the public telephone exchange network, as well as in the international leased circuit and the integrated services digital network (ISDN). The document fax type 3 machine can transmit black and white documents, and as an option, it can also transmit color documents. This part applies to the design, production, inspection and use of document fax type 3 machines, and is the main technical basis for document fax type 3 machines. GB/T 3382.1-2003 Technical conditions for the interoperability of document fax type 3 machines in the telephone network Part 1: Standardization of type 3 fax terminals for file transmission GB/T3382.1-2003 standard download decompression password: www.bzxz.net

ICS 33. 040. 70
National Standard of the People's Republic of China
GB/T 3382.1—-2003/ITU-T T.4:1996 replaces GB/T3382—1993
Technical requirements for group 3 facsimile apparatus used in public telephone network-Part 1 : Standardization of group 3 facsimile terminals for document transmission(ITU-T T, 4:1996,Standardization of group 3 facsimile terminalsfor document transmission,IDT)Promulgated on November 19, 2003
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on June 1, 2004
GB/T 3382.1--2003/ITU-TT.4:1996 GB/T3382 "Technical conditions for the interoperability of three types of fax machines in the telephone network" is divided into two parts: Part 1: Standardization of three types of fax terminals for file transmission; Part 2: File fax transmission procedures on the public telephone exchange network. This part is the first part of GB/T3382, corresponding to ITU-T Recommendation T.4 "Standardization of three types of fax terminals for file transmission". The consistency of this part is the same as that of ITU-T Recommendation T.4. This part replaces the first part of GB/T3382-1993 "Technical conditions for the interoperability of three types of fax machines in the telephone network": Standardization of three types of fax machines. This revision adopts the 1996 version of the blue book of ITU-T Recommendation T.4 "Standardization of Group 3 Facsimile Terminals for File Transfer", T.4 Amendment 1 (July 1997 version), and T.4 Amendment 2 (October 1997 version); at the same time, the errors in ITU-T Recommendation T.4 were corrected according to the Errata 1 published in June 1998. Compared with Part 1 of GB/T3382-1993, this Part has the following major changes: the horizontal scanning line density of 16 dots/mm, the vertical scanning line density of 15.4 lines/mm, and the paper size of A3 width (303mm) have been added, while the paper sizes of A5 (151mm) and A6 (105mm) width have been deleted (2.1 of the 1993 edition and this edition);
-The scanning line density of 7.7 lines/mm as the standard resolution in GB/T3382-1993 has been changed to an optional resolution, making it the same as the requirements of ITU-T Recommendation T.4 (2.1 of the 1993 edition and this edition); - Added the inch-based scan line density (2.2 of this edition); - Changed the maximum transmission time of the full-coded scan line from 5s to 13s (3.2 of the 1993 edition and this edition); Deleted the error-limited coding scheme (4.3 and Appendix B of the 1993 edition); Newly added the improved relative address coding scheme (MMR), the incremental two-level image compression coding scheme (JBIG) and the single incremental continuous image compression coding scheme (4.3, 4.4 and 4.4.2 of this edition); Newly added YD/T853 (recommended V.17-maximum transmission rate 14400bit/s) and YD/T954 (recommended V.34-maximum - Added two high-speed modulation and demodulation schemes with a high transmission rate of 28800bit/s or 33600bit/s (Note 3, Note 4, Note 5 of 5.2 of this edition); - Added optional fax document transmission mode (Chapter 9 and Appendix B of this edition); - Added optional character transmission mode (Chapter 10 and Appendix C of this edition); - Added optional mixed transmission mode (Chapter 11 and Appendix D of this edition); - Added 64kbit/s fax transmission mode for applying fax type 3 machines to digital networks (Chapter 12 and Appendix F of this edition); - Added continuous tone color and grayscale fax transmission modes (Chapter 13 and Appendix E of this edition); - Added relevant fax Basic requirements for secure communication methods (Chapter 14 of this edition); - Add basic requirements for lossless transmission of 1 bit per color for toning color, continuous tone color and grayscale images using Recommendation T.43 (Chapter 15 and Appendix G of this edition); - Add requirements for mixed raster content (MRC) for Class 3 fax machines (Chapter 16 and Appendix H of this edition); - Add a general table of block diagram characters for Class 3 fax terminal character mode (Annex II of this edition); Delete the original Appendix C "Intercommunication between fax machines with A5/A6 performance and A4 performance fax machines and fax machines with these performance combinations" (Appendix C of the 1993 edition). Appendices A, B, C, D, E, F, G and H of this part are normative appendices, and Annexes I and II are informative.
