1、STD-ITU-T RECMN X*IB-ENGL Ll7b 48b257L Ob24521 041 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUN KATION STANDARDIZATION SECTOR OF ITU X.38 (I 0/96) SERIES X: DATA NETWORKS AND OPEN SYSTEM CO MM U N I CATI ON Public data networks - Interfaces G3 facsimile equipmentlDCE interface for G3 facsi
2、mile equipment accessing the Facsimile Packet AssemblylDisassembly facility (FPAD) in a public data network situated in the same country ITU-T Recommendation X.38 (Previously “CCIlT Recommendation”) - STD-ITU-T RECMN X.3A-ENGL L99b qBb257L ObZi522 TAB ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND
3、 OPEN SYSTEM COMMUNICATION UBLIC DATA NETWORKS Services and facilities X. 1-X.199 X. l-X. 19 Transmission, signalling and switching Network aspects Maintenance Administrative arrangements Model and notation Service definitions Connection-mode protocol specifications Connectionless-mode protocol spec
4、ification PXCS proformas Protocol Identification Security Protocols Layer Managed Objects Conformance testing General Satellite data transmission systems MESSAGE HANDLING SYSTEMS DIRECTORY OS1 NETWORKING AND SYSTEM ASPECTS )PEN SYSTEM INTERCONNECTION NTERWORKING BETWEEN NETWORKS Networking Efficienc
5、y Naming, Addressing and Registration Abstract Syntax Notation One (ASN. 1) Systems Management framework and architecture Management Communication Service and Protocol Structure of Management Information Management fwictions OS1 MANAGEMENT SECURITY OS1 APPLICATIONS Commitment, Concurrency and Recove
6、ry Transaction processing Remote operations OPEN DISTRIBUTED PROCESSING X.50-X.89 X.90-X.149 X.150-X. 179 X.180-X.199 X.200-X.299 X.200-X.209 X.2 10-X.219 X.220-X.229 X.230-X.239 X.240-X.259 X.260-X.269 X.270-X.279 X.280-X.289 X.290-X.299 X.300-X.399 X.3 00-X.349 X.350-X.399 X.400-X.499 X.500-X.599
7、X.600-X.699 X.600-X.629 X.630-X.649 X.650-X.679 X.680-X.699 X.700-X.799 X.700-X.709 X.710-X.719 X.720-X.729 X.730-X.799 X.800-X.849 X.850-X.899 X.850-X.859 X.860-X.879 X.880-X.899 X.900-X.999 For further details, please refer to ITU-T List of Recommendations. STD-ITU-T RECMN X-3B-ENGL L99b m 4b259L
8、Ob24523 71Y 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 questions and issuing Recommen- dations on them with a view to standardizing teleco
9、mmunications 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 Recommendations on these topics. The approval of Recommendations by the Members of
10、the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation X.38 was revised by ITU-T Study Group 7 (1993-1996) and was approved under the WTSC Resolution No, 1 procedure on the 5th of October 1996. NOTE In this Recommendation, the expr
11、ession “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1997 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopyi
12、ng and microfilm, without permission in writing from the ITU. Recommendation X.38 (10/96) 1 STD-ITU-T RECMN X-38-ENGL L77b 9Bb257L Ob29529 850 CONTENTS Page Preface . Procedures for the establishment of a national Access Information Path (AIP) between a G3 facsimile 1.1 1.2 1.3 equipment (G3FE) and
13、an FPAD . Access from a G3 facsimile equipment to an FPAD Access from an FPAD to a G3 facsimile equipment Procedures for service initialization between a G3 facsimile equipment and an FPAD 2.1 Exchange of control information between a G3 facsimile equipment and an FPAD . 2.2 Procedures for initializ
14、ation Procedures for the exchange of control information between a G3 facsimile equipment and an FPAD . 3.1 General 3.2 Procedures for virtual call control 3.3 Procedure for FPAD commands . 3.4 Formats of FPAD command signals and FPAD service signals . Procedures for the exchange of facsimile image
15、data between a G3 facsimile equipment and an FPAD . 4.1 Facsimile procedure (state 5) 4.2 Receiving capability notification in DIS or DTC command . 4.3 Non-standard facilities 4.4 Procedure upon receipt of procedure interrupt command or response . 4.5 Determination of data signalling rate 4.6 Facsim
16、ile image data from the G3 facsimile equipment received by the FPAD 4.7 Delivery of user data to the G3 facsimile equipment 4.8 Data forwarding conditions 4.9 Procedure for the FPAD to indicate to the G3 facsimile equipment a temporary inability to accept additional information Manual operation both
17、 at the emitting and receiving G3 facsimile equipments . - . Annex A . FPAD command signals and FPAD service signals . Annex C - State diagrams . Annex D - Support of non-standard facilities . Annex E -Access to MHS E.l Introduction E.2 References E.3 Principles of the enhancements of X.38 to allow
18、MHS access . E.4 Message-submission operation . ES Message-delivery operation E.6 Command operation E.8 E.9 E . 10 Annex B - FPAD time-outs E.7 Report operation . Facility block and address block . Table of the facility request codes Specific FPAD service signals for MHS access . Annex F - Alphabeti
