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Recommendation T.521
COMMUNICATION APPLICATION PROFILE BT0 FOR DOCUMENT BULK
TRANSFER BASED ON THE SESSION SERVICE
(According to the rules defined in Recommendation T.62 bis)
CONTENTS
0 Introduction
1 Scope and field of application
2 References
3 Definitions
4 Abbreviations and conventions
5 Definition of communication application profile BT0
5.1 Overview of BT0
5.2 DTAM functional units
5.3 DTAM service primitives and lower layer mapping
1 Fascicle VII.7 - Rec. T.521
6 Document interchange data structures
7 Document transfer
7.1 Synchronization
7.2 Document transfer recovery
Annex A - Overall protocol sequence
0 Introduction
T.400 Series of Recommendations define the open document architecture and interchange format (T.410 Series)
and the DTAM Services and protocols (T.430 Series) for the purpose of the document transfer and manipulation. In order to
apply T.400 Series to various telematic services it is necessary to specify the application profiles for each service that
consists of a document application profile and a communication application profile.
According to this requirement, T.500 Series of Recommendations define the document application profiles and
T.520 Series of Recommendations define the communication application profiles.
Recommendation T.521 is one of a set of T.520 Series of Recommendations to define the communication
application profile for the document bulk transfer based on the session service according to the rules defined in
Recommendation T.62 bis.
1 Scope and field application
This Recommendation defines the communication application profile for the document bulk transfer using the
session service defined in Recommendation T.62 bis in terms of:
a) DTAM functional units used;
b) DTAM service primitives and parameters used;
c) lower layer X.215 session service mapping according to the rules of T.62 bis.
2 References
The following references are required in order to implement this communication profile defined in this
Recommendation.
- Rec. T.431: Document transfer and manipulation (DTAM) - Services and protocols - Introduction and
general principles
- Rec. T.432: Document transfer and manipulation (DTAM) - Service protocols - Service definition
- Rec. T.433: Document transfer and manipulation (DTAM) - Service protocols - Service specification
- Rec. T.62: Control procedures for teletex and Group 4 facsimile services
- Rec. T.62 bis: Control procedures for teletex and Group 4 facsimile services based on Recommendation
X.215/X.225
- Rec. X.215: Session service definition for open systems interconnection of CCITT application
Fascicle VII.7 - Rec. T.521 2
3 Definitions
The definitions of T.400 Series of Recommendations and Recommendation T.62 bis also apply to this
Recommendation.
4 Abbreviations and conventions
The abbreviations and conventions defined in T.400 Series of Recommendations and Recommenda- tion T.62 bis
also apply to this Recommendation.
5 Definitions of communication application profile BT0
5.1 Overview of BT0
This Recommendation defines units and communication support function in accordance with Recommendation
T.431.
5.2 DTAM functional units
The following functional units defined in Recommendation T.432 are used for BT0:
- association use control (kernel);
- capability;
- document bulk transfer;
- token control;
- exception report;
- reliable transfer mode 1.
5.3 DTAM service primitives and lower layer mapping
5.3.1 DTAM service primitives and parameters
General DTAM service definition and parameters are defined in Recommendation T.432. This section specifies the
parameters of DTAM service of BT0.
5.3.1.1D-INITIATE service parameters
The following parameters of this service are used as follows:
- transparent mode;
- telematic requirements;
- application capabilities;
- result.
Table 1-A/T.521 lists the D-INITIATE service parameters.
1) Transparent mode
This parameter should be specified in D-INITIATE request service primitive.
2) Telematic requirements
The following functional units defined in Recommendation T.432 are used for BT0 as mandatory functional
units.
3 Fascicle VII.7 - Rec. T.521
- association use control (kernel);
- capability;
- document bulk transfer;
- token control;
- exception report;
- reliable transfer mode 1.
