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Recommendation T.561
TERMINAL CHARACTERISTICS FOR MIXED MODE OF OPERATION MM
CONTENTS
1 Scope
2 Field of application
3 References
4 Definitions
5 General characteristics of the equipment
6 Document handling
7 Communication aspects
8 Interworking between basic teletex equipments and teletex equipments supporting MM and/or PM.1
The CCITT,
considering
(a) that telematic services have been defined or are going to be defined for a number of applications;
Fascicle VII.7 - Rec. T.561 1
(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;
(c) that standardization work has been aiming at common protocols and compatible parameters for various
equipments 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 incorporated,
unanimously declares
that mixed mode characteristics should be designed and operated in accordance with the following standards.
1 Scope
1.1 The international teletex service requirements to the mixed mode of operation MM.1 are defined in
Recommendation F.230.
1.2 the service requirements for Group 4 facsimile service related to the mixed mode of operation MM.1 are defined in
Recommendation F.161.
1.3 This Recommendation defines terminal characteristics unique to the mixed mode of operation MM.1.
2 Field of application
This Recommendation applies to terminal equipment of the teletex service or the Group 4 facsimile service
supporting the mixed mode of operation MM.1.
3 References
The 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";
- 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 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 mode documents";
- Rec. T.522: "Communication application profile BT1 for document bulk transfer";
- Rec. T.563: "Terminal characteristics for Group 4 facsimile apparatus".
4 Definitions
Terms and their definitions are defined by Recommendation listed above.
2 Fascicle VII.7 - Rec. T.561
5 General characteristics of the equipment
5.1 General
5.1.1 Equipments 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.
5.1.2 These 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.
5.2 Basic features required for equipments supporting mixed mode MM.1
The 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.1 defined
in Recommendation T.501;
5.2.2 The ability to interchange 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 assured
reproduction area which is defined for ISO A4 paper size in 6.1.1.4.
5.2.4 The ability to receive and present documents, composed of:
a) one (or more) page(s) containing only content belonging to the teletex basic repertoire of
Recommendation T.61;
b) one (or more) page(s) containing only content encoded by the raster graphics coding scheme defined in
Recommendation T.6;
c) one (or more) page(s) containing content 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 by
Recommendation T.501.
5.2.6 The ability to create blocks of different sizes which can overlap within the page.
5.2.7 The 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).
5.3 Non═basic features for mixed mode
Fascicle VII.7 - Rec. T.561 3
One 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.
5.3.1 The 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).
5.3.2 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 for character
and raster graphics content. These non-basic characteristics are specified in Recommendation T.501.
6 Document handling
6.1 Requirements for the imaging process
6.1.1 Dimensions for text presentation
6.1.1.1 Basic measurement unit (BMU)
The size of the basic measurement unit (BMU) is 1/1200 ╧ 25.4 mm 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 20 BMU.
4 Fascicle VII.7 - Rec. T.561
6.1.1.2 Paper size
Different physical paper sizes can be used for presentation of mixed mode information. Such paper sizes are ISO
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 pages
As defined in Recommendation T.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.
The following nominal page are defined, showing the maximum allowed 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 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 defined above describe the presentation of text information on the specified paper sizes in both the
vertical and horizontal image orientations.
6.1.1.4 Assured reproduction area
Hard-copy 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.
For 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 400 BMU (8.466 mm) from the X-axis. The reserved area consists of 72 characters boxes, each
120 BMU in width and 200 BMU in height, starting at 945 BMU (20 mm) from the Y-axis and extending for 8640 BMU. The
maximum permitted character baseline offset of these character boxes is 72 BMU, so that the area of assured reproduction
starts at 472 BMU (10 mm) from the X-axis. Any interchanged text in the area of these character boxes may be suppressed,
Fascicle VII.7 - Rec. T.561 5
to avoid obscuring the image of the call identification line.
6 Fascicle VII.7 - Rec. T.561
The assured reproduction areas are defined as follows:
a) ISO A4 assured 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 BMU;
- 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 BMU;
- left margin = 400 BMU.