This part is proposed by the Ministry of Information Industry of the People's Republic of China. This part is under the jurisdiction of the Institute of Telecommunications Science and Planning. H
GB/T3382.1—2003/ITU-TT.4:1996The drafting unit of this part: Telecommunication Transmission Research Institute. The main drafters of this part: Cui Jinshui, Gou Yali, Li Shidong, Shi Xiaohui, Han Guojie. The previous versions of the standards replaced by this part are: GB/T3382—1982, GB/T3382--1985, GB/T3382—1991, GB/T3382—1993IV
GB/T 3382.1—2003/ITU-T T.4: 1996The national standard GB/T3382 for document fax type 3 machines has been implemented for 20 years. It has played an important guiding role in the application and development of fax type 3 machines in my country. GB/T3382 is formulated based on ITU-T (International Telecommunication Union - Telecommunication Standardization Sector) Recommendation T.4 "Standardization of Class 3 Fax Terminals for File Transmission" and T.30 "Procedure for File Fax Transmission on the Public Switched Telephone Network". With the development of fax communication technology, ITU-T has made substantial revisions and expansions to Recommendations T.4 and T.30, deleting technical contents that have proven to have no application value in actual use, and adding various new technical requirements. At present, these new technologies have been widely used in new fax machines. Therefore, GB/T3382 is revised again, and new technical contents are added to adapt to the development of technology and application requirements. This part is the first part of the revised GB/T3382., corresponding to ITU-T Recommendation T.4. I Scope
This part specifies the terminal characteristics of Class 3 file fax machines used on the public switched telephone network, as well as on international leased circuits and the Integrated Services Digital Network (ISDN). The Class 3 file fax machine can transmit black and white documents, and as an optional mode, it can also transmit color documents, etc.
This part applies to the design, production, inspection and use of the third type of document fax machines, and is the main technical basis for the third type of document fax machines. Ⅱ Normative reference documents
The clauses in the following documents become the clauses of this part through reference to this part of GB/T3382. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, the parties who reach an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this part.
GB/T3382.2-2003 Technical conditions for interoperability of three types of document fax machines in the telephone network Part 2: Procedures for document facsimile transmission in the general switched telephone network (ITU-T T.30:1996, Procedures for document facsimile transmission in the general switched telephone network, IDT) GB/T7616-1987 Equivalence between binary representation symbols and meaningful states of two-state codes (eqvITU-T Recommendation V.1:1984)
Power level for data transmission on telephone lines (eqvITU-T Recommendation V.2:1984) GB/T7617-1987
GB/T7620-1987
Standardized 300 bit/s full-duplex modem for use in telephone automatic switching networks (eqvITU-T Recommendation V.21:1984)
GB/T13129-1991 Technical conditions for interworking of Chinese intelligent user telegrams on public telecommunications networks (eqvITU-T Recommendation T.62:1989)
Technical conditions for interworking of Chinese intelligent user telegrams on public telecommunications networks Transport services (eqvITU-T GB/T13130-1991
Recommendation T.70:1989)
GB/T14805-1993 Application-level syntax rules for electronic data interchange for administration, commerce and transport (idt ISO973 5:1988)
GB/T15273.1-1994 Information processing eight-bit single-byte coded graphic character set Part 1: Latin alphabet one (idtISO8859-1:1987)
YD/T853--1996 Technical requirements for two-wire modems for fax at rates up to 14400 bit/s (eqvITU-T Recommendation V.17)