Fascicle VII.7 - Rec. T.521 4
3) Application capabilities
This "application capabilities" is defined in Recommendation T.432 and the following sub- parameters:
a) document application profile
The value of this parameter indicates the document application profile being used. Its value is
specified in Recommendations that define terminal characteristics for particular telematic services.
b) Document architecture class
The value of this parameter indicates the document architecture class used in the entire association.
The use of this parameter and its possible value is specified in the Recommendations that define
terminal characteristics for particular telematic services.
4) Result
This field can take the values defined in Recommendation T.432.
TABLE 1-A/T.521
D-INITIATE service parameters
w
┌──────────────────────────────────┬────────────┬────────────┬────────────┬────────────┐
│ │D-INITIATE │ D-INITIATE │ D-INITIATE │ D-
INITIATE │
│ │ request │ indication │ response │
confirm │
├──────────────────────────────────┼────────────┼────────────┼────────────┼────────────┤
│ Transparent mode │ M │ │ │
│
├──────────────────────────────────┤ │ │ │
│
│ Telematic requirements │ M │ M(=) │ M │ M(=)
│
├──────────────────────────────────┤ │ │ │
│
│ Application capabilities │ M │ M(=) │ M │ M(=)
│
│----------------------------------│ │ │ │
│
│| Document application profile │ M │ M(=) │ M │ M(=)
│
│| │ │ │ │
│
│| Document architecture class │ M │ M(=) │ M │ M(=)
│
├──────────────────────────────────┤ │ │ │
│
│ Result │ │ │ U │ C(=)
│
└──────────────────────────────────┴────────────┴────────────┴────────────┴────────────┘
5.3.1.2 D-TERMINATE service parameters
This service has no parameter for BT0. Only the initiator can issue D-TERMINATE. In
addition, the initiator can issue D-TERMINATE only if he has a data token.
5.3.1.3 D-U-ABORT service parameters
This service has the parameter of "user information".
Table 1-B/T.521 lists the D-U-ABORT service parameters.
TABLE 1-B/T.521
5 Fascicle VII.7 - Rec. T.521
D-U-ABORT service parameters
w
┌──────────────────────────────────┬────────────┬────────────┐
│ │ D-U-ABORT │ D-U-ABORT │
│ │ request │ indication │
├──────────────────────────────────┼────────────┼────────────┤
│ User information │ U │ C(=) │
└──────────────────────────────────┴────────────┴────────────┘
Fascicle VII.7 - Rec. T.521 6
5.3.1.4 D-CAPABILITIY service parameters
This service has the parameter "application capabilities" which consists of sub
parameters as follows:
- document application profile;
- document architecture class;
- none-basic document characteristics.
Table 1-C/T.521 lists the D-CAPABILITY service parameters.
TABLE 1-C/T.521
D-CAPABILITY service parameters
w
┌──────────────────────────────────┬────────────┬────────────┬────────────┬───
─────────┬
│ │D-CAPABILITY│D-CAPABILITY│D-CAPABILITY│D-CAPABILITY│
│ │ request │ indication │ response │
confirm │
├──────────────────────────────────┼────────────┼────────────┼────────────┼────────────┤
│ Application capabilities │ │ │ │
│
│----------------------------------│ │ │ │
│
│| Document application profile │ M │ M(=) │ M │ M(=)
│
│| │ │ │ │
│
│| Document architecture class │ M │ M(=) │ M │ M(=)
│
│| │ │ │ │
│
│| Non-basic document │ │ │ │
│
│| characteristics │ U │ C(=) │ U │ C(=)
│
└──────────────────────────────────┴────────────┴────────────┴────────────┴────────────┘
1) Application capabilities
See 5.3.1.1.
a) Document application profile
See 5.3.1.1.
b) Document architecture class
See 5.3.1.1.
c) Non-basic document characteristics
This is the "non-basic document characteristics" defined in Recommendation
T.432.
