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T.561 y   Recommendation T.561  TERMINAL CHARACTERISTICS FOR MIXED MODE OF OPERATION MM ă * * * &CONTENTS 1HScope  2HField of application  3HReferences  4HDefinitions  5HGeneral characteristics of the equipment  6HDocument handling  7HCommunication aspects   8HHInterworking between basic teletex equipments and teletex equipments supporting MM and/or PM.1'H HThe CCITT, considering  H(a)  that telematic services have been defined or are going to be defined for a number of applications;   H(b)  that these applications, in some cases, can be conveniently combined into one single terminal to give improved performance to the users of these terminals;   H(c)  that standardization work has been aiming at common protocols and compatible parameters for various equipments and procedures;   H(d)  that teletex and Group 4 facsimile seem particularly suited to form a common service where required;  H(e)  that other services already defined or under study could be incorporated, unanimously declares  Hthat mixed mode characteristics should be designed and operated in accordance with the following standards. 1 H Scope  1.1HThe international teletex service requirements to the mixed mode of operation MM.1 are defined in RecommendationF.230.  1.2Hthe service requirements for Group 4 facsimile service related to the mixed mode of operation MM.1 are defined in RecommendationF.161.  1.3HThis Recommendation defines terminal characteristics unique to the mixed mode of operation MM.1. 2 H Field of application  HThis Recommendation applies to terminal equipment of the teletex service or the Group4 facsimile service supporting the mixed mode of operationMM.1. 3 H References  HThe following CCITT Recommendations also apply to equipments for mixed mode of operations:  H Rec. T.6: "Facsimile coding schemes and coding control functions for Group 4 facsimile apparatus";'  H Rec. T.60: "Terminal equipment for use in teletex service";'   H Rec.T.61: "Character repertoire and coded character sets for the international teletex service";'   H Rec.T.62: "Control procedures for the teletex and Group 4 facsimile services";'   H Rec. T.70: "Networkindependent basic transport service for telematic services";'  H Rec. T.400 Series: "Document architecture transfer and manipulation";'   H Rec. T.501: "A document application profile MM for the interchange of formatted mixed mode documents";'   H Rec. T.522: "Communication application profile BT1 for document bulk transfer";'  HH©X Rec. T.563: "Terminal characteristics for Group 4 facsimile apparatus".' 4 H Definitions HTerms and their definitions are defined by Recommendation listed above. x% 5 H General characteristics of the equipment 5.1HGeneral   5.1.1HEquipments supporting mixed mode of operation MM.1 shall provide a set of basic features. The ability to provide this minimum set of basic features is indicated and negotiated before the document interchange.   5.1.2HThese equipments may in addition to the set of basic features provide other facilities. These facilities are negotiated separately from the set of basic features defined below. 5.2HHBasic features required for equipments supporting mixed mode MM.1'H   HThe basic features required for equipments supporting mixed mode of operation are:   5.2.1HThe ability to create, transmit and receive documents conforming to the document application profile MM.1 defined in RecommendationT.501;   5.2.2HThe ability to interchange documents by using the application context defined in  7.1 of this Recommendation;   5.2.3HThe ability to handle the ISO A4 nominal page defined in 6.1.1.3 and to provide, at least, the assured reproduction area which is defined for ISO A4 paper size in 6.1.1.4.  5.2.4HThe ability to receive and present documents, composed of:   Ha)  one (or more) page(s) containing only content belonging to the teletex basic repertoire of RecommendationT.61;'   HHb)X  one (or more) page(s) containing only content encoded by the raster graphics coding scheme defined in RecommendationT.6;'  HHc)X  one (or more) page(s) containing content encoded as per a) and b);' HHd)X  any combination of pages defined in a), b) and c).'   5.2.5HFor characters and raster graphics content, the ability to handle the basic features defined by RecommendationT.501.   5.2.6HThe ability to create blocks of different sizes which can overlap within the page.   5.2.7HThe ability to process up to 31 received blocks for presentation as a single page, without using negotiation.  5.2.8HThe ability to handle the call identification line information (see 6.1.2).  5.3HNonbasic features for mixed mode   HOne or more additional features listed in this section may be provided by a terminal supporting mixed mode. These features have to be negotiated before the interchange of the mixed mode document.   