YD/T945-1998 Data signaling rates up to 33600 V for use in the public switched telephone network and point-to-point two-wire dedicated circuits
GB/T 3382.1-2003/ITU-T T.4: 1996 bit/s modem (idtITU-T Recommendation V.34) YD/T951--1998 Characteristics and protocols of ISDN telematic service terminals (eqvITU-T Recommendation T.90) ITU-T Recommendation F.551 (1993) Service recommendations for telematic document transmission in group 3 user fax, group 4 user fax, intelligent user telegraph service and message processing service ITU-T Recommendation T.35 (1994) CCITT defined regulations for the allocation of non-standard facility codes ITU-T Recommendation T.42 (1994) Continuous tone color representation method for fax ITU-T Recommendation T.43 (1997) for fax using lossless coding scheme ITU-T Recommendation T.434 (1996) Binary file transfer format for telematic services ITU-T Recommendation T.44 (1997) Mixed Raster Content (MRC) ITU-T Recommendation T.505 (1991) File application profile PM-26 for interchange of mixed content files in processable and formatted forms
ITU-T Recommendation T.521 (1994) Communication application profile BTO for batch file transfer over session-based services (based on the rules defined in Recommendation T.62B)
ITU-T Recommendation T.82 (1993) Information technology - Coded representation of video and speech information - Incremental two-level image compression ITU-T Recommendation T.85 (1995)
Coding Schemes)
Application Profiles of Recommendation T.82 - Incremental Secondary Image Compression for Facsimile Equipment (JBIG)ITU-T Recommendation V.27C Standardized 4800/2400 bit/s modems for use in public data networksITU-T Recommendation V.29 Standardized 9600 bit/s modems for use on point-to-point four-wire leased telephone-type circuitsCCITT Recommendation T.6 (1988) Facsimile coding schemes and coding control functions for Category 4 fax machinesCCITT Recommendation T.50 (1992)
International Alphabet (IRA) (formerly International Alphabet No. 5 or IA5) - Information technology - 7-bit coded character set for information interchange
CCITT Recommendation T.51 (1992):
Latin coded character set for telematic servicesCCITT Recommendation T.81 (1992)
and Coding - Requirements and criteria
ISO/IEC10918-1:1993, Information technology - Digital compression of continuous-tone still images
CCITT Recommendation X.209 (1988) Specification of basic encoding rules for Abstract Syntax Notation 1 (ASN.1) CIE Publication No. 15.2 Colorimetry, Second Edition, 1986VI
1 Scanning trajectory
GB/T 3382.1—2003/ITU-T T.4:1996 Technical requirements for interoperability of group 3 fax machines in the telephone network for document transmission Part 1: Standardization of group 3 fax terminals for document transmission
In both the transmitter and the receiver, the message area shall be scanned in the same direction. Viewing the message area in the vertical plane, the pixels shall be processed so that the scanning direction is from left to right and the subsequent scan line is immediately below the previous scan line. 2 Terminal size
Note: The tolerance of the cooperation factor is for further study. 2.1 For ISOA4, ISOB4, ISOA3, North American letter cage (215.9mm×279.4mm) and lawyer's document paper (215.9mmX355.6mm), the following sizes should be used:
a) In the vertical direction, the standard resolution is 3.85×(1±1%) lines/mm; b) In the vertical direction, the selected high resolution is 7.7×(1±1%) lines/mm and 15.4×(1±1%) lines/mm, c) There are 1728 black and white pixels on a standard scanning line of 215×(1±1%) mm; d) On a 255 × (1 ± 1%) mm long standard scan line has 2048 black and white pixels, this is optional; 2432 black and white pixels on a standard scan line of 303 × (1 ± 1%) mm long, this is optional; e)
