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IMPORT
R:\\ART\\W INTERNATIONAL TELECOMMUNICATION UNION
MF\\ITU.WM
F \*
mergeforma
t
CCITT T.563
THE INTERNATIONAL
TELEGRAPH AND TELEPHONE
CONSULTATIVE COMMITTEE
TERMINAL EQUIPMENT AND PROTOCOLS
FOR TELEMATIC SERVICES
TERMINAL CHARACTERISTICS FOR
GROUP 4 FACSIMILE APPARATUS
Recommendation T.563
IMPORT Geneva, 1991
R:\\ART\\
WMF\\CCIT
TRUF.WMF
\*
mergeform
at
Printed in Switzerland
FOREWORD
The CCITT (the International Telegraph and Telephone Consultative
Committee) is the permanent organ of the International Telecommunication Union
(ITU). CCITT is responsible for studying technical, operating and tariff
questions and issuing Recommendations on them with a view to standardizing
telecommunications on a worldwide basis.
The Plenary Assembly of CCITT which meets every four years, establishes
the topics for study and approves Recommendations prepared by its Study Groups.
The approval of Recommendations by the members of CCITT between Plenary
Assemblies is covered by the procedure laid down in Resolution No. 2 (Melbourne,
1988).
Recommendation T.563 was prepared by Study Group VIII and was approved
under the Resolution No. 2 procedure on the 18th of January 1991.
___________________
CCITT NOTE
In this Recommendation, the expression "Administration" is used for
conciseness to indicate both a telecommunication Administration and a recognized
private operating agency.
F ITU 1991
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.
Recommendation T.563
Recommendation T.563
TERMINAL CHARACTERISTICS FOR GROUP 4 FACSIMILE APPARATUS
(Revised 1990)
CONTENTS
1 General
2 Scope of Recommendation concerning Group 4 facsimile apparatus
3 General characteristics of the apparatus
4 Mixed mode capabilities
5 Communications
6 Network-related requirements
7 Indicators
8 Access to facsimile MHS
9 Implementation of apparatus
Annex A ù Guaranteed reproducible area for Group 4 apparatus conforming to
Recommendation T. 563
Appendix I ù Communication environment establishment
The CCITT,
considering
(a) that Recommendation T.2 refers to Group 1 type apparatus for ISO A4
document transmission over a telephone-type circuit in approximately six minutes;
(b) that Recommendation T.3 refers to Group 2 type apparatus for ISO A4
document transmission over a telephone-type circuit in approximately three
minutes;
(c) that Recommendation T.4 refers to Group 3 type apparatus for ISO A4
document transmission over a telephone-type circuit in approximately one minute;
(d) that there is a demand for Group 4 apparatus which incorporates means
for reducing the transmission time and assures essentially error-free reception
of the documents;
(e) that telematic terminals including Group 4 facsimile apparatus are to
be standardized, taking into account the commonality among these terminals;
(f) that there is a demand for mixed mode of operation where both facsimile
coded information and character coded information can be treated within a page by
the same apparatus;
Recommendation T.563 PAGE17
unanimously declares
that Group 4 facsimile apparatus as defined in Recommendation T.0 should
be designed and operated according to the following standard.
1 General
1.1 Group 4 facsimile apparatus is used mainly on public data networks (PDN)
including circuit-switched, packet-switched, and the integrated services digital
network (ISDN). The apparatus may be also used on the public switched telephone
network (PSTN) where an appropriate modulation process will be utilized.
1.2 The procedures used with Group 4 facsimile apparatus enable it to transmit
and reproduce image coded information essentially without transmission errors.
1.3 Group 4 facsimile apparatus has the means for reducing the redundant
information in facsimile signals prior to transmission.
1.4 The basic image type of the Group 4 facsimile apparatus is black and
white.
Other image types, e.g. grey scale image or colour image are for further
study.
1.5 There are three classes of Group 4 facsimile terminals:
ù Class I ù Minimum requirement is a terminal able to send and receive
documents containing facsimile encoded information (in accordance with
Recommendation T.6, T.503 and T.521).
ù Class II ù Minimum requirement is a terminal able to transmit documents
which are facsimile encoded (in accordance with Recommendations T.6,
T.503 and T.521). In addition, the terminal must be capable of
receiving documents which are facsimile coded (in accordance with
Recommendations T.6, T.503 and T.521). Teletex coded (in accordance
with the basic coded character repertoire as defined in
Recommendations T.60 and T.61), and also mixed-mode documents (in
accordance with Recommendation T.561).