5.3.1HThe ability to handle the nominal page and to provide, at least, the assured reproduction area which are defined for North American letter paper size, ISO A3 paper size, Japanese legal and Japanese letter paper sizes (see 6.1.1.3 and 6.1.1.4).   5.3.2HThe ability to process more than 31 received blocks for presentation as a single page;   5.3.3HThe ability to negotiate additional presentation characteristics for particular blocks of the document for character and raster graphics content. These nonbasic characteristics are specified in RecommendationT.501. 6 H Document handling 6.1HRequirements for the imaging process  6.1.1HDimensions for text presentation  6.1.1.1HBasic measurement unit (BMU)   HThe size of the basic measurement unit (BMU) is 1/1200-25.4mm if the output medium is paper and the locally 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 20BMU. & 6.1.1.2HPaper size  HDifferent physical paper sizes can be used for presentation of mixed mode information. Such paper sizes are ISO A4 paper size (210-297mm), North American letter paper size (215.9-279.4mm), ISO A3 paper size (297-420mm), Japanese legal paper size (257-364mm) and Japanese letter paper size (182-257mm). 6.1.1.3HPages and nominal pages  HAs defined in RecommendationT.412, a page is a rectangular area used as the reference area for positioning and imaging the content of the document. The page is intended to be positioned and imaged on a unit of the presentation surface. The ideal size of the presentation surface, as assumed by the sender of a document is the nominal page. This nominal page is equal to the ideal paper sized used (see below). In this Recommendation, the page may be equal to or smaller than the nominal page of the corresponding physical paper format.  HThe following nominal page are defined, showing the maximum allowed dimensions of "page" layout objects: HP ")x-HP 0 ")x-HHa)X  nominal page for the ISO A4 paper size:' HHX ©X widthP  9920 BMU (210mm);' HHX ©X heightP 14030 BMU (297 mm);' HHb)X  optional nominal page for the North American letter paper size:' H  widthP 10200 BMU (215.9 mm);' HHX ©X heightP 13200 BMU (279.4 mm); ' Hc)  optional nominal page for the ISO A3 paper size: HHX ©X widthP 14030 BMU (297 mm);' HHX ©X heightP 19840 BMU (420 mm);' HHd)X  optional nominal page for Japanese legal paper size:' HHX ©X widthP 12141 BMU (257 mm);' HHX ©X heightP 17196 BMU (364 mm);' HHe)X  optional nominal page for Japanese letter paper size:' HHX ©X widthP  8598 BMU (182 mm);' HHX ©X heightP 12141 BMU (257 mm).'  HP 0 ")x-HP ")x-HThe pages defined above describe the presentation of text information on the specified paper sizes in both the vertical and horizontal image orientations. 6.1.1.4HAssured reproduction area  HHardcopy devices must allow for the possibility of edge losses cause, for example by the optional printing of a call identification line at the receiver, by tolerances on the physical paper size, and by equipment tolerances (see Annex A of Recommendation T.60). In order to cater for these edge losses, an assured reproduction area is defined which is the rectangular area that remains one the nominal page after deducting an agreed allowance for edge losses.   HFor the option of printing a call identification line, an area at the top of the page is reserved. The same area is used for both vertical and horizontal image orientations, If used, the call identification line is to be printed on the second character baseline which is 400BMU (8.466mm) from the Xaxis. The reserved area consists of 72 characters boxes, each 120BMU in width and 200BMU in height, starting at 945BMU (20 mm) from the Yaxis and extending for 8640BMU. The maximum permitted character baseline offset of these character boxes is 72BMU, so that the area of assured reproduction starts at 472BMU (10mm) from the Xaxis. Any interchanged text in the area of these character boxes may be suppressed, to avoid obscuring the image of the call identification line. & HThe assured reproduction areas are defined as follows:  HP ")x-HP XH8")x-Ha)  ISO A4 assured reproduction area:  H widthP =""$9240BMU; H heightP ="13200BMU; H top margin"=#$$X%%&&H'472BMU; H left margin"=#$$X%%&&H'345BMU;  HHb)X  North American letter assured reproduction area:'  H widthP =""$9240BMU; H heightP ="12400BMU; H top margin"=#$$X%%&&H'472BMU; H left margin"=#$$X%%&&H'345BMU;  Hc)  ISO A3 assured reproduction area:  H widthP ="13200BMU; H heightP ="18480BMU; H top margin"=#$$X%%&&H'472BMU; H left margin"=#$$X%%&&H'345BMU;  Hd)  Japanese legal assured reproduction area:  H widthP ="11200BMU; H heightP ="15300BMU; H top margin"=#$$X%%&&H'900BMU; H left margin"=#$$X%%&&H'400BMU;  He)  Japanese letter assured reproduction area:  H widthP =""$7600BMU; H heightP ="10200BMU; H top margin"=#$$X%%&&H'900BMU; H left margin"=#$$X%%&&H'400BMU.   