1、 STD-ITU-T RECMN T-Sb3-ENGL L99b 4Bb2591 063487b BTT m INTERNATIONAL TELECOMMUNICATION UNION lTU=T TELECOMMUNICATION STAN DARD IZATI ON SECTOR OF ITU T.563 (1 0/96) SERIES T: TERMINALS FOR TELEMATIC SERVICES Terminal characteristics for Group 4 facsimile apparatus ITU-T Recommendation T.563 (Previou
2、sly CCITT Recommendation) STD-ITU-T RECMN T.Sb3-ENGL L99b 48b259L Ob34877 73b ITU-T T-SERIES RECOMMENDATIONS TERMINALS FOR TELEMATIC SERVICES For further details, please refer to TU-T List of Recommendations. - STD-ITU-T RECMN T.Sb3-ENGL 1996 48b2591 Ob34878 b72 = FOREWORD The ITU-T (Telecommunicati
3、on Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Te
4、lecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down
5、 in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation T.563 was revised by ITU-T Study Group 8 (1993-1996) and was approved by the WTSC (Geneva, 9- 18 October 1996) NOTE In this Recommendation, the expression ?Administration? is used for conciseness to indicate both a telecomm
6、unication administration and a recognized operating agency. O ITU 1997 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. Recommendatio
7、n T.563 (10/96) 1 CONTENTS 1 General . 2 3 Scope of Recommendatipns concerning Group 4 facsimile apparatus . General characteristics of the apparatus . 3.1 Basic characteristics 3.2 Basic functions 3.3 ITU-T-standardized optional functions of Group 4 facsimile apparatus 3.4 Optional functions of Gro
8、up 4 facsimile apparatus for national standardization or private use . 3.5 Default conditions for Group 4 facsimile apparatus . 4 Communications . 4.1 Storage 4.2 Call identification 4.3 Communication application profile for Group 4 facsimile document 5 Network-related requirements 5.1 Networks . 5.
9、2 Circuit-Switched Public Data Network (CSPDN) 5.3 Packet-Switched Public Data Network (PSPDN) . 5.4 Integrated Services Digital Network (ISDN) 6 Indicators 7 Access to facsimile MHS . 8 Implementation of apparatus Annex A - Guaranteed reproducible area for Group 4 apparatus conforming to Recommenda
10、tion T.563 Annex B - Optional file transfer for Group 4 B.l 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 Protocol aspects - ASN.l definition of user data conveyed by session PDU . B.7 Communicatio
11、n concepts Appendix I - Implementation Guide of Group 4 facsimile . I . 1 Document architecture 1.2 ASN.l definition of user data conveyed by session PDU . 1.3 Communication concepts Page 1 1 2 2 2 4 6 7 7 7 7 7 8 8 8 8 8 8 8 9 9 11 11 11 11 12 12 14 16 17 17 17 22 I1 Recommendation T.563 (10/96) ST
12、D-ITU-T RECMN T-Sb3-ENGL L93b m qBb259L Ob3qBBO 220 SUMMARY This Recommendation defines the terminal characteristics for G4 facsimile apparatus. The descriptions of the terminal characteristics for colour extension are added as an option by this Recommendation. The coding schemes for colour image ty
13、pe and optional functions for colour facsimile are mainly defined. The references to the teletext service are removed. . Recommendation T.563 (10/96) 111 STD-ITU-T RECMN T.5b3-ENGL L77b 48b2591 Ob34881 Lb7 = Recommendation T.563 TERMINAL CHARACTERISTICS FOR GROUP 4 FACSIMILE APPARATUS (revised 1994
14、and 1996) The ITU-T, considering that Recommendation T.4 refers to Group 3 type apparatus for IS0 A4 document transmission over a (a) telephone-type circuit in approximately one minute; (b) assures essentially error-free reception of the documents; (c) commonality among these terminals, that there i
15、s a demand for Group 4 apparatus which incorporates means for reducing the transmission time and that telematic terminals including Group 4 facsimile apparatus are to be standardized, taking into account the unanimously declares that Group 4 facsimile apparatus as defined in Recommendation T.0 shoul
16、d be designed and operated according to the following standard. 1 General 1.1 packet-switched, and the Integrated Services Digital Network (ISDN). Group 4 facsimile apparatus is used mainly on Public Data Networks (PDN) including circuit-switched, 1.2 information essentially without transmission err
17、ors. 1.3 transmission. The procedures used with Group 4 facsimile apparatus enable it to transmit and reproduce image-coded Group 4 facsimile apparatus has the means for reducing the redundant information in facsimile signals prior to 1.4 colour image type of G4 facsimile apparatus are optional. Oth
18、er image types are for further study. The basic image type of the Group 4 facsimile apparatus is black and white. Continuous tone gray scale and NOTE - The above definitions are extracted from Study Group 1 where “terminai” is used instead of “apparatus”. 2 2.1 2.2 Scope of Recommendations concernin