ù Class III ù Minimum requirement is a terminal which is capable of
generating, transmitting and receiving facsimile coded documents (in
accordance with the Recommendations T.6, T.503 and T.521), Teletex
coded documents (in accordance with the basic coded character
repertoire as defined in Recommendations T.60 and T.61), and mixed-mode
documents (in accordance with Recommendation T.561). See Note.
Note ù The above definitions are extracted from Study Group I where
"terminal" is used instead of "apparatus".
2 Scope of Recommendations concerning Group 4 facsimile apparatus
2.1 This Recommendation defines the general aspects of Group 4 facsimile
apparatus.
2.2 The rules to be followed in the Group 4 facsimile services are defined in
Recommendation F.184.
2.3 The Group 4 facsimile coding scheme and facsimile control functions are
defined in Recommendation T.6.
2.4 Terminal supporting Group 4 facsimile mode of operation communicates with
unique procedures that are described as follows:
a) the interface to the physical network is defined in this
Recommendation. See Note;
b) the transport end-to-end control procedure is defined in Recommendation
T.70;
c) Group 4 facsimile control procedures are defined in
Recommendation T.62;
PAGE16 Recommendation T.563
d) Group 4 facsimile communication application profile is defined in
Recommendation T.521;
e) Group 4 facsimile document application profile is defined in
Recommendation T.503.
Note ù Recommendation T.71 may be applicable for PSTN operation.
2.5 When operating as mixed-mode terminals, Recommendation T.561 applies.
2.6 When operating as basic Teletex terminals, Recommendations T.60 and T.61
apply.
3 General characteristics of the apparatus
3.1 Basic characteristics
3.1.1 The Group 4 facsimile apparatus provides the means for direct document
transmission from any subscriber to any other subscriber.
3.1.2 All apparatus participating in the international Group 4 facsimile service
has to be compatible with each other at the basic level defined in this
Recommendation. Additional operational functions may be invoked.
3.1.3 The range of data rates is described in S 6. Detailed arrangements on a
national level are left 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 data throughput rates.
3.1.4 The page is the basis for facsimile message formatting and transmission.
Both A4 and North American paper formats are taken into account.
3.1.5 Facsimile coding schemes are applied in order to reduce the redundant
information in facsimile signals prior to transmission.
3.1.6 The apparatus must have the ability to reproduce facsimile messages. The
content, layer and format of facsimile messages must be identical at the
transmitting and receiving apparatus.
3.1.7 The reproducible area is defined within which facsimile messages are
assured to be reproduced. (See S 3.2.6.)
3.1.8 The Group 4 facsimile apparatus should provide means for automatic
reception. In addition, Class II/III apparatus should provide means for automatic
reception of Teletex and mixed mode documents.
3.1.9 All classes of Group 4 facsimile apparatus shall incorporate the functions
defined as basic for the Group 4 facsimile service in S 3.2 below. In addition,
optional functions can be incorporated. In this Recommendation, the optional
functions are divided into CCITT standardized options and nationally and/or
privately specified options.
3.2 Basic functions
3.2.1 Group 4 facsimile mode of operation shall be capable of handling:
a) communication application profile as defined in Recommendation T.521;
b) document application profile as defined in Recommendation T.503;
c) the basic facsimile coding scheme as defined in Recommendation T.6;
d) the control function associated with the basic facsimile coding scheme
as defined in Recommendation T.6.
Recommendation T.563 PAGE17
3.2.2 All classes of Group 4 apparatus shall have the following provisions for
facsimile messages:
a) provision for scanning the documents to be transmitted (see S 3.2.5);
b) provision for receiving and presenting hard or soft copies of the
documents.
3.2.2.1 In addition, Group 4 Class II apparatus shall have provision for
receiving and displaying basic Teletex and mixed mode documents.
3.2.2.2 In addition to the requirements for Group 4 Class II apparatus,
Class III apparatus shall have provisions for generating and transmitting basic
Teletex and mixed mode documents.
3.2.3 Basic page formatting functions are as follows
a) vertical page orientation;
b) paper size of ISO A4;
c) reproducible area/printable area is defined, taking into account ISO A4
and North American paper formats and ISO standard 3535.
3.2.4 Terminal identification
Each Group 4 facsimile apparatus should be equipped with a unique
identification. Details of the identification are given in Recommendation F.184.