HP XH8")x-HP ")x-HThe assured reproduction areas for ISO A4, North American letter, ISO A3, Japanese legal and Japanese letter paper sizes are illustrated in Figure1/T.561, Figure2/T.561, Figure3/T.561, Figure4/T.561 and Figure5/T.561 respectively, showing the maximum edge losses on each paper edge. The indicated edge losses are based on the idealized or nominal paper sizes as defined in 6.1.1.2 and do not take account of paper size tolerances.   HRaster graphics image parameters, for the image dimensions mentioned in Figures1/T.561 and2/T.561 are shown for reference in Table 1/T.561.   HHX Note These edge margin values are shown for reference only and do not take account of tolerances on either paper sizes or insertion angles.'  HHX ' HHX #FIGURE1/T.561' HHX *' HHX  Nominal page and assured reproduction area for ISO A4 paper size ă' @ HHX ' HHX ' HHX '  HHX Note The indicated size and location of the assured reproduction area accommodates ISO 3535forms UN/ECE trade documents, and the printed line lengths of the basic teletex service (i.e. 77characters at 10characters per 25.4mm) for the ISO A4 paper size. For the North American letter paper size, it also accommodates ISO 3535 forms and UN/ECE trade documents, as used for that paper size.'  HHX ' HHX #FIGURE2/T.561' HHX *'  HHX  Nominal page and assured reproduction area for the North American letter paper size ă' HHX ' HHX ' HHX ' HHX ' HHX ' HHX ' HHX ' HHX #FIGURE3/T.561' HHX *' HHX  Nominal page and assured reproduction area for ISO A3 paper size ă' p HHX ' HHX ' HHX ' HHX ' HHX ' HHX ' HHX #FIGURE 4/T.561' HHX *' HHX  Nominal page and assured reproduction area for Japanese legal paper size ă' HHX ' HHX ' HHX ' HHX ' HHX ' HHX ' HHX ' HHX ' HHX *' HHX *' HHX *' HHX #FIGURE5/T.561' HHX *' HHX  Nominal page and assured reproduction area for Japanese letter paper size ă' HHX *'  $TABLE 1/T.561 HHX *' HHX  Parameters for raster graphics images with dimensions equal to the ă' HHX  dimensions shown in Figures1/T.561 and 2/T.561 ă' HHX *' HHX  (For reference only)' HHX *'  HHX  x|@ w' Q  HHX   '  HHX   Image dimensions  Number of pels per line '  HHX    at various image resolutions ' HHX '  HHX     180  200  240  300  400 '  HHX   BMU  mm  pels/  pels/  pels/  pels/  pels/ '  HHX     25.4 mm  25.4 mm  25.4 mm  25.4 mm  25.4 mm ' HHX  '  HHX   9 920  210.0  1488  1654  1984  2480  3308 '  HHX         '  HHX   9 240  195.6  1386  1540  1848  2310  3080 '  HHX         '  HHX   10 200  215.9  1530  1700  2040  2550  3400 ' HHX '  HHX     Number of raster graphics lines at various '  HHX     image resolutions ' HHX '  HHX   14 030  297.0  2104  2339  2806  3508  4677 '  HHX         '  HHX   13 200  279.4  1980  2200  2640  3300  4400 '  HHX         '  HHX   12 400  262.5  1860  2067  2480  3100  4133 ' HHX   '  HP ")x-Xp"% 6.1.1.5 Positioning of the page relative to the nominal page XThe rules defined in RecommendationT.412, 7.3.2 apply. 6.1.2XCall identification line (CIL)  6.1.2.1 The basic CIL presentation rules as defined in Recommendation F.200 should apply. 6.1.2.2 For printing CIL, an area, as defined in 6.1.1.4 is provided. 6.1.3XFallback techniques  XSome basic and nonbasic features described in Recommendation T.501 are allowed to be approximated using fallback techniques.  XThis paragraph determines the fallback procedure which may be used by the recipient if features present in the interchanged document are not locally available.  XThe table below identifies the features for which fallback procedure may be used. All other features, not listed in this table, must not be approximated.   w      Features  Fallback     Bold  Italicized or underlined        Italicized  Bold or underlined        w. 6.2XRequirements for the formatting process XNot applicable. 7 X Communication aspects 7.1XApplication context for interchange of MM documents 7.1.1XApplication context name  XThe value of the "application context name" parameter is the following object identifier value: {0 0 20 561 0}. 7.1.2XUse of application service elements 7.1.2.1 Use of DTAM services  XThe DTAM service element (DTAMSE) is described in Recommendation T.432. For this application context, the use of DTAMSE is defined in RecommendationT.522. XSpecific parameter values to be used in the DINITIATE service parameter are:  XX©X the parameter value to represent the document application profile for mixed mode MM, defined in Recommendation T.501, is the object identifier value: {0 0 20 501 0}.'    XX©X the parameter value to represent the document application profile for processable modePM.1, defined in RecommendationT.502, is the object identifier value: {00205020}.'   7.1.2.2 Use of association control service element (ACSE)&  XThe ACSE is described in Recommendation X.217. For this application context, DTAMSE is the sole user of the ACSE services.  XNote The use of reliable transfer service element (RTSE) is for further study. 