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1、ANSI INCITS 189-1991 (R2002) (formerly ANSI X3.189-1991 (R1997) for Information Systems Interface between Data Terminal Equipment (DTE) and Data Circuit-Terminating Equipment (DCE) for Terminals Operating in the Packet Mode and Accessing a Packet-Switched Public Data Network Through Switched Access
2、Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/09/2007 00:43:56 MDTNo reproduction or networking permitted without license from IHS -,-,- American National Standard Approval of an Americ
3、an National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by dir
4、ectly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The use of American National Standards is
5、 completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not dev
6、elop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretatio
7、ns should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically t
8、o reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by American National Standards Institute 11 West 42nd Street, New York, New York 10036
9、Copyright 1992 by Information Technology Industry Council (ITI) All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of ITI, 1250 Eye Street NW, Washington, DC 20005. Printed in the United Sta
10、tes of America Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/09/2007 00:43:56 MDTNo reproduction or networking permitted without license from IHS -,-,- Approved June 4, 1991 American Na
11、tional Standards Institute, Inc. American National Standard for Information Systems Interface between Data Terminal Equipment (DTE) and Data Circuit-Terminating Equipment (DCE) for Terminals Operating in the Packet Mode and Accessing a Packet-Switched Public Data Network Through Switched Access ANSI
12、 Secretariat Computer and Business Equipment Manufacturers Association X3.189-1991 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/09/2007 00:43:56 MDTNo reproduction or networking permit
13、ted without license from IHS -,-,- ii Contents Page Foreword iii 1Scope. 1 2Normative references 1 3Requirements . 2 Annexes ADTE-to-DTE operation. 6 BModem characteristics facility7 CAcronyms. 8 ii Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN
14、Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/09/2007 00:43:56 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Foreword(This foreword is not part of American National Standard X3.189-1991.) This standard was developed by Task Group X3S3.7, Public Digital N
15、etwork Access, in close cooperation with the International Telegraph and Tele- phone Consultative Committee (CCITT). Task group X3S3.7 started its work on public data network access protocols in 1973 and contributed to the international work of CCITT in this area. Initial access to public data netwo
16、rks was by way of dedicated lines. Work in CCITT on switched access to public data networks started in 1983 and resulted in the adoption of Recommendation X.32 in 1984. Task Group X3S3.7 was responsible for significant input to this work through the U.S. CCITT Study Group D, which is responsible for
17、 the U.S. contributions to the CCITT in the area of data communications. To meet the need for switched access to public data networks to meet the unique requirements of the U.S. environment, the task group determined that Recommendation X.32 should serve as the basis for an American National Standar
18、d for such applications. The draft proposed American National Standard was submitted to ANSI Technical Committee X3S3 to start the approval process according to ANSI procedures. The process was successfully completed, resulting in ANSI X3.189-1991. This standard contains three annexes. Annexes A and
19、 B are normative, and are considered part of this standard. Annex C is informative, and is not considered to be part of this standard. Suggestions for the improvement of this standard will be welcome. They should be addressed to the Computer and Business Equipment Manufactur- ers Association, 311 Fi
20、rst Street, NW, Suite 500, Washington, DC, 20001. This standard was proposed and approved for submittal to ANSI by Ameri- can National Standards Committee on Information Processing Systems, X3. Committee approval of the standard does not necessarily imply that all committee members voted for its app
21、roval. At the time it approved this standard, the X3 Committee had the following members: Richard Gibson, Chairman Donald C. Loughry, Vice-Chairman Joanne Flanagan, Administrative Secretary Organization RepresentedName of Representative Allen-Bradley Company Ronald R. Reimer American Library Associa
22、tion Paul Peters American Nuclear Society Geraldine C. Main AMP, Inc Edward Kelly Patrick Lannon (Alt.) Apple Karen Higginbottom Association of the Institute for Certification of Computer Professionals (AICCP) Kenneth Zemrowski Eugene M. Dwyer (Alt.) AT data link layer control procedure; packet laye
23、r procedures; specifications for and support of X.32 op- tional user facilities; and specifications for calling and called ad- dresses. 3.1 Physical layer At the physical layer, the provisions of section 4 of CCITT Recommendation X.32 apply, sub- ject to the following. 3.1.1 Physical interface For a
24、 description of the physical layer interface for the case of ISDN transparent circuit con- nection, see CCITT Recommendation X.31. For establishment, maintenance, and dises- tablishment of a switched access path between a DTE and a PSPDN by way of a PSTN, the physical layer interface shall be descri
25、bed in the following points of this section. 2 on the general switched telephone network and on point-to-point 2-wire leased telephone- type circuits 2), 3) CCITT Recommendation V.24 (1988), List of definitions for interchange circuits between data terminal equipment and data circuit-terminat- ing e
26、quipment 2), 3) CCITT Recommendation V.25 (1988), Auto- matic answering equipment and/or parallel automatic calling equipment on the general switched telephone network including proce- dures for disabling the echo control devices for both manually and automatically established calls 2), 3) CCITT Rec
27、ommendation V.25bis (1988), Au- tomatic calling and/or answering equipment on the general switched telephone network (GSTN) using the 100-series interchange cir- cuits 2), 3) CCITT Recommendation V.28 (1988), Electri- cal characteristics for unbalanced double-cur- rent interchange circuits 2), 3) CC