f) 3456 black and white pixels on a standard scan line of 215 × (1 ± 1%) mm long, this is optional; g) 4096 black and white pixels on a standard scan line of 255 × (1 ± 1%) mm long, this is optional; h) 4864 black and white pixels on a standard scan line of 303 × (1 ± 1%) mm long, this is optional. As an option, as described in Appendix E (impaired mode) and Appendix G (unimpaired mode), three types of fax terminals can be used to transmit color and continuous tone images. Appendix E and Appendix G do not support a vertical resolution of 3.85 lines/mm. Optionally, multilevel data and bilevel data resulting from the encoding of color grayscale and text/line art, respectively, may be sent on the same document page as described in Annex H (Mixed Raster Content). All sizes for the three types of machines may be used with the procedures in Annex H. Annex H does not support non-square resolutions of 8 dots × 3.85 lines/mm. 2.2 The following sizes shall be used for inch-based resolutions. Table 1 gives the optional inch-based resolution requirements and their pixels. Table 2 gives the specified number of pixels per line for all three types of machine resolutions for ISOA4, ISOB4, ISOA3, North American Letterhead, and Attorney's Office Paper. The use of one or more of 200 × 200 pixels/25.4 mm, 300 × 300 pixels/25.4 mm, and 400 × 400 pixels/25.4 mm may be implemented in lieu of standard resolutions of 200 pixels/25.4 mm horizontally × 100 pixels/25.4 mm vertically. 2.3 A minimum input file size of ISOA4 shall be accepted. Note: The size of the guaranteed copy area is given in Annex 1. 3 Transmission time of the full coded scan line
The full coded scan line is defined as the sum of the number of data bits plus the number of required padding bits and the number of line end code bits. For the selected two-dimensional coding scheme described in Section 4.2, the full coded scan line is defined as the sum of the number of data bits plus the number of required padding bits, the number of line end code bits and 1 feature bit. In order to handle various printing methods, several selected minimum full coded scan line times can also be used in addition to the 20 ms standard. Table 1
Resolution
(pixels/25.4 mm)
-Horizontal
ISO A4
North American letter cage/lawyer's briefcase
864/219.46 mm
1 728/219. 46 mm
2 592/219.46 mm
3 456/219.46 mm
Number of pixels on a scan line
ISO B4
1 024/260.10 mm
2 048/260. 10 mm
3 072/260. 10 mm
4096/260.10 mm
1 216/308.86 mm
2 432/308.86 mm
3 648/308.86 mm
4 864/308.86 mm
Note: It can be considered that the resolution is 200×200 pixels/25.4 mm and 8×7.7 lines/mm are equivalent. Similarly, the resolutions 400×400 pixels/25.4 mm and 16×15.4 lines/mm can be considered equivalent. As a result, in this case, no conversion is required when communicating between English-based terminals and metric-based terminals. However, communicating between these resolutions will cause distortion and compression of the reproduced area. The minimum transmission time of the full-coded scan line
The minimum transmission time of the full-coded scan line should comply with the following regulations: 1) Option 1 can be adopted, and the same minimum transmission time of the full-coded scan line is used for both standard resolution and selected high resolution:
a) 20 ms is the standard time;
b) 10ms is the recognized selected time, which should be able to be forced to be reduced to the standard 20ms; 5 ms is the recognized selected time, which should be able to be forced to be reduced to the selected 10 ms and the standard 20 ms; c)
d) 0ms is the recognized selected time, which should be able to be forced to be reduced to the selected 5ms, 10ms and standard 20ms, and can be optionally reduced to the selected 40 ms;
e) 40 ms is the recognized selected time.
2) Option 2 can be used. The minimum transmission time of the full-coded scan line in the case of high resolution is half of that in the case of standard resolution (see note). The following figures are for standard resolution: a) 10 ms is the recognized selection time, which should be able to be forced to be reduced to 20 ms as the standard; b) 20ms is the standard time;
c) 40ms is the recognized selection time.