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 left
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 ISO A4 paper size is
shown in Annex A to this Recommendation.
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/T.563.
include 563-t01eTABLE 1/T.563
Resolution (pels/25.4 mm) Horizontal and vertical
tolerance (%)
200 ┤ 200 ▒ 1
240 ┤ 240 ▒ 1
300 ┤ 300 ▒ 1
400 ┤ 400 ▒ 1
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.)
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/T.563 and 2b/T.563
for all the Group 4 resolutions for ISO A4, North American Letter, ISO B4,
ISO A3, Japanese Legal, Japanese Letter, North American Legal and North American
Ledger paper.
PAGE16 Recommendation T.563
Tableau 563-T02E à l'italienne
Recommendation T.563 PAGE17
Tableau 563-T03E à l'italienne
PAGE16 Recommendation T.563
Table 3/T.563 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/T.563 illustrates the blanking
procedure for ISO A4 and North American Letter paper. The same procedure is used
for the other paper formats.
include 563-t04eTABLE 3/T.563
Blanking and address reference point for different paper sizes
Paper size Resolution Pels Pels Blanki Referen Total
(pels/25.4 per per ng ce line
mm) line each margin point length
paper (pels) (mm)
size
line
ISO A4 (B)
200 ┤ 200 1728 1654 333333 (38.1 219.46
240 ┤ 240 2074 1984 7 ) 219.46
300 ┤ 300 2592 2480 333334 (46.1 219.46
400 ┤ 400 3456 3308 5 ) 219.46
333335 (57.1
6 )
333337 (75.1
4 )
North (A)
American 200 ┤ 200 1728 1700 333331 (15.1 219.46
Letter 240 ┤ 240 2074 2040 4 ) 219.46
300 ┤ 300 2592 2550 333311 (18.1 219.46
400 ┤ 400 3456 3400 7 ) 219.46
333332 (22.1
1 )
333332 (29.1
8 )
ISO B4 200 ┤ 200 2048 1968 333334 (41.1 260.10
240 ┤ 240 2458 2362 0 ) 260.10
300 ┤ 300 3072 2952 333334 (49.1 260.10
400 ┤ 400 4096 3936 8 ) 260.10
333336 (61.1
0 )
333338 (81.1
0 )
ISO A3 200 ┤ 200 2432
240 ┤ 240
300 ┤ 300
400 ┤ 400
Recommendation T.563 PAGE17
2918 2338 333334 (48.1 308.86
3648 2806 7 ) 308.86
4864 3508 333315 (57.1 308.86
4676 6 ) 308.86
333337 (71.1
0 )
333339 (95.1
4 )
Japanese 200 ┤ 200 2048 2024 333331 (13.1 260.10
Legal 240 ┤ 240 2458 2428 2 ) 260.10
300 ┤ 300 3072 3036 333311 (16.1 260.10
400 ┤ 400 4096 4048 5 ) 260.10
333331 (19.1
8 )
333332 (25.1
4 )
Japanese 200 ┤ 200 1728 1434 333314 (148. 219.46
Letter 240 ┤ 240 2074 1720 7 1) 219.46
300 ┤ 300 2592 2150 333317 (178. 219.46
400 ┤ 400 3456 2868 7 1) 219.46
333322 (222.
1 1)
333329 (295.
4 1)
North 200 ┤ 200 1728 1700 333331 (15.1 219.46
American 240 ┤ 240 2074 2040 4 ) 219.46
Legal 300 ┤ 300 2592 2550 333311 (18.1 219.46
400 ┤ 400 3456 3400 7 ) 219.46
333332 (22.1
1 )
333332 (29.1
8 )
North 200 ┤ 200 2432 2200 333311 (117. 308.86
American 240 ┤ 240 2918 2640 6 1)
Ledger 300 ┤ 300 3648 3300 333313 (140.
400 ┤ 400 4864 4400 9 1)
333317 (175.
4 1)
333323 (233.
2 1)
PAGE16 Recommendation T.563
308.86
308.86
308.86
Note ù The pels as defined in the blanking margin section (blanking
margin A and B are shown in Fig.1/T.563) are equivalent to the discarded
pels defined in Recommendation T.503.
Recommendation T.563 PAGE17
The raster point in the upper left corner of an ISO page is used as a
reference for portrait mode character printing. This raster point, termed the
(1.1) raster reference point, is used as a starting point for determining
character margins and positions. This is also illustrated in Figure 1/T.563.
