ITU-T T 561-1988 TERMINAL CHARACTERISTICS FOR MIXED MODE OF OPERATION MM《混合型操作MM的终端特性》.pdf

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1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 4 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU4%2-).!,G0G0%15)0-%.4G0G0!.$G0G002/4/#/,3G0G0(b) that these applications, in some cases, can be conveniently combined into one single terminal to giveimproved performance to the users of these terminals;(c) t

2、hat standardization work has been aiming at common protocols and compatible parameters for variousequipments and procedures;(d) that teletex and Group 4 facsimile seem particularly suited to form a common service where required;(e) that other services already defined or under study could be incorpor

3、ated,unanimously declaresthat mixed mode characteristics should be designed and operated in accordance with the following standards.1 Scope1.1 The international teletex service requirements to the mixed mode of operation MM.1 are defined inRecommendation F.230.1.2 the service requirements for Group

4、4 facsimile service related to the mixed mode of operation MM.1 aredefined in Recommendation F.161.1.3 This Recommendation defines terminal characteristics unique to the rnixed mode of operation MM.1.2 Fascicle VII.7 - Rec. T.5612 Field of applicationThis Recommendation applies to terminal equipment

5、 of the teletex service or the Group 4 facsimile servicesupporting the mixed mode of operation MM.1.3 ReferencesThe following CCITT Recommendations also apply to equipments for mixed mode of operations: Rec. T.6: “Facsimile coding schemes and coding control functions for Group 4 facsimile apparatus“

6、; Rec. T.60: “Terminal equipment for use in teletex service“; Rec. T.61: “Character repertoire and coded character sets for the international teletex service“; Rec. T.62: “Control procedures for the teletex and Group 4 facsimile services“; Rec. T.70: “Network-independent basic transport service for

7、telematic services“; Rec. T.400 Series: “Document architecture transfer and manipulation“; Rec. T.501: “A document application profile MM for the interchange of formatted mixed modedocuments“; Rec. T.522: “Communication application profile BT1 for document bulk transfer“; Rec. T.563: Terminal charac

8、teristics for Group 4 facsimile apparatus“.4 DefinitionsTerms and their definitions are defined by Recommendation listed above.5 General characteristics of the equipment5.1 General5.1.1 Equipments supporting mixed mode of operation MM.1 shall provide a set of basic features. The ability toprovide th

9、is minimum set of basic features is indicated and negotiated before the document interchange.5.1.2 These equipments may in addition to the set of basic features provide other facilities. These facilities arenegotiated separately from the set of basic features defined below.5.2 Basic features require

10、d for equipments supporting mixed mode MM.1The basic features required for equipments supporting mixed mode of operation are:5.2.1 The ability to create, transmit and receive documents conforming to the document application profile MM.1defined in Recommendation T.501;5.2.2 The ability to interchange

11、 documents by using the application context defined in 7.1 of this Recommendation;5.2.3 The ability to handle the ISO A4 nominal page defined in 6.1.1.3 and to provide, at least, the assuredreproduction area which is defined for ISO A4 paper size in 6.1.1.4.5.2.4 The ability to receive and present d

12、ocuments, composed of:a) one (or more) page(s) containing only content belonging to the teletex basic repertoire ofRecommendation T.61;b) one (or more) page(s) containing only content encoded by the raster graphics coding scheme defined inRecommendation T.6;c) one (or more) page(s) containing conten

13、t encoded as per a) and b);d) any combination of pages defined in a), b) and c).5.2.5 For characters and raster graphics content, the ability to handle the basic features defined byRecommendation T.501.5.2.6 The ability to create blocks of different sizes which can overlap within the page.5.2.7 The

14、ability to process up to 31 received blocks for presentation as a single page, without using negotiation.5.2.8 The ability to handle the call identification line information (see 6.1.2).Fascicle VII.7 - Rec. T.561 35.3 Non-basic features for mixed modeOne or more additional features listed in this s

15、ection may be provided by a terminal supporting mixed mode.These features have to be negotiated before the interchange of the mixed mode document.5.3.1 The ability to handle the nominal page and to provide, at least, the assured reproduction area which are definedfor North American letter paper size

16、, ISO A3 paper size, Japanese legal and Japanese letter paper sizes (see 6.1.1.3and 6.1.1.4).5.3.2 The ability to process more than 31 received blocks for presentation as a single page;5.3.3 The ability to negotiate additional presentation characteristics for particular blocks of the document forcha

17、racter and raster graphics content. These non-basic characteristics are specified in Recommendation T.501.6 Document handling6.1 Requirements for the imaging process6.1.1 Dimensions for text presentation6.1.1.1 Basic measurement unit (BMU)The size of the basic measurement unit (BMU) is 1/1200 x 25.4