The identification and selection of this minimum transmission time should be carried out in the message front (stage B) part of the control procedure of GB/T3382.2. Note: Option 2 is applicable to the terminal of the recording mechanism that uses continuous printing of two identical high-resolution scan lines to obtain standard vertical resolution. In this case, the minimum transmission time of the full-coded scan line in the case of standard resolution is twice that of the case of high resolution. The minimum transmission time in the case of 15.4 lines/mm resolution and 400 lines/25.4mm can be one-quarter of the standard resolution. 3.2 Maximum Transmission Time of Fully Encoded Scan Line
The maximum transmission time of any fully coded scan line must be less than 13 seconds. When the transmission time exceeds 13 seconds, the receiver must disconnect. However, receivers that comply with previous standard versions disconnect when the transmission time exceeds 5 seconds. 2
White run length
00110101
000111
001000
00 0011
110100
110101
101010
101011
0 100111
0001100
0001000
0010111
0000011| |tt||0000100
0101000
0101011
0010011
01 00100
0011000
00000010
00000011
000110 10
00011011
00010010
00010011
00010100| |tt||00010101
00010110
00010111www.bzxz.net
00101000
00101001
00101010
00101011
3382. 1—2003/ITU-T T. 4 : 1996 black run length
0000110111
000101
000100
0000100
0000101| |tt||0000111
00000100
00000111
000011000
0000010111
0000011000
0000001000
00001100111
00001101000
00001101100
00000110111
00000101000
00000010111
00000011000
000 011001010
000011001011
000011001100
000011001101
0000011 01000
000001101001
000001101010
000001101011
000011010010
000011010011
000011010100
000011010101
000011010110||tt| |000011010111
000001101100
000001101101
000011011010
GB/T 3382.1—2003/ITU-T T.4:1996 white run length
3.3 error correction method
00101100
00101101
00000100
00000101
0000 1010
00001011
01010010
01010011
01010100
01010101
00100100
00100101
01011000
01011001
01011010
01011011
01001010
01001011|| tt||00110010
00110011
00110100
Table 2 (continued)
Black run length
000011011011
000001010 100
000001010101
000001010110
000001010111
000001100100
000001100101| |tt||000001010010
000001010011
000000100100
000000110111
000000111000
000000100111
000000101000
000001011000
000001011001
000000101011
000000101100
0000001011010
000001100110
An optional error correction scheme uses HDLC frames to transmit fully coded scan lines. Appendix A specifies this error correction scheme. 4 Coding Schemes
4.1-Dimensional Coding Schemes
The one-dimensional run-length coding scheme used for three types of fax terminals is as follows. 4.1.1 Data
The data of a scan line consists of a series of variable length code words. Each code word represents a run length of all white or all black. Black and white runs appear alternately. A total of 1728 pixels represent a horizontal scan line of 215 mm in length. In order to keep the receiver color synchronized, all data lines start with a white run length code word. If the actual scan line starts with a black run, a white run length of zero length is sent. The black and white run lengths within the maximum length of a scan line (1728 pixels) are specified by the code words in Tables 2 and 3. There are two types of code words: end code words and combined base code words. Each run length is represented by an end code word or a combined base code word plus an end code word. Run lengths within the range of 0 to 63 pixels are encoded with the corresponding end code words. It should be noted that there are different code word tables for black and white run lengths.
The run length in the range of 64 to 1728 pixels is first encoded with a combined backbone codeword representing a run length equal to or shorter than the required run length. This is followed by an end codeword representing the difference between the required run length and the run length represented by the combined backbone code.
4.1.2 End of Line Code (EOL)
GB/T 3382.1—2003/ITU-T T, 4:1996 This codeword follows each scan line data. The end of line codeword is the only codeword that cannot appear in the valid scan line data. Therefore, resynchronization is possible after a burst error occurs. In addition, this signal is set before the first data line of a page. Format: 000000000001
4.1.3 Filling
Pauses can be inserted into the information stream by sending filling codes. Stuffing codes can be inserted between scan line data and line end codes, but never between scan line data. Stuffing codes must be added to ensure that the transmission time of data, stuffing and EOL is not less than the minimum transmission time of the full coded scan line established by the pre-message control procedure. The maximum transmission time of the stuffing bit should be less than 5s. 4.1.4 Return to Control (RTC)
Continuous transmission of 6 line end codes indicates the end of the file transmission. After the RTC signal, the transmitter will send the post-message command according to the control signal frame format and data signal rate defined in GB/T3382.2. Format: 000000000001.....000000000001 (a total of 6)
Figures 1 and 2 illustrate the relationship between the various signals specified above. Figure 1 shows the first few scan line data of the beginning of a page of the transmitted original. Figure 2 shows the last coded scan line of a page. The identification and selection of the standard code table or the extended code table shall be carried out in the pre-message (phase B) part of the control procedure in GB/T3382.2. Start of phase C
T: Minimum transmission time of a fully coded scan line. Data
End of phase C
GB/T3382.1—2003/ITU-TT.4:1996 White run length
010111
0110111
00110110
00110111
01100100
01100101||tt ||01101000
01100111
011001100
011001101
0110 10010
011010011
011010100
011010101
01101011 0
011010111
011011000
011011001
011011010||t t||011011011
010011000
010011001
010011010
0 11000
010011011
000000000001
Combined backbone code
Black run length
0000001111
000011001000
000011001001
0000010110 11
000000110100
000000110100
000000110101
00 00001101100
0000001101101
0000001001010
000000100 1011
0000001001100
0000001001101
0000001110010||t t||0000001110011
0000001110100
0000001110101
0000 001110110
0000001110111
0000001010010
0000001010011
0000001010100
00000010101
0000001011010
0000001011011
0000001100100
0000001100101
000000000001
NOTE: Recognizing that there are terminals that can accommodate larger paper while retaining standard horizontal resolution, the combined base code groups appended to this table provide for this option.