FIGURE 1/T.563 = 23.5 cm
PAGE16 Recommendation T.563
3.2.8 Group 4 facsimile class structure
Table 4/T.563 shows the class structure of Group 4 facsimile apparatus.
include 563-t05eTABLE 4/T.563
Class structure
Class I II III
(See Note 1) (See Note 1) (See Note 1)
Standard pel 200 200 and 300 200 and 300
transmission density (See Note (See Note 2)
(pels/25.4 mm) 2)
Optional pel 240 and/or 240 and/or 240 and/or
transmission density 300 400 400
(pels/25.4 mm) and/or 400 (See Note 3) (See Note 3)
Pel conversion Not required Yes Yes
capability in standard
Teletex Not required Reception Yes
only
Mixed mode Not required Reception Yes
only
Page memory Not required Yes Yes
Use of document See Table 5/T.563
application profile
Recommendation T.563 PAGE17
Use of communication See Table 5/T.563
application profile
Note 1 ù Administrations may determine which class, with options,
to be used for their national service. Standardization work has to
continue with the goal of achieving a uniform standard.
Note 2 ù When operating as a mixed mode terminal per Recommendation
T.561, the pel receiving density of 240 pels per 25.4 mm is
required.
Note 3 ù To achieve a high service quality, the pel density of the
scanner and printer should be greater than or equal to the
transmission pel density. This requirement is waived for a terminal
which has a scanner or printer with a pel density of 240 ┤ 240 pels
per 25.4 mm and can communicate at 300 pels per 25.4 mm. In this
case, the 240 ┤ 240 pels per 25.4 mm terminal will exceptionally
meet the standard Class II/III requirement.
Note 4 ù When a resolution conversion is necessary, the conversion
is performed by the apparatus which minimizes the transmission cost
and time. An exception would be a 240 ┤ 240 pels per 25.4 mm
terminal transmitting to a 300 ┤ 300 pels per 25.4 mm terminal
which is operating at the standard transmission density.
Note 5 ù Pel conversion algorithms should aim at low impairment of
the quality and are for further study.
3.2.9 Facsimile coding schemes
3.2.9.1 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
procedures in lower levels.
3.2.9.2 On an optional basis, an apparatus can use other CCITT standardized
coding schemes defined in Recommendation T.6.
3.2.9.3 When the encoded bit string based on T.6 is arranged in the octet
string of ASN.1, 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.
3.3 CCITT-standardized optional functions of Group 4 facsimile mode of
operation
3.3.1 The possibility of using optional functions can be negotiated during a
handshaking procedure in the communication application profile (see
Recommendation T.521).
3.3.2 The optional functions are invoked by the communication application
profile (see Recommendation T.521).
3.3.3 As the service develops, additions and changes to the CCITT-standardized
optional function listed below may be needed.
a) optional coding schemes defined in Recommendation T.6;
b) control functions associated with optional coding schemes;
c) grey scale images;
d) colour images;
e) resolution conversion algorithms.
3.3.4 Optional page formatting functions are as follows:
a) page sizes of ISO B4, ISO A3, Japanese legal, Japanese letter, North
American legal and North American ledger;
b) other page formats are for further study.
3.4 Optional functions of Group 4 facsimile mode of operation for national
standardization or private use
The CCITT standardization includes the necessary rules and means for
indication of, or escape into, functions specified nationally or for private use
(see Recommendations T.62 and T.521).
3.5 Default conditions for Group 4 facsimile mode of operation
In the absence of specific indications, the receiving apparatus shall
assume the following conditions:
a) communication (as specified in Recommendation T.521):
ù one way (calling apparatus transmitting the facsimile message);
ù normal document;
b) coding scheme:
ù basic facsimile coding scheme;
c) image type:
ù black and white two-level image;
d) presentation:
ù paper size of ISO A4;
ù pel transmission density of 200 pels per 25.4 mm;
ù number of picture elements along scan line of defined values in
Table 3/T.563;
ù blanking margin of defined values in Table 3/T.563
PAGE16 Recommendation T.563
ù vertical page of orientation.
Recommendation T.563 PAGE17
4 Mixed mode capabilities
For mixed mode of operation, requirements for Group 4 Class II and III
terminals are specified in Recommendation T.561.