18、 mm if the output medium is paper and thelocally defined scaling factor is one. To avoid introducing positioning errors between the mandatory image resolutions,it is preferred that the positioning of layout objects to specified in multiples of 20 BMU.6.1.1.2 Paper sizeDifferent physical paper sizes

19、can be used for presentation of mixed mode information. Such paper sizes areISO A4 paper size (210 297 mm), North American letter paper size (215.9 279.4 mm), ISO A3 paper size(297 420 mm), Japanese legal paper size (257 364 mm) and Japanese letter paper size (182 257 mm).6.1.1.3 Pages and nominal p

20、agesAs defined in Recommendation T.412, a page is a rectangular area used as the reference area for positioningand imaging the content of the document. The page is intended to be positioned and imaged on a unit of thepresentation surface. The ideal size of the presentation surface, as assumed by the

21、 sender of a document is the nominalpage. This nominal page is equal to the ideal paper sized used (see below). In this Recommendation, the page may beequal to or smaller than the nominal page of the corresponding physical paper format.The following nominal page are defined, showing the maximum allo

22、wed dimensions of “page“ layout objects:a) nominal page for the ISO A4 paper size: width 9 920 BMU (210 mm); height 14 030 BMU (297 mm);b) optional nominal page for the North American letter paper size: width 10 200 BMU (215.9 mm); height 13 200 BMU (279.4 mm);c) optional nominal page for the ISO A3

23、 paper size: width 14 030 BMU (297 mm); height 19 840 BMU (420 mm);d) optional nominal page for Japanese legal paper size: width 12 141 BMU (257 mm); height 17 196 BMU (364 mm);e) optional nominal page for Japanese letter paper size: width 8 598 BMU (182 mm); height 12 141 BMU (257 mm).The pages def

24、ined above describe the presentation of text information on the specified paper sizes in both thevertical and horizontal image orientations.4 Fascicle VII.7 - Rec. T.5616.1.1.4 Assured reproduction areaHard-copy devices must allow for the possibility of edge losses cause, for example by the optional

25、 printing of acall identification line at the receiver, by tolerances on the physical paper size, and by equipment tolerances (see AnnexA of Recommendation T.60). In order to cater for these edge losses, an assured reproduction area is defined which isthe rectangular area that remains one the nomina

26、l page after deducting an agreed allowance for edge losses.For the option of printing a call identification line, an area at the top of the page is reserved. The same area isused for both vertical and horizontal image orientations, If used, the call identification line is to be printed on thesecond

27、character baseline which is 400 BMU (8.466 mm) from the X-axis. The reserved area consists of 72 charactersboxes, each 120 BMU in width and 200 BMU in height, starting at 945 BMU (20 mm) from the Y-axis and extendingfor 8640 BMU. The maximum permitted character baseline offset of these character box

28、es is 72 BMU, so that the areaof assured reproduction starts at 472 BMU (10 mm) from the X-axis. Any interchanged text in the area of thesecharacter boxes may be suppressed, to avoid obscuring the image of the call identification line.The assured reproduction areas are defined as follows:a) ISO A4 a

29、ssured reproduction area: width = 9 240 BMU; height = 13 200 BMU; top margin = 472 BMU; left margin = 345 BMU;b) North American letter assured reproduction area: width = 9 240 BMU; height = 12 400 BMU; top margin = 472 BMU; left margin = 345 BMU;c) ISO A3 assured reproduction area: width = 13 200 BM

30、U; height = 18 480 BMU; top margin = 472 BMU; left margin = 345 BMU;d) Japanese legal assured reproduction area: width = 11 200 BMU; height = 15 300 BMU; top margin = 900 BMU; left margin = 400 BMU;e) Japanese letter assured reproduction area: width = 7 600 BMU; height = 10 200 BMU; top margin = 900

31、 BMU; left margin = 400 BMU.The assured reproduction areas for ISO A4, North American letter, ISO A3, Japanese legal and Japanese letterpaper sizes are illustrated in Figure I/T.561, Figure 2/T.561, Figure 3/T.561, Figure 4/T.561 and Figure 5/T.561respectively, showing the maximum edge losses on eac

32、h paper edge. The indicated edge losses are based on theidealized or nominal paper sizes as defined in 6.1.1.2 and do not take account of paper size tolerances.Raster graphics image parameters, for the image dimensions mentioned in Figures 1/T.561 and 2/T.561 areshown for reference in Table 1/T.561.