Run length (white and black)
Combined stem code
Combined stem code
00000001000
00000001100
00000001101
000000010010
000000010011
000000010100
00000001 0101
000000010110
000000010111
000000011100
000000011101
000000011110
000000011111
Note: Run lengths longer than or equal to the 2624 pixel length range are first encoded with a combined stem code of 2560. If the remaining run length (after the first
2560 combined stem code) is 2560 pixels or greater, additional 2560 combined stem codes will be added until the remaining run length is less than 2560 pixels. Then, according to the above range, it is encoded with an end code or a combined backbone code plus an end code. 6
4.2 Two-dimensional coding scheme
GB/T 3382. 1--2003/ITU-T T. 4: 1996 The two-dimensional coding scheme is an optional extension of the one-dimensional coding scheme specified in Article 4.1, as described below 4.2.1 Data
4.2.1.1 Parameter K
In order to limit the interfered area when a transmission error occurs, after each one-dimensional coded scan line, at most K-1 subsequent scan lines are coded with two-dimensional coding. The number of times the one-dimensional coded scan line is transmitted may be more than the number of all K scan line groups. After a one-dimensional scan line is sent, K-1 two-dimensional scan lines are transmitted. The maximum value of K is set as follows: Standard vertical resolution: K-2; Optional high vertical resolution: K-4.
NOTE 1: Some administrations have indicated that for selected high vertical resolution, the value of K may optionally be set to a lower value. NOTE 2: Some administrations reserve the right to endorse the view that only those terminals used for fax services in their respective countries will be able to produce a visible symbol in their received fax messages to indicate that two-dimensional coding was used in the transmission process. 4.2.1.2 One-dimensional coding
The data is consistent with that described in 4.1.1.
4.2.1.3 Two-dimensional coding
This is a scan line by scan line coding method, that is, the position of each migrating pixel on the current or being encoded scan line is encoded based on the position of the corresponding reference pixel on the reference scan line located on or immediately above the scan line being encoded. When the encoding of the scan line being encoded is completed, it becomes the reference scan line for the next scan line being encoded. 4.2.1.3.1 Definition of Migration Pixels (see Figure 3) Migration Pixel: A pixel whose "color" (i.e., black or white) is different from the previous pixel on the same scan line. a. A reference pixel or starting migration pixel located on the scan line being encoded. At the beginning of the scan line being encoded, there is an imaginary white migration pixel that immediately precedes the first pixel of this scan line. When encoding this scan line being encoded, the position of a. is determined by the previous encoding mode (see 4.2.1.3.2). The next migration pixel to the right of a. on the scan line being encoded. ar
The next migration pixel to the right of a1 on the scan line being encoded. a2
The first migration pixel to the right of ao and of opposite color to ao on the reference scan line. bi
The next migration pixel to the right of b, on the reference scan line. b21
Reference scan line
Coding scan line
4.2.1.3.2 Coding mode
Figure 3 Migrated pixels
According to the coding process described in Section 4.2.1.3.3, one of the three coding modes is selected to encode the position of each migrated pixel on the scan line being encoded. Figures 4, 5 and 6 give examples of these three coding modes. br
Reference scan line
Coding scan line
Figure 4 Through mode
a) Through mode
When b2 is to the left of al, it is considered to be through mode. After completing the coding of this mode, the pixel below b2 on the scan line being encoded is set to the next encoded ao (that is, at a). However, when ba2 appears just above al, as shown in Figure 57
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