The assured reproduction areas for ISO A4, North American letter, ISO A3, Japanese legal and Japanese letter
paper sizes are illustrated in Figure 1/T.561, Figure 2/T.561, Figure 3/T.561, Figure 4/T.561 and Figure 5/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.
Raster graphics image parameters, for the image dimensions mentioned in Figures 1/T.561 and 2/T.561 are shown
for reference in Table 1/T.561.
Note - These edge margin values are shown for reference only and do not take account of tolerances on
either paper sizes or insertion angles.
FIGURE 1/T.561
Nominal page and assured reproduction area for ISO A4 paper size
Fascicle VII.7 - Rec. T.561 7
Note - The indicated size and location of the assured reproduction area accommodates ISO 3535 forms
UN/ECE trade documents, and the printed line lengths of the basic teletex service (i.e. 77 characters at
10 characters per 25.4 mm) 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.
FIGURE 2/T.561
Nominal page and assured reproduction area for the North American letter paper size
FIGURE 3/T.561
Nominal page and assured reproduction area for ISO A3 paper size
8 Fascicle VII.7 - Rec. T.561
FIGURE 4/T.561
Nominal page and assured reproduction area for Japanese legal paper size
FIGURE 5/T.561
Nominal page and assured reproduction area for Japanese letter paper size
Fascicle VII.7 - Rec. T.561 9
TABLE 1/T.561
Parameters for raster graphics images with dimensions equal to the
dimensions shown in Figures 1/T.561 and 2/T.561
(For reference only)
w
┌──────────────────────┬──────────────────────────────────────────────────────┐
│ Image dimensions │ Number of pels per line │
│ │ at various image resolutions │
├──────────┬───────────┼──────────┬──────────┬──────────┬──────────┬──────────┤
│ │ │ 180 │ 200 │ 240 │ 300 │ 400 │
│ BMU │ mm │ pels/ │ pels/ │ pels/ │ pels/ │ pels/ │
│ │ │ 25.4 mm │ 25.4 mm │ 25.4 mm │ 25.4 mm │ 25.4 mm │
├──────────┼───────────┼──────────┼──────────┼──────────┼──────────┼──────────│
│ 9 920 │ 210.0 │ 1488 │ 1654 │ 1984 │ 2480 │ 3308 │
│ │ │ │ │ │ │ │
│ 9 240 │ 195.6 │ 1386 │ 1540 │ 1848 │ 2310 │ 3080 │
│ │ │ │ │ │ │ │
│ 10 200 │ 215.9 │ 1530 │ 1700 │ 2040 │ 2550 │ 3400 │
├──────────┼───────────┼──────────┴──────────┴──────────┴──────────┴──────────┤
│ │ │ Number of raster graphics lines at various │
│ │ │ image resolutions │
├──────────┼───────────┼──────────┬──────────┬──────────┬──────────┬──────────┤
│ 14 030 │ 297.0 │ 2104 │ 2339 │ 2806 │ 3508 │ 4677 │
│ │ │ │ │ │ │ │
│ 13 200 │ 279.4 │ 1980 │ 2200 │ 2640 │ 3300 │ 4400 │
│ │ │ │ │ │ │ │
│ 12 400 │ 262.5 │ 1860 │ 2067 │ 2480 │ 3100 │ 4133 │
└──────────┴───────────┴──────────┴──────────┴──────────┴──────────┴──────────┘
6.1.1.5 Positioning of the page relative to the nominal page
The rules defined in Recommendation T.412, 7.3.2 apply.
6.1.2Call identification line (CIL)
6.1.2.1 The basic CIL presentation rules as defined in Recommendation F.200 should
10 Fascicle VII.7 - Rec. T.561
apply.
6.1.2.2 For printing CIL, an area, as defined in 6.1.1.4 is provided.
6.1.3Fall═back techniques
Some basic and non-basic features described in Recommendation T.501 are allowed to
be approximated using fall-back techniques.