7.1.3XUse of presentation service  XThe presentation service is defined in Recommendation X.216. The ACSE is the sole user of the PCONNECT, PRELEASE, PUABORT and PPABORT services of the presentation service. For this application context, DTAMSE is the sole user of the other presentation services required for using the session functional units specified in  7.1.4. 7.1.4XUse of session service XThe following session functional units are mandatory: X kernel; X half duplex; X capability data exchange; X minor synchronization; X exceptions; X activity management.   XNote When the sender cannot know before the communication the nature of the receiver (RecommendationT.62 based or Recommendation X.200 based equipment), it is requested, for an interim period, that the "service identifier" parameter be present in the CONNECT SPDU. 7.1.5XUse of transport service  XThe transport service is described in Recommendation X.214. The protocol shall be in accordance with RecommendationX.224, Class 0. /   XNote 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, that additional rules in accordance with Recommendation T.70, 5, including Annexes A andB 1), be applied in addition to Recommendations X.214/X.224. 7.2XCoding schemes available  7.2.1XRecommendationT.61 defines the coding scheme to be used for character coded text.  7.2.2XRecommendationT.6 defines the coding techniques to be used for raster graphics. 7.3XXPel spacing for raster graphics content'X  7.3.1XEquipments must provide the capability to receive raster graphics content using pel spacings of 4 and 5 BMU which correspond respectively to pel transmission densities of 300 and 240 pels per 25.4mm in both horizontal and vertical directions. 7.3.2XOptional pel spacing may be negotiated (see 5.3). 7.4XOrientation of mixedmode page for transmission  XThe intended viewing orientation of mixedmode pages may be either vertical or horizontal. For the transmission of the page the orientation shall be vertical. 7.5XReceiving capabilities  7.5.1XThe negotiation of the storage capacity is mandatory for equipments providing mixed mode of operation.   8 XX Interworking between basic teletex equipments and teletex equipments support MM and/or PM.1 'X 8.1XGeneral XFor teletex equipments supporting MM and/or PM.1:  XX©X basic teletex documents are to be interchanged according to the rules defined in Recommendation T.62bis;'    XX©X PM.1 and MM teletex documents are to be interchanged according to the application context defined in Recommendations T.561 and T.562.'    XFigure 6/T.561 below illustrates the two different sets of rules to be used by teletex equipments depending on the interchanged document format. f!   Note Recommendation T.70bis has to be specified in the future. #FIGURE 6/T.561 *  Illustration of the communication rules to be used ă  by teletex equipment supporting PM.1 and/or MM ă 8.2XInterworking rules  8.2.1XThe basic teletex equipment is the sender   XThe only type of document that can be sent by the basic teletex equipment is the basic teletex document. The sender will therefore send this type of document by using Recommendations T.62 andT.70.   XIn order to accept the reception of the basic teletex document, the receiver has to recognize the "nature" of the originator and to select the adequate rules. For this purpose, when receiving CONNECT SPDU (which corresponds to the CSS command of Recommendation T.62), the recipient must detect the absence of session user data (SUD) and select the T.62bis module to accept the interchanged document [case a)].  8.2.2XThe PM.1 and/or MM teletex equipment is the sender 8.2.2.1 The recipient is a basic teletex equipment   XIf the document type to be transmitted is a basic teletex document, the sender will initiate the communication by selecting case a) and the basic teletex equipment can accept the document.   XIf the document type to be transmitted is a PM.1 and/or MM document, the sender will initiate the communication by selecting case b).   XThe sender will then receive an ACCEPT SPDU without session user data. This allows the sender to recognize that the receiver is a basic teletex equipment and therefore that the documents are to be interchanged in a basic teletex format by using case a).   XThe sender could then inform the user that the interchange of the PM.1/MM documents is not possible as the addressee is a basic teletex equipment.   8.2.2.2 The recipient is a PM.1 and/or MM teletex equipment   XIf the document type to be transmitted is a basic teletex document, the sender will initiate the communication by selecting case a) and the rules specified in  8.2.1 apply.   XIf the document type to be transmitted is a PM.1 or MM teletex document, the sender will initiate the communication by selecting the case b).   XThe recipient will detect the presence of session user data and therefore will select the T.522 module to give an adequate response to the sender. Xp"%XH) These rules are to be specified in future Recommendation T.70bis.