19、g Group 4 facsimile apparatus This Recommendation defines the general aspects of Group 4 facsimile apparatus. The rules to be followed in the Group 4 facsimile services are defined in Recommendation F. 184. 2.3 T.81 and T.82. The Group 4 facsimile coding scheme and facsimile control functions are de
20、fined in Recommendations T.6, 2.4 Group 4 facsimile apparatus communicates with unique procedures that are described as follows: a) b) c) d) e) the interface to the physical network is defined in this Recommendation (see Note); the transport end-to-end control procedure is defined in Recommendation
21、T.70; Group 4 facsimile control procedures are defined in Recommendation T.62; Group 4 facsimile communication application profile is defined in Recommendation T.52 1 ; Group 4 facsimile document application profile is defined in Recommendation T.503. Recommendation T.563 (10/96) 1 - STD-ITU-T RECMN
22、 TAb3-ENGL 1996 = 48b2.571 Ob34882 UT3 2.5 defined in Recommendation T.42. For the continuous tone colour image, the continuous tone colour representation method for G4 facsimile is 3 General characteristics of the apparatus 3.1 Basic characteristics 3.1.1 any other subscriber. The Group 4 facsimile
23、 apparatus provides the means for direct document transmission from any subscriber to 3.1.2 at the basic levei defined in this Recommendation. Additional operational functions may be invoked. All apparatus participating in the international Group 4 facsimile service have to be compatible with each o
24、ther 3.1.3 The range of data rates is described in clause 5. Detailed arrangements on a national levei are lefi to the Administrations concerned, as it is recognized that national implementation of the Group 4 facsimile service on various types of network may involve national operation at different
25、data throughput rates. 3.1.4 formats are taken into account. The page is the basis for facsimile message formatting and transmission. Both A4 and North American paper 3.1.5 transmission. Facsimile coding schemes are applied in order to reduce the redundant information in facsimile signais prior to 3
26、.1.6 facsimile messages must be identical at the transmitting and receiving apparatus. The apparatus must have the ability to reproduce facsimile messages. The content, layer and format of 3.1.7 The reproducible area is defined within which facsimile messages are assured to be reproduced. (See 3.2.6
27、.) 3.1.8 The Group 4 facsimile apparatus should provide means for automatic reception. 3.1.9 Group 4 facsimile apparatus shall incorporate the functions defined as basic for the Group 4 facsimile service in 3.2 below. In addition, optional functions can be incorporated. In this Recommendation, the o
28、ptional functions are divided into ITU-T standardized options and nationally and/or privately specified options. 3.2 Basic functions 3.2.1 Group 4 facsimile apparatus shall be capable of handling: a) b) c) d) communication application profile as defined in Recommendation T.52 1; document application
29、 profile as defined in Recommendation T.503; the basic facsimile coding scheme as defined in Recommendation T.6; the control function associated with the basic facsimile coding scheme as defined in Recommen- dation T.6. 3.2.2 Group 4 apparatus shall have the following provisions for facsimile messag
30、es: a) provision for scanning the documents to be transmitted (see 3.2.5); b) provision for receiving and presenting hard or soft copies of the documents. 3.2.3 Basic page formatting functions are as follows: a) vertical page orientation; b) paper size of IS0 A4; e) reproducible aredprintable area i
31、s defined, taking into account IS0 A4 and North American paper formats and IS0 standard 3535. 2 Recommendation T.563 (1 0196) 3.2.4 Terminal identification Resolution (peld25.4 mm) Each Group 4 facsimile apparatus should be equipped with a unique identification. Details of the identification are giv
32、en in Recommendation F. 184. Horizontal and vertical tolerance (%) 3.2.5 Scanning The message area should be scanned in the same direction in the transmitter and receiver. Viewing the message area in a vertical plane, the picture elements shall be processed as if the scanning direction were from lef
33、t to right with subsequent scans adjacent to and below the previous scan. 3.2.6 Page size and reproducible area 3.2.6.1 Sometimes paper length may not be specified, because the paper end is detected by paper scanning. 3.2.6.2 The size of the guaranteed reproducible area for IS0 A4 paper size is show
34、n in Annex A. 3.2.7 Group 4 facsimile transmission pel density (resolution) requirements The Group 4 facsimile resolution requirements and their tolerances are given in Table 1. Standard pel transmission density for Group 4 facsimile is 200 peld25.4 mm. Table 1f.563 200 x 200 240 x 240 300 x 300 400