This paragraph determines the fall-back procedure which may be used by the recipient
if features present in the interchanged document are not locally available.
The table below identifies the features for which fall-back procedure may be used.
All other features, not listed in this table, must not be approximated.
w
┌─────────────────────────────┬─────────────────────────────┐
│ Features │ Fall-back │
├─────────────────────────────┼─────────────────────────────┤
│ Bold │ Italicized or underlined │
│ │ │
│ Italicized │ Bold or underlined │
└─────────────────────────────┴─────────────────────────────┘
Fascicle VII.7 - Rec. T.561 11
6.2 Requirements for the formatting process
Not applicable.
7 Communication aspects
7.1 Application context for interchange of MM documents
7.1.1Application context name
The value of the "application context name" parameter is the following object
identifier value: {0 0 20 561 0}.
7.1.2Use of application service elements
7.1.2.1 Use of DTAM services
The 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 parameter are:
- 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}.
- the parameter value to represent the document application profile for
processable mode PM.1, defined in Recommendation T.502, 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 of the ACSE services.
Note - The use of reliable transfer service element (RTSE) is for further study.
7.1.3Use of presentation service
The presentation service is defined in Recommendation X.216. The ACSE is the sole
user of the P-CONNECT, P-RELEASE, P-U-ABORT and P-P-ABORT 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.
7.1.4Use of session service
The following session functional units are mandatory:
- kernel;
- half duplex;
- capability data exchange;
- minor synchronization;
- exceptions;
- activity management.
Note - When the sender 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, that the "service identifier" parameter be present in
the CONNECT SPDU.
7.1.5Use of transport service
12 Fascicle VII.7 - Rec. T.561
The transport service is described in Recommendation X.214. The protocol shall be in
accordance with Recommendation X.224, Class 0.
Fascicle VII.7 - Rec. T.561 13
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, that additional rules in accordance with Recommendation T.70, 5,
including Annexes A and B 1), be applied in addition to Recommendations X.214/X.224.
7.2 Coding schemes available
7.2.1Recommendation T.61 defines the coding scheme to be used for character coded text.
7.2.2Recommendation T.6 defines the coding techniques to be used for raster graphics.
7.3 Pel spacing for raster graphics content
7.3.1Equipments 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 25.4 mm in both horizontal and vertical directions.
7.3.2Optional pel spacing may be negotiated (see 5.3).
7.4 Orientation of mixed-mode page for transmission
The intended viewing orientation of mixed-mode pages may be either vertical or
horizontal. For the transmission of the page the orientation shall be vertical.
7.5 Receiving capabilities
7.5.1The 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.1
8.1 General
For teletex equipments supporting MM and/or PM.1:
- basic teletex documents are to be interchanged according to the rules defined
in Recommendation T.62 bis;
- PM.1 and MM teletex documents are to be interchanged according to the
application context defined in Recommendations T.561 and T.562.
Figure 6/T.561 below illustrates the two different sets of rules to be used by
teletex equipments depending on the interchanged document format.
14 Fascicle VII.7 - Rec. T.561
Note - Recommendation T.70 bis has to be specified in the future.
FIGURE 6/T.561
Illustration of the communication rules to be used
by teletex equipment supporting PM.1 and/or MM
8.2 Interworking rules
8.2.1The basic teletex equipment is the sender
The 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 and T.70.
In 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.62 bis module to accept the interchanged document [case a)].
8.2.2The PM.1 and/or MM teletex equipment is the sender
8.2.2.1 The recipient is a basic teletex equipment
If 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.
If the document type to be transmitted is a PM.1 and/or MM document, the sender will
initiate the communication by selecting case b).
The 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).
The 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.
Fascicle VII.7 - Rec. T.561 15
8.2.2.2 The recipient is a PM.1 and/or MM teletex equipment
If 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.
If 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).
The 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.
) These rules are to be specified in future Recommendation T.70 bis.
16 Fascicle VII.7 - Rec. T.561