33、Fascicle VII.7 - Rec. T.561 5 6 Fascicle VII.7 - Rec. T.561 Fascicle VII.7 - Rec. T.561 7TABLE 1/T.561Parameters for raster graphics images with dimensions equal to thedimensions shown in Figures 1/T.561 and 2/T.561(For reference only)Image dimensionsNumber of pels per lineat various image resolutio

34、nsBMU mm180pels/25.4 mm200pels/25.4 mm240pels/25.4 mm300pels/25.4 mm400pels/25.4 mm9 920 210.0 1488 1654 1984 2480 33089 240 195.6 1386 1540 1848 2310 308010 200 215.9 1530 1700 2040 2550 3400Number of raster graphics lines at variousimage resolutions14 030 297.0 2104 2339 2806 3508 467713 200 279.4

35、 1980 2200 2640 3300 440012 400 262.5 1860 2067 2480 3100 41336.1.1.5 Positioning of the page relative to the nominal pageThe rules defined in Recommendation T.412, 7.3.2 apply.6.1.2 Call identification line (CIL)6.1.2.1 The basic CIL presentation rules as defined in Recommendation F.200 should appl

36、y.6.1.2.2 For printing CIL, an area, as defined in 6.1.1.4 is provided.8 Fascicle VII.7 - Rec. T.5616.1.3 Fall-back techniquesSome basic and non-basic features described in Recommendation T.501 are allowed to be approximated usingfall-back techniques.This paragraph determines the fall-back procedure

37、 which may be used by the recipient if features present in theinterchanged document are not locally available.The table below identifies the features for which fall-back procedure may be used. All other features, not listedin this table, must not be approximated.Features Fall-backBold Italicized or

38、underlinedItalicized Bold or underlined6.2 Requirements for the formatting processNot applicable.7 Communication aspects7.1 Application context for interchange of MM documents7.1.1 Application context nameThe value of the “application context name“ parameter is the following object identifier value:

39、0 0 20 561 0.7.1.2 Use of application service elements7.1.2.1 Use of DTAM servicesThe DTAM service element (DTAMSE) is described in Recommendation T.432. For this application context,the use of DTAMSE is defined in Recommendation T.522.Specific parameter values to be used in the D-INITIATE service p

40、arameter are: the parameter value to represent the document application profile for mixed mode MM, defined inRecommendation T.501, is the object identifier value: 0 0 20 501 0. the parameter value to represent the document application profile for processable mode PM.1, defined inRecommendation T.502

41、, is the object identifier value: 0 0 20 502 0.7.1.2.2 Use of association control service element (ACSE)The ACSE is described in Recommendation X.217. For this application context, DTAMSE is the sole user ofthe ACSE services.Note - The use of reliable transfer service element (RTSE) is for further s

42、tudy.7.1.3 Use of presentation serviceThe presentation service is defined in Recommendation X.216. The ACSE is the sole user of theP-CONNECT, P-RELEASE, P-U-ABORT and P-P-ABORT services of the presentation service. For this applicationcontext, DTAMSE is the sole user of the other presentation servic

43、es required for using the session functional unitsspecified in 7.1.4.7.1.4 Use of session serviceThe following session functional units are mandatory: kernel; half duplex; capability data exchange; minor synchronization;Fascicle VII.7 - Rec. T.561 9 exceptions; activity management.Note - When the se

44、nder cannot know before the communication the nature of the receiver(Recommendation T.62 based or Recommendation X.200 based equipment), it is requested, for an interim period, thatthe service identifier“ parameter be present in the CONNECT SPDU.7.1.5 Use of transport serviceThe transport service is

45、 described in Recommendation X.214. The protocol shall be in accordance withRecommendation X.224, Class 0.Note - When the sender cannot know before the communication the nature of the receiver(Recommendation T.62 or Recommendation X.200 based equipment), it is requested, for an interim period, thata

46、dditional rules in accordance with Recommendation T.70, 5, including Annexes A and B1), be applied in addition toRecommendations X.214/X.224.7.2 Coding schemes available7.2.1 Recommendation T.61 defines the coding scheme to be used for character coded text.7.2.2 Recommendation T.6 defines the coding

47、 techniques to be used for raster graphics.7.3 Pel spacing for raster graphics content7.3.1 Equipments must provide the capability to receive raster graphics content using pel spacings of 4 and 5 BMUwhich correspond respectively to pel transmission densities of 300 and 240 pels per 25.4 mm in both h

48、orizontal andvertical directions.7.3.2 Optional pel spacing may be negotiated (see 5.3).7.4 Orientation of mixed-mode page for transmissionThe intended viewing orientation of mixed-mode pages may be either vertical or horizontal. For thetransmission of the page the orientation shall be vertical.7.5

49、Receiving capabilities7.5.1 The negotiation of the storage capacity is mandatory for equipments providing mixed mode of operation.8 Interworking between basic teletex equipments and teletex equipments support MM and/or PM.18.1 GeneralFor teletex equipments supporting MM and/or PM.1: basic teletex documents are to be interchanged according to the