19、cal list of abbreviations used in this Recommendation Appendix I - Examples of event sequence 11 Recommendation X.38 (10/96) 1 1 2 2 4 4 4 4 5 5 6 11 11 14 14 20 20 20 21 22 23 23 23 25 28 29 37 39 39 39 39 40 43 43 45 46 46 46 48 49 - STD*ITU-T RECMN X.38-ENGL L77b 48b2571 Ob24525 777 Recommendatio
20、n X.38 G3 FACSIMILE EQUIPMENTDCE INTERFACE FOR G3 FACSIMILE EQUIPMENT ACCESSING THE FACSIMILE PACKET ASSEMBLYDISASSEMBLY FACILITY (FPAD) IN A PUBLIC DATA NETWORK SITUATED IN THE SAME COUNTRY (Geneva, 1991; revised in 1996) Preface The establishment in various countries of public data networks provid
21、ing packet switched data transmission services creates a need to produce standards to facilitate G3 facsimile equipment access from the telephone network. The ITU-T, considering (a) network and Recommendation X.96 defines call progress signals; that Recommendations X. 1 and X.2 define user classes o
22、f service and user facilities provided by a public data (b) interworking between FPADs; that Recommendation X.39 defines procedures for a packet mode DTE to control the FPAD and for (c) data network; that Recommendation X.5 defines the Facsimile Packet AssemblyDisassembly (FPAD) facility in a public
23、 (dl dation X.92; that the logical control links for packet switched data transmission services are defined in Recommen- (e) that G3 facsimile or associated equipments may send and receive network control information and user information in the form of dual-tone multi-frequency codes defined in Reco
24、mmendation 4.23 or signals defined in Recommendations T.4 and T.30, unanimously declares that the necessary elements for an interface Recommendation should be as defined independently as: (a) equipment and an FPAD; Clause 1: Procedures for establishment of a national access information path between
25、a G3 facsimile (b) Clause 2: Procedures for service initialization between a G3 facsimile equipment and an FPAD; (cl an FPAD; Clause 3: Procedures for the exchange of control information between a G3 facsimile equipment and (d) an FPAD. Clause 4: Procedures for the exchange of facsimile image data b
26、etween a G3 facsimile equipment and 1 Procedures for the establishment of a national Access Information Path (AIP) between a G3 facsimile equipment (G3FE) (see Note) and an FPAD NOTE - The term G3 facsimile equipment used in this Recommendation is slightly different from the T-Senes Recommendations.
27、 In this Recommendation it is taken to be a G3 facsimile equipment which conforms to Recommendations T.4 and T.30, along with the necessary ancillary control device as described in 2.1.1. Recommendation X.38 (10/96) 1 Two different access information paths are defmed: - from a G3 facsimile equipment
28、 to an FPAD; and - from an FPAD to a G3 facsimile equipment. In each case, the G3 facsimile equipment may be connected directly to an FPAD or may be connected to the FPAD via the General Switched Telephone Network (GSTN). Recognizing that the insertion of a FPAD on the GSTN may result in limitations
29、 on the interchange of facsimile images between Group 3 facsimile terminals, the introduction of the FPAD should only occur as the result of an explicit act by either the call originator or the call recipient. 1.1 Access from a G3 facsimile equipment to an FPAD 1.1.1 1.1.1.1 Two-stage dialling For a
30、n equipment connected to the GSTN - For two-stage dialling, the establishment of the call is based on manual operation of the G3 facsimile equipment, although automatic operation may also be feasible. The calling equipment accesses an FPAD by dialling a number assigned to the FPAD. When the FPAD ans
31、wers the call, the state of the FPAD changes from the disconnected state to the active link state (2.2.2) (when FPAD parameter 1 is not set to O) or to the FPAD waiting state (3.2.1 .I) (when FPAD parameter 1 is set to O). 1.1.1.2 One-stage dialling For one-stage dialling, the establishment of a cal
32、l is realized through either manual or automatic operation of the G3 facsimile equipment. The FPAD to which the calling G3 facsimile equipment is connected behaves as a called equipment operating automatically. (See Recommendation T.30 operating methods 2 and 4.) The calling G3 facsimile equipment d
33、ials the number of the called facsimile equipment, but instead of establishing a connection with the called equipment, the GSTN routes the call to an FPAD. The means by which the GSTN determines that the call can be routed to an FPAD, and the means by which the called equipment is identified to the
34、FPAD are local matters. Once the FPAD has received the dial number of the called equipment from the GSTN, the state of the FPAD changes from disconnected state (2.2. I) to connection-in-progress state (3.2.1.4). 1.1.2 The calling G3 facsimile equipment may operate manually or automatically. In the c
35、ase of an equipment operating automatically, the FPAD is required to emulate the GSTN. Therefore the FPAD must provide dial tone and other service signals as defined in 3.4.2. For a directly connected equipment After the calling G3 facsimile equipment goes off-hook, the state of the FPAD immediately
36、 changes from the discon- nected state (2.2.1) to the active link state (2.2.2) (when FPAD parameter 1 is not set to O) or to the FPAD waiting state (3.2.1.1) (when FPAD parameter 1 is set to O). 1.2 Access from an FPAD to a G3 facsimile equipment 1.2.1 The procedures are as defined in Recommendatio
37、n T.30 for call establishment between a calling equipment operating automatically and a called equipment operating either manually or automatically (i.e. operating methods 3 and 4). For an equipment connected to the GSTN The address of the called equipment is derived from the called address field of
38、 the incoming call packet. It is the responsibility of the FPAD to derive a dial number which is consistent with both the context of the FPAD and the local requirements of the GSTN. Upon receipt of a CED signal or (CS1)-DIS command from the called G3 facsimile equipment, the interface enters the fac
39、simile procedure state (4. I). 2 Recommendation X.38 (10/96) NOTE - In the balance of this Recommendation, (NSF) may preceed (CS1)-DIS. The handling of non-standard facilities is described in 4.3. 1.2.2 1.2.2.1 FPAD procedures An FPAD will emulate the actions of the GSTN in establishing the access i
40、nformation path to a directly connected facsimile equipment. The actions specific to the FPAD are defined in Figure 1. The address of the called equipment (represented by the called address field in the incoming call packet) is used by the FPAD to identify the directly connected equipment. For a dir
41、ectly connected equipment -. . Send ring Yes CED or (CSI)-DIS? 4 Facsimile procedure Timer T Elapsed? Yes Disconnect T0707850-92dOl NOTE - The actual number of rings is a national matter. FIGURE 1X.38 Call establishment from an FPAD to a directly connected facsimile equipment (FPAD procedures) 1.2.2
42、.2 Called G3 facsimile equipment procedures The procedures are as defined for the called equipment in Recommendation T.30 for call establishment between a calling equipment operating automatically and a called equipment operating either manually or automatically (ie. the called equipment procedures
43、of operating methods 3 and 4). Recommendation X.38 (10/96) 3 - STD-ITU-T RECMN X-IA-ENGL L77b U 48b2.571 0b2.4528 4Tb m 1.3 A manual operation (operating method 1) both at the emitting and receiving G3 facsimile equipments will be realized by the combination of manual-automatic operation (operating
44、method 2) between an emitting G3 facsimile equipment andFPAD and automatic-manual operation (operating method 3) between a receiving FPAD and G3 facsimile equipment. Manua1,operation both at the emitting and receiving G3 facsimile equipments It should be noted that true manual-to-manual (Mode 1) ope
45、ration cannot be realized when using FPADs due to verbal exchange not being possible. However, manual-to-manual (Mode 1) is effected with FPADs by the use of back-to-back Method 2 t) Method 3 (Manual to Automatic t) Automatic to Manual) operation. 2 Procedures for service initialization between a G3
46、 facsimile equipment and an FPAD 2.1 Exchange of control information between a G3 facsimile equipment and an FPAD In order for a G3 facsimile equipment to exchange an FPAD command signal (see 3.1.2), an ancillary signalling method is needed between a G3 facsimile equipment and an FPAD. 2.1.1 Use of
47、ancillary signalling methods The FPAD may accept control information through the following ways: - dual-tone multi-frequency (DTMF) codes generated by the G3 facsimile equipment or by an external device; association of other equipment (e.g. videotex) with the G3 facsimile equipment; pre-message and/
48、or post-message processing, perhaps, using the V.2 1 modulation scheme; - - - optical character recognition; - optical mark recognition; or - other methods. The selection of one or more ancillary signalling methods is left as a national matter. 2.1.2 Ancillary signalling method 1: dual-tone multi-fr
49、equency (DTMF) codes In view of the availability of DTMF generators already associated with existing G3 facsimile equipment, ancillary signalling method 1 : DTMF codes are provided. The G3 facsimile or associated equipment shall generate Dual-Tone Multi-Frequency (DTMF) codes O to 9, star (*) and square (#)I described in Recommendations 4.23 and V.19. The FPAD shall expect to receive DTh4F codes. This code format applies to the procedures described in clause 3. 2.2 Procedures for initialization The references to states in the following procedures correspond to the sta