28、ITT Recommendation V.32 (1988), A family of 2-wire, duplex modems operating at data signaling rates of up to 9600 bit/s for use on the general switched telephone network and on leased telephone-type circuits 2), 3) CCITT Recommendation V.35 (1984), Data transmission at 48 kilobits per second using 6
29、0-108 kHz group band circuits 2), 3) CCITT Recommendation V.54 (1988), Loop test devices for modems 2), 3) CCITT Recommendation X.1 (1988), Interna- tional user classes of service in public data networks and integrated services digital net- works 2), 3) CCITT Recommendation X.2 (1988), Interna- tion
30、al data transmission services and optional user facilities in public data networks. 2), 3) CCITT Recommendation X.10 (1988), Catego- ries of access for data terminal equipment (DTE) to public data transmission services pro- vided by PDNs and/or ISDN through terminal adapters 2), 3) CCITT Recommendat
31、ion X.25 (1988), Inter- face between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedi- cated circuit 2), 3) Copyright American National Standards Institute Provided by IHS under license
32、 with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/09/2007 00:43:56 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 ANSI X3.189-1991 3.1.2 Modem characteristics Public Data Networks may choose to offer modem characteristics operating in th
33、e syn- chronous mode in accordance with any or all of the following: a) 2400/1200 bits/sV.22 bits, modes (i) or (iii) b) 9600/4800 bits/s V.32 c) 300, 1200 bits/sBell 212A The national default modem characteristic for unregistered dial-out is V.22 bis. 3.1.3 Procedures for full duplex opera- tional
34、phases Procedures for full duplex operation shall be in accordance with 4.3.2 of CCITT Recommen- dation X.32. 3.2 Data link layer This section specifies the data link layer proce- dures that are employed to support switched access data interchange between a DCE and a DTE. The provisions of section 5
35、 of CCITT Recommendation X.32 apply, subject to the following. 3.2.1 Compatibility with the HDLC bal- anced classes of procedure The switched access data link layer proce- dures defined in this standard use the prin- ciples and terminology of the High-Level Data Link Control (HDLC) Procedures. (See
36、5.1.1 of CCITT Recommendation X.32 and 2.2., 2.3, and 2.4 of CCITT Recommendation X.25.) 3.2.2 Data link procedures The single link procedure (SLP) shall be sup- ported. 3.2.3 Data link layer address assignment Data link layer address assignment shall be in accordance with the specifications in 2.4.
37、2 of CCITT Recommendation X.25, in which the data link layer address assignment depends on the roles of the equipment as DTE and DCE such that the DCE transmits to the DTE the address A in command frames and the address B in response frames and the DTE does the opposite (i.e., transmits to the DCE a
38、ddress B in command frames and address A in response frames). 3.3 Packet layer The formats and the procedures at the packet layer shall be in accordance with sections 3, 4, 3 5, 6, and 7 of CCITT Recommendation X.25 and section 6 of CCITT Recommendation X.32, subject to the following. 3.3.1 Use of r
39、egistration packets for iden- tification of DTE and/or DCE and for con- veyance of X.32 optional user facilities The use of registration packets for identifica- tion or for the conveyance of X.32 optional user facilities, or for both purposes, shall be in accordance with 6.2 of CCITT Recommenda- tio
40、n X.32. 3.3.2 Identification and authentication of the DTE using the NUI Selection facility in call set-up packets The use of the NUI Selection facility for identi- fication and authentication shall be in accor- dance with 6.3 of CCITT Recommendation X.32. 3.4 Identification protocol The procedures
41、for the use of the identification protocol shall be in accordance with section 7 of CCITT Recommendation X.32. 3.5 Functional aspects The functional aspects for dial-in and dial-out operation shall be in accordance with section 2 of CCITT Recommendation X.32, subject to the following. 3.5.1 Support
42、of service for dial-in-by-the- DTE operation Networks shall support the provision of nonidentified service and identified service for dial-in-by-the-DTE operation. 3.5.2 Transmission facility The transmission facility is duplex. Support of half-duplex operation is not addressed by this standard. 3.5
43、.3 Support of identification by means of NUI for dial-in Networks shall support identification by means of the NUI Selection facility in call request packets. This method shall be supported for the dial-in-by-the-DTE. Networks shall provide identified service to a DTE identified by means of the NUI
44、Selection facility in accordance with 2.3.2.2 and 3.4 of CCITT Recommendation X.32. Other methods of DTE identification in accordance with 2.4 of CCITT Recommenda- tion X.32 are optional. Networks may option- ally offer NUI Override with a user selectable Copyright American National Standards Instit
45、ute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/09/2007 00:43:56 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 ANSI X3.189-1991 X.25 subscription set as part of identified ser- vice. This shall be done
46、 by means of the NUI Selection facility in the call request packet in accordance with 2.3.2.2 and 6.3 of CCITT Rec- ommendation X.32. 3.5.4 Optional aspects of X.32 Additionally, those services/attributes defined as optional in CCITT Recommendation X.32 will be optional within this standard. 3.6 Ser
47、vice attributes “Attributes“ are defined to describe each as- pect of switched access service. However, the values of the attributes do not necessarily in- clude all capabilities offered to PSPDN users that access the PSPDN via a leased line. For each DTE service, (i.e., Nonidentified, Identi- fied,
48、 and Customized), each attribute is either not provided, or if provided, is set to a default value specified by the network or set to a value by the user from a set of values provided by the network. Not all of these attributes may be offered by the network. 3.6.1 DTE identity DTE identity is the id
49、entity agreed upon be- tween the user and the Public Data Network. Support of DTE identity shall be in accordance with 2.2.1 and 3.1.1 of CCITT Recommenda- tion X.32. 3.6.2 DTE identification methods The DTE identification method defines the method used for establishing the DTE identity. CCITT Recommendation X.