1、 STD.1Tl.J-T RECMN T.521 AND 1-ENGL 1775 LiBb257L Ob3b7bd b27 INTERNATIONAL TELECOMMUNICATION UNION ITU=T TEL ECO M MU N I CAT I ON STANDARDIZATION SECTOR OF ITU Amendment 1 TERMINALS FOR TELEMATIC SERVICES T.521 (08/95) COMMUNICATION APPLICATION PROFILE BTO FOR DOCUMENT BULK TRANSFER BASED ON THE S
2、ESSION SERVICE Amendment 1 to ITU-T Recommendation T.521 (Previously “CCITT Recommendation”) FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, operating and tariff qu
3、estions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Re
4、commendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1 - 12, 1993). Amendment 1 to ITU-T Recommendation T.521, was prepared by ITU-T Study Group 8 (1993-1996) and was approved under
5、the WTSC Resolution No. 1 procedure on the 1 lth of August 1995. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1995 All rights reserved. No part of this publication may
6、 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. 1 Subclause CONTENTS Page 1 3.1.5 should be amended as follows . 2 Subclause 5.3.1.6 should be amended as follows . 2 3 Modify Table 2-D
7、 as follows . 3 Recommendation T.521 / Amd.1 (08/95) 1 STD-ITU-T RECMN T-521 AND 1-ENGL 1775 4862573 Ob3b771 111 SUMMARY Recommendation T.52 1 defines communication application profile for G4 facsimile apparatus. This amendment contains the definition of parameters for file transfer added as an opti
8、onal function. I1 Recommendation T.521 / Amd.1 (08/95) - Amendment 1 to Recommendation T.521 COMMUNICATION APPLICATION PROFILE BTO FOR DOCUMENT BULK TRANSFER BASED ON THE SESSION SERVICE (1 995) 1 Subclause 5.3.1.5 should be amended as follows: 5.3.1.5 D-CAPABILITY service parameters This service ha
9、s the sub-parameter “ODA Application capabilities” which consists of the following parameters: - document application profile; - document architecture class; - non-basic document characteristics; - additional document characteristics. Table 1 -B lists the D-CAPABILITY service parameters. 1) Applicat
10、ion capabilities See 5.3.1.1. ODA Application capabilities: 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 parameter “Non-basic document characteristics” defined in Recommendation T.432. d) Additional documen
11、t characteristics This is the parameter “Additional document characteristics” defined in Recommendation T.432. e) File transfer capabilities This is the parameter “File transfer capabilities” defined in Recommendation T.432. f) Private capabilities This is the parameter “Private capabilities” define
12、d in Recommendation T.432. Recommendation T.521 / Amd.1 (OW95) 1 STD-ITU-T RECMN T.521 AMD 1-ENGL 1775 m 4b2591 Ob3b773 T94 D-CAPABILITY response M M U U U U TABLE 1 -B/T.52 I D-CAPABILITY confirm M(=) M(=) C(=) C(=) C(=) C(=) D-CAPABILITY service parameters ODA Application capabilities I Document a
13、pplication profile I Document architecture class I Non-basic document characteristics I Additional document characteristics 1 File transfer capabilities I Private capabilities . I I I I I D-CAPABILITY request M M U U U U D-CAPABILITY indication 2 Subclause 5.3.1.6 should be amended as follows: 5.3.1
14、6 TRANSFER service parameters This service has the following parameters: 1) Document information This parameter consists of the interchange data elements representing the document. The “Document characteristics” from the document profile are transferred using S-ACT-START service. All interchange da
15、ta elements, except the document profile descriptor, are transferred using S-DATA- services. The document profile is reconstructed by the received DTAM-PM, on the basis of the “Document characteristics” transferred in the S-ACT-START service. 2) Document information type This parameter has the value
16、 “transfer of a document f-om its beginning” in the request primitive (see Recommendation T.432). For the indication and confirm primitive, the value is either “transfer completed” or “transfer not completed”. 3) Document reference information The value of this parameter is to be provided by the DTA
17、M user in accordance with the rules specified in Recommendation T.432. 4) Result This parameter has one of the values “document information transferred” or “document information not completely transferred”, as defined in Recommendation T.432. NOTE -The parameter value “document-information-continuat
18、ion not possible” is for further study. 5) Checkpoint value This parameter is used as defined in Recommendation T.432. The number of IDE per segment is integer 2. However, the document profile and the document root are not counted (see Figure 1). In case of file transfer function, this parameter is
19、used as defined in Recommendation T.432 (see Figure 2). 2 Recommendation T.521 / Amd.1 (08/95) The following restriction is applied to the transfer syntax coding rules defined in Recommendation X.209 for the interchange of the document application profile defined in Recommendation T.503: Length fiel
20、ds 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. - None None Checkpoint value = n (see 5.3.1.5) . Storage capacity P
21、rivate use (Note) Non-standardized capabilities . ) characteristics Document 1 TI , Il - Segmented 1024.n 1024 O C data size c =1024*n I I S-ACT-START-req. I S-MINOR- SWC-req. S-MINOR- SYNC-req. S-ACT-EN D-req. S-DATA-req. S-DATA-req. S-DATA-req. S-DATA-req S-DATA-req. S-DATA-req. TO820060-95/dO 1 F
22、IGURE 2/T.521 Application of the segmenting mechanism as defined in Figure 2T.433 3 Modify Table 2-D as follows TABLE 2-D/T.52 1 D-CAPABILITY DTAM service parameters IDA-Application capabilities .-.-_- Document application profile Document architecture class Non-basic document characteristics Additi
23、onal document characteristics File transfer capabilities Private capabilities .-_-_._- .-_-_- .-_-_- .-_I_- -_-_._- Basic and additional session service parameters Session user data Presence in session protocol m Category 1 NOTE - In case of file transfer, this parameter is used in accordance with the rules defined in Recommendation T.571. The use for facsimile Group 4 is for further study. Recommendation T.521 / Amd.1 (08/95) 3
