1、p: a 00 3 I v1 B TIA/EIA TELECOMMUNICATIONS SYSTEMS BULLETIN The Mechanical/Functional Characteristics of the Interface Between DCEs and Voiceband Analog Channels TSB-18-A REAFFIRMED JUNE 2002 FEBRUARY 1988 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Teleconmiunications Industry Association represen
2、ts the conmiunications sector of Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NOTICE TIA/EIA Engineering Standards and Publications are designed to serve the public interest through e
3、liminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards and Publications shall not
4、 in any respect preclude any member or nonmember of TIA/EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by those other than TIA/EIA members, whether the standard is t
5、o be used either domestically or internationally. Standards, Publications and Bulletins are adopted by EIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, TIA/EIA does not assume any liability to any patent owner, nor does it assume any obligation w
6、hatever to parties adopting the Standard, Publication, or Bulletin. Technical Bulletins are distinguished from TIA/EIA Standards or Interim Standards, in that they contain a compilation of engineering data or information useful to the technical community, and represent approaches to good engineering
7、 practices that are suggested by the formulating committee. This Bulletin is not intended to preclude or discourage other approaches that similarly represent good engineering practice, or that may be acceptable to, or have been accepted by, appropriate bodies. Parties who wish to bring other approac
8、hes to the attention of the formulating committee to be considered for inclusion in future revisions of this Bulletin are encouraged to do so. It is the intention of the formulating committee to revise and update this Bulletin from time to time as may be occasioned by changes in technology, industry
9、 practice, or government regulations, or for other appropriate reasons. (From Project No. 3-2581, formulated under the cognizance of the TIA TR-30.3 Subcommittee on Data Communications Network Interfaces) This document was reaffirmed by the Telecommunications Industry Association on June 1 O, 2002.
10、Published by OTELECOMMUNICATIONS INDUSTRY ASSOCIATION 1988 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refer to the current Catalog of ELECTRONIC INDUSTRIES ALLIANCE STANDARDS and ENGINEERING PUBLICATIONS or call Global Engineering Documents, US
11、A and Canada (1 -800-854-71 79) International (303-397-7956) All rights reserved Printed in U.S.A. Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Electronic Industries Allianc
12、e Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NOTICE OF DISCLAIMER AND LIMITATION OF LIABILITY The document to which this Notice is affixed has been prepared by one or more Engineering Committees of the Telecommunications I
13、ndustry Association (“TIA”). TIA is not the author of the document contents, but publishes and claims copyright to the document pursuant to licenses and permission granted by the authors of the contents. TIA Engineering Committees are expected to conduct their affairs in accordance with the TIA Engi
14、neering Manual (“Manual”), the current and predecessor versions of which are available at http:/www.tiaonline.orZr/standards/sfZr/engineering manual.ch. TIAS function is to administer the process, but not the content, of document preparation in accordance with the Manual and, when appropriate, the p
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21、IA WITHOUT SUCH LIMITATIONS. Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a I c ip c * =* EIA TSBZB-A BB 