5 Communications
5.1 Storage
Receiving storage is not required for Group 4 Class I terminals. The
minimum storage requirement for Group 4 Class II and III is 128 K octets. This
value is based on a pel transmission density of 300 pels per 25.4 mm for an
ISO A4 document. However, this does not cover the worst case situation for dense
documents. Additional memory may be required and can be negotiated.
5.2 Call identification
The control procedures include the exchange of reference information prior
to sending any document. Details of the call identification line are covered in
Recommendation F.184.
Printing capability of the Call Identification Line (CIL) is mandatory.
The printing of the CIL is selected by the user.
If printing is selected, the CIL is printed on a reserved area at either
the top of the page or the bottom. Refer to Figure A-1/T.563. The reserved area
is 4.23 mm (200 BMU) in height and 183 mm (8640 BMU) in width. The size of the
basic measurement unit (BMU) is 1/1200 per 25.4 mm.
5.3 Interworking
There are three document types, namely "Facsimile", "Mixed Mode" and
"Basic Teletex". These are shown in Table 5/T.563. A terminal can transfer one or
more documents of the same type in a single association. In the case of
"Facsimile" or "Mixed Mode", the document type is indicated in D-INITIATE service
primitive using the parameter "document application profile". If the document
type is not supported by the called terminal, this will be indicated by the
"result" parameter of the D-INITIATE service confirmation.
include 563-t06eTABLE 5/T.563
Document type
Document type Group 4 Mixed Mode Basic
facsimile Teletex
Class of Group 4 Class I, II & Class II & III Class II &
facsimile III III
apparatus
Document FDA FDA none
Architecture (See Note
Class 2)
Document Rec. T.503 Rec. T.501 non Profile
Application (See Note 1) (See Note
Profile 2)
Communication Rec. T.521 Rec. T.522 non Profile
Application (See Note
Profile 2)
Note 1 ù When using the Group 4 facsimile mode, Document Profile
Descriptor defined in Recommendation T.503 is not transmitted using
session protocol data unit (SPDU).
Note 2 ù Basic Teletex documents are transmitted outside DTAM
application.
PAGE16 Recommendation T.563
The negotiation and indication mechanisms are defined in
Recommendation T.433. Appendix I illustrates some example of the session
establishment phase. Table 6/T.563 specifies the interworking matrix among
Group 4 facsimile apparatus based on negotiation result.
include 563-t07eTABLE 6/T.563
Interworking Matrix among Group 4 facsimile apparatus
Class I Class II Class III
Sender
Receiver
Class I Group 4 Group 4 Group 4
facsimile facsimile facsimile
Class II Group 4 Group 4 Group 4
facsimile facsimile facsimile
Mixed Mode
Basic
Teletex
Class III Group 4 Group 4 Group 4
facsimile facsimile facsimile
Mixed Mode
Basic
Teletex
5.4 Communication application profile for Group 4 facsimile document
The communication application profile to be used is BT 0, specified in
Recommendation T.521.
Specific parameter values to be used in the D-INITIATE and D-CAPABILITY
service primitive are:
ù the parameter value to represent the document application profile for
Group 4 facsimile is defined in Recommendation T.503;
ù the parameter value to represent the document architecture class is
FDA, defined in Recommendation T.412.
6 Network-related requirements
6.1 Networks
The Group 4 facsimile transport service can be provid d using a circuit-
switched public data network (CSPDN), a packet-switched public data network
(PSPDN), a public switched telephone network (PSTN), or an integrated services
digital network (ISDN). In all types of network the Group 4 facsimile apparatus
will provide automatic answering, transmission, reception and clearing.
6.2 Circuit-switched public data network (CSPDN)
a) Function and procedural aspect of the interface: Recommendation X.21.
b) With external data circuit terminating equipment (DCE) ù mechanical and
electrical and characteristics of the interface: Recommendation X.21.
c) Bit rates: user classes of services 4 to 7 in Recommendation X.1.
d) Link procedure: LAPB/Recommendation X.75.
6.3 Packet-switched public data network (PSPDN)
a) Function and procedural aspects of the interface: Recommendation X.25,
levels 1, 2, 3.
b) Duplex transmission.
Recommendation T.563 PAGE17
c) Bit rates: user classes of services 8 to 11 in Recommendation X.1.
d) Number of logical channels at a time: one or more.
6.4 Public switched telephone network (PSTN)
a) Modulation/demodulation schemes are for further study.
b) Function and procedural aspects of the interface: for further study.
c) Link procedure: Recommendation T.71 may be applicable.
d) Bit rate: for further study.
e) Automatic answering: Recommendation V.25.