35、 x 400 Lower resolution for continuous tone gray scale and colour image is for further study. Centre line referencing will be used for paper positioning. Each page will be positioned on the scanner so that the centre line is in registration with the value: (number of pels/line)/2. (For further study
36、.) Specific values for the number of pels per line, scan line length and nominal number of scan lines per page are given in Tables 2a and 2b for all the Group 4 resolutions for IS0 A4, North American Letter, IS0 B4, IS0 A3, Japanese Legal, Japanese Letter, North American Legal and North American Led
37、ger paper. Table 3 specifies the blanking procedure for all of the Group 4 paper sizes. An equal number of pels on the left and right side of the page are set to white to fit the paper format. Figure 1 illustrates the blanking procedure for IS0 A4 and North American Letter paper. The same procedure
38、is used for the other paper formats. The raster point in the upper left corner of an IS0 page is used as a reference for portrait mode character printing. This raster point, termed the raster reference point (1.1), is used as a starting point for determining character margins and positions. This is
39、also illustrated in Figure 1. 3.2.8 Facsimile coding schemes 3.2.8.1 In order to reduce the redundant information in facsimile signals, the basic facsimile coding scheme is defined in Recommendation T.6. This coding scheme is used assuming that transmission errors are corrected by control I procedur
40、es in lower levels. Recommendation T.563 (10196) 3 3.2.8.2 On an optional basis, an apparatus can use other ITU-T standardized coding schemes defined in Recommendation T.6 or T.85. North Letter American IS0 B4 1728 2048 2074 2458 2592 3072 3456 4096 3.2.8.3 When the encoded bit string based on Recom
41、mendation T.6 is arranged in the octet string of ASN.l, the first bit of encoded image should be placed in LSB of octet. The successive bits are placed in the direction of LSB to MSB of octet. 219.46 I 260.10 3.2.8.4 For colour facsimile of continuous tone image as described in 3.3.5 b) with more th
42、an one colour component, the coding scheme defined in Recommendation T.81 shall be used and the coding scheme defined in Recom- mendation T.82 is for further study. For colour facsimile of multi-colour image, the coding scheme defined in Recommendation T.82 is applicable. The colour facsimile of mul
43、ti-colour is reserved for further study. 1 215.9 I 250 3.3 ITU-T-standardized optional functions of Group 4 facsimile apparatus I I 3.3.1 communication application profile (see Recommendation T.52 I). The possibility of using optional functions can be negotiated during a handshaking procedure in the
44、 I I I I I I 3.3.2 The optional functions are invoked by the communication application profile (see Recommendation T.52 1). 1 11.86 I 3.10 I -37.46 7 3.56 I-P 29.46 I Table 2a.563 - Number of pels and scan line length for different paper sizes 2048 2458 3072 4096 Resolution elements a scan line alon
45、g 240 300 400 Scan line length (mm) (P) 1728 2074 2592 3456 Paper width (mm) (Q) 10 3 P-O North North Legal Ledger Japanese Japanese Letter American American Legai IS0 A4 Per Page for each pel- transmission density 1728 2074 1 2592 1 3456 200 240 300 400 219.46 2866 3439 4299 5732 210 2024 2800 3400
46、 2428 3360 4080 3035 4200 5100 4047 5600 6800 i Nominal paper length (mm) 297 279.4 353 I 3.56 I 10.10 2432 2918 3648 4864 308.86 260.10 I -219.46- 2592 3456 4864 219.46 308.86 297 I 257 I 182 I 215.9 I 279.4 I Table 2bm.563 - Nominal number of scan lines for different paper sizes number (pels/ IS0
47、A4 2339 2806 3508 4677 North Letter 2640 3335 3300 4169 4400 5559 4 Recommendation T.563 (10/96) 3307 3969 496 1 6614 420 I 364 I 257 I 355.6 I 431.8 STD-ITU-T RECMN T.Sb3-ENGL 197b i8b2.571 Ob3Li885 802 D Table 3lT.563 - Blanking and address reference point for different paper sizes 37 45 56 74 (BI
48、 (38.1) 2 19.46 (46.1) 2 19.46 (57.1) 2 19.46 (75.1) 2 19.46 IS0 B4 IS0 A3 200 x 200 2048 1968 240 x 240 2458 2362 300 x 300 3072 2952 400 x 400 4096 3936 200 x 200 2432 2338 240 x 240 2918 2806 300 x 300 3648 3508 400 x 400 4864 4676 2048 2458 3072 4096 2024 2428 3036 4048 12 I5 18 24 147 177 22 1
49、294 (13.1) 260.10 (16.1) 260.10 (19.1) 260.10 (25.1) 260.10 (148.1) 219.46 (178.1) 219.46 (222.1) 219.46 (295.1) 2 19.46 1728 2074 2592 3456 1700 2040 2550 3400 14 17 21 28 (15.1) 219.46 (18.1) 219.46 (22.1) 219.46 (29.1) 2 19.46 Total line Reference margin I point I length Blanking (PW (mm) SO A4 1728 2074 2592 3456 200 x 200 240 x 240 300 x 300 400 x 400 200 x 200 240 x 240 300 x 300 400 x 400 1654 1984 2480 3308 1700 2040 2550 3400 North American Letter (A) 14 17 21 28 1728 2074 2592 3456 (15.1) (18.1) (22.1) (29.1) 219.46 2 19.46 219.46 219.46 40 48