5.3.1.5 D-TRANSFER service parameters
This service has the following parameters:
1) Document information
This consists of the interchange data elements representing the document. The
"Document characteristics" from the document profile are transferred using S-
ACT-START (Note).
Note - All interchange data elements, except the document profile descriptor,
7 Fascicle VII.7 - Rec. T.521
are transferred using S-DATA service. The document profile is reconstructed by
the receiving DTAM PM, on the basis of the "document characteristics"
transferred in the S-ACT-START.
2) Document information type
This parameter always has the value "transfer of a document from its
beginning" (see Recommendation T.432).
3) Document reference information
The value of this parameter is to be provided by the DTAM user in accordance
with the rules specified in Recommendation T.432.
4) Result
This parameter has one of the values "document information transferred" and
"document information not transferred", as defined in Recommendation T.432.
Fascicle VII.7 - Rec. T.521 8
5) Checkpoint mechanism
Checkpoint mechanism 2 is applied. Value of this parameter is integer 2.
The following restriction is applied to the transfer syntax coding rules defined in
X.209 for the interchange of the document application profile defined in Recommendation
T.503:
- Length fields longer than three octets shall not be used. A length field of
three octets allows for the representation of a length of up to 65 535; a data
element with a length exceeding 65 535 shall have a length field of the
indefinite form.
Table 1-D/T.521 lists the D-TRANSFER service parameter.
TABLE 1-D/T.521
D-TRANSFER service parameters
w
┌──────────────────────────────────┬────────────┬────────────┬────────────┐
│ Parameter │ D-TRANSFER │ D-TRANSFER │ D-TRANSFER │
│ │ request │ indication │confirmation│
├──────────────────────────────────┼────────────┼────────────┼────────────┤
│ Document information │ M │ M(=) │ │
│ │ │ │ │
│ Document information type │ M │ M(=) │ M(=) │
│ │ │ │ │
│ Document reference information │ M │ M(=) │ M(=) │
│ │ │ │ │
│ Result │ │ │ M │
│ │ │ │ │
│ Checkpoint mechanism │ M │ │ │
└──────────────────────────────────┴────────────┴────────────┴────────────┘
Note - The document information is transferred using the type of normal document.
5.3.1.6 D-CONTROL GIVE service parameters
The D-CONTROL GIVE service surrenders all available tokens and has no parameter.
5.3.1.7 D-TOKEN PLEASE service parameters
The D-TOKEN PLEASE service is used to request the data token and has no parameter.
5.3.1.8 D-U-EXCEPTION-REPORT service parameters
This service has the parameter of "user information".
Table 1-E/T.521 lists the D-U-EXCEPTION-REPORT service parameter.
- User information
This is the user information associated with the exception report of
application association.
TABLE 1-E/T.521
D-U-EXCEPTION-REPORT service parameters
w
┌────────────────────────┬──────────────────────┬──────────────────────┐
│ │ D-U-EXCEPTION-REPORT │ D-U-EXCEPTION-REPORT │
│ │ request │ indication │
├────────────────────────┼──────────────────────┼──────────────────────┤
9 Fascicle VII.7 - Rec. T.521
│ User information │ U │ C(=) │
└────────────────────────┴──────────────────────┴──────────────────────┘
Fascicle VII.7 - Rec. T.521 10
5.3.1.9 D-P-EXCEPTION-REPORT service parameter
This is used as defined in Recommendation T.432.
5.3.2Use of session service and parameter mapping
5.3.2.1 DTAM protocol mapping to Recommendation X.215 session service
This mapping rule is defined in 7.2 of Recommendation T.433.
Note - D-TRANSFER conf is implicitly informed by receipt of S-ACT END conf, S-ACT
INT conf and S-ACT DCAD conf.
5.3.2.2 Parameters mapping to session parameters
Tables 2-A/T.521 to 2-H/T.521 show the mapping rule between DTAM service parameters
and basic and additional session parameters.
The category of parameters is defined as follows:
- 1: parameters are generated by DTAM user;
- 2: parameters are generated by DTAM provider;
- 3: parameters are generated by DTAM session provider.
Annex A illustrates the example of protocol sequences for BT0.
TABLE 2-A/T.521
D-INITIATE
w
┌───────────────────────────────────┬──────────────────────────┬───────────┐
│ DTAM service parameters │ Basic and additional │ Category │
│ │ session parameters │ │
├───────────────────────────────────┼──────────────────────────┼───────────┤
│ Telematic requirements │ Session requirements │ │
│-----------------------------------│--------------------------│ │
│ Application capabilities │ │ 1 │
│ ----------------------------------│ │ │
│ | Document application profile │ Session user data │ │
│ |---------------------------------│ │ │
│ | Document architecture class │ │ │
├───────────────────────────────────┼──────────────────────────┼───────────┤
│ │ Session reference │ │
│ │--------------------------│ │
│ │ Non-basic session │ │
│ None │ capabilities │ 2 │
│ │--------------------------│ │
│ │ Service identifier │ │
│ │--------------------------│ │
│ │ Inactivity timer │ │
├───────────────────────────────────┼──────────────────────────┼───────────┤
│ │ Private use │ │
│ │--------------------------│ │
│ │ Non-standardized │ │
│ │ capabilities │ │
│ None │--------------------------│ 3 │
│ │ Session control │ │
│ │ functions │ │
│ │--------------------------│ │
│ │ Reason │ │
11 Fascicle VII.7 - Rec. T.521
└───────────────────────────────────┴──────────────────────────┴───────────┘
Fascicle VII.7 - Rec. T.521 12
TABLE 2-B/T.521
D-TERMINATE
w
┌──────────────────────────────┬────────────────────────────────┬───────────┐
│ DTAM service parameters │ Basic and additional │
Category │
│ │ session parameters │
│
├──────────────────────────────┼────────────────────────────────┼───────────┤
│ None │ Session termination parameter │ 3
│
└──────────────────────────────┴────────────────────────────────┴───────────┘
TABLE 2-C/T.521
D-U-ABORT
w
┌──────────────────────────────┬────────────────────────────────┬───────────┐
│ DTAM service parameters │ Basic and additional │
Category │
│ │ session parameters │
│
├──────────────────────────────┼────────────────────────────────┼───────────┤
│ User information (Note) │ Session termination parameter │ 1
│
│ │ (reason) │
│
├──────────────────────────────┼────────────────────────────────┼───────────┤
│ None │ Session termination parameter │ 3
│
│ │ (transport disconnect) │
│
└──────────────────────────────┴────────────────────────────────┴───────────┘
Note - This parameter is equal to reason of session termination parameter.
TABLE 2-D/T.521
D-U-CAPABILITY
w
┌───────────────────────────────────┬──────────────────────────┬───────────┐
│ DTAM service parameters │ Basic and additional │ Category │
│ │ session parameters │ │
├───────────────────────────────────┼──────────────────────────┼───────────┤
│ Application capabilities │ │ │
│ ----------------------------------│ │ │
│ | Document application profile │ │ │
│ |---------------------------------│ │ │
│ | Document architecture class │ Session user data │ 1 │
│ |---------------------------------│ │ │
│ | Non-basic document │ │ │
│ | characteristics │ │ │
├───────────────────────────────────┼──────────────────────────┼───────────┤
│ None │ Inactivity timer │ 2 │
├───────────────────────────────────┼──────────────────────────┼───────────┤
13 Fascicle VII.7 - Rec. T.521
│ │ Acceptance of CDCL │ │
│ │ parameters │ │
│ │--------------------------│ │
│ None │ Private use │ 3 │
│ │--------------------------│ │
│ │ Non-standardized │ │
│ │ capabilities │ │
└───────────────────────────────────┴──────────────────────────┴───────────┘
Fascicle VII.7 - Rec. T.521 14
TABLE 2-E/T.521
D-TRANSFER
w
┌──────────────────────────────┬────────────────────────────────┬───────────┐
│ DTAM service parameters │ Basic and additional │
Category │
│ │ session parameters │
│
├──────────────────────────────┼────────────────────────────────┼───────────┤
│ Document information │ Session user data │ 1
│
├──────────────────────────────┼────────────────────────────────┼───────────┤
│ Document information type │ None │
│
├──────────────────────────────┼────────────────────────────────┤ │
│ Document reference │ Document reference number │
│
│ information │ │ 1
│
├──────────────────────────────┼────────────────────────────────┤ │
│ Result │ None │
│
└──────────────────────────────┴────────────────────────────────┴───────────┘
TABLE 2-F/T.521
D-CONTROL GIVE
w
┌──────────────────────────────┬────────────────────────────────┬───────────┐
│ DTAM service parameters │ Basic and additional │
Category │
│ │ session parameters │
│
├──────────────────────────────┼────────────────────────────────┼───────────┤
│ None │ None
│ - │
└──────────────────────────────┴────────────────────────────────┴───────────┘
TABLE 2-G/T.521
D-TOKEN PLEASE
w
┌──────────────────────────────┬────────────────────────────────┬───────────┐
│ DTAM service parameters │ Basic and additional │
Category │
│ │ session parameters │
│
├──────────────────────────────┼────────────────────────────────┼───────────┤
│ None │ Tokens │ 2
│
└──────────────────────────────┴────────────────────────────────┴───────────┘
TABLE 2-H/T.521
15 Fascicle VII.7 - Rec. T.521
D-U-EXCEPTION-REPORT
w
┌──────────────────────────────┬────────────────────────────────┬───────────┐
│ DTAM service parameters │ Basic and additional │
Category │
│ │ session parameters │
│
├──────────────────────────────┼────────────────────────────────┼───────────┤
│ User information │ Reason │ 1
│
└──────────────────────────────┴────────────────────────────────┴───────────┘
6 Document interchange data structures
The interchange representation of a document has to be defined in accordance with
the Recom- mendation which specifies the relevant document application profile.
Fascicle VII.7 - Rec. T.521 16
7 Document transfer
7.1 Synchronization
The document information is divided into segments, in accordance with 7.2.4 of
Recommenda- tion T.433, such that each segment contains one page descriptor and the
associated content portion. A minor synchronization point is associated with each
segment.
7.2 Document transfer recovery
For further study.
ANNEX A
(to Recommendation T.521)
Overall protocol sequence
This Annex illustrates the following procedures provided by BT0 (see Figur s A-
1/T.521 to A-4/T.521):
- normal procedure;
- token control procedure;
- abort procedure;
- exception report procedure.
17 Fascicle VII.7 - Rec. T.521
CDCL Command document capability list
CDE Command document end
CDPB Command document page boundary
CDS Command document start
CDUI Command document user information
CSE Command session end
CSS Command session start
CSUI Command session user information
RDCLP Response document capacity list positive
RDEP Response document end positive
RDPBP Response document page boundary positive
RSEP Response session end positive
RSSP Response session start positive
RSUI Response session user information
FIGURE A-1/T.521
Normal procedure
Fascicle VII.7 - Rec. T.521 18
CSCC Command session change control
RSCCP Response session change control positive
RSUI Response session user information
FIGURE A-2/T.521
Token control procedure
CSA Command session abort
RSAP Response session abort positive
FIGURE A-3/T.521
Abort procedure
19 Fascicle VII.7 - Rec. T.521
CDD Command document discard
CDR Command document resynchronize
CSUI Command session user information
RDDP Response document discard positive
RDGR Response document general reject
RDPBN Response document page boundary negative
RDRP Response document resynchronize positive
RSUI Response session user information
FIGURE A-4/T.521
Exception report procedure
Fascicle VII.7 - Rec. T.521 20