6.5 Integrated services digital network (ISDN)
The operations and rules of Group 4 facsimile apparatus on the ISDN are
defined in Recommendation T.90.
7 Indicators
7.1 Indicators should inform users about situations in which negative effects
on the grade of service can be expected.
7.2 The following indicators are required:
a) apparatus unable to transmit (e.g. paper jam at transmitting end);
b) apparatus unable or soon unable to receive (e.g. paper jam or receiving
memory nearly full);
c) operator assistance required;
d) message received in store.
8 Access to facsimile MHS
Users of Group 4 facsimile apparatus may wish to have access to the
services offered by the message handling system (MHS). This requires the ability
to generate control documents (see Recommendation T.300 series). The details are
left for further study.
9 Implementation of apparatus
Although paper sizes are referred to, this does not always require
physical paper scanner and/or printer to be implemented. Details may be defined
by Administrations.
If the message is not generated from a physical scanner or displayed on
paper, then the signals appearing across the network interface shall be identical
to those which would be generated if paper input and/or output has been
implemented.
PAGE16 Recommendation T.563
ANNEX A
(to Recommendation T. 563)
Guaranteed reproducible area for Group 4 apparatus
conforming to Recommendation T.563
FIGURE A-1/T.563 = 11,5cm
FIGURE A-2/T.563 = 9,5 cm
include 563-t08eTABLE A-1/T.563
Horizontal losses
Printer/Scanner a ▒ 0.5 mm
Enlarging b ▒ 2.1 mm
Skew c ▒ 2.6 mm
Positioning errors d ▒ 1.5 mm
Recommendation T.563 PAGE17
FIGURE A-3/T.563 = 10 cm
include 563-t09eTABLE A-2/T.563
Vertical losses
Paper insertion f 4.0 mm
CIL printing g 4.23 mm
Skew h ▒ 1.8 mm
Scan line tolerance i ▒ 2.97 mm
(see Note)
Gripping loss j 2.0 mm
Note ù Scanning density tolerance will reduce to 0
mm on roll-fed machines
PAGE16 Recommendation T.563
APPENDIX I
(to Recommendation T.563)
Communication environment establishment
I.1 Table I.1/T.563 summarizes the selection of communication application
profile and initial session command exchange.
include 563-t10eTABLE I-1/T.563
Selection of communication application profile
Called G-4 Class I G-4 Class II G-4 Class Basic teletex
III
Calling
G4 class I T.521 T.521 T.521 T.521
CSS/RSSP CSS/RSSP CSS/RSSP CSS/RSSP (no SUD)
(Calling
terminal:
Disconnect)
G4 class T.521 T.521 T.521 T.521
II CSS/RSSP CSS/RSSP CSS/RSSP CSS/RSSP (no SUD)
(Calling
terminal:
Disconnect)
G4 class T.522 T.522 T.522 T.522
III CNa)/RSSP CN/AC CN/AC CNa)/RSSP
T.521 T.62 selection
selection
(fall back)
Basic T.62 (no T.62 (no T.62 (no T.62 (no SUD)
teletex SUD) SUD) SUD) CSS/RSSP
CSS/RSSN CSS/RSSP CSS/RSSP
(Calling
terminal:
Disconnect)
a)When interworking with T.62 based equipment, Service Identifier
parameter defined in T.62 is present
in the CONNECT SPDU.
CNCONNECTION SPDU defined in Recommendation X.225
ACACCEPT SPDU defined in Recommendation X.225
Recommendation T.563 PAGE17
I.2 Some examples of the session establishment phase are as follows:
I.2.1 In case of Group 4 Class I terminal calling (see Figure I-1/T.563)
FIGURE I-1/T.563 = 12,5 cm
PAGE16 Recommendation T.563
I.2.2 In case of Group 4 Class II terminal calling (see Figure I-2/T.563)
FIGURE I-2/T.563 = 12,5 cm
Recommendation T.563 PAGE17
I.2.3 In case of Group 4 Class III terminal calling (see Figure I-3/T.563)
FIGURE I-3/T.563 (Sheet 1 of 2) = 15,5 cm
FIGURE I-3/T.563 (Sheet 2 of 2) = 16 cm
PAGE16 Recommendation T.563
I.2.4 In case of basic Teletex terminal calling (see Figure I-4/T.563)
FIGURE I-4/T.563 = 7,5 cm
Recommendation T.563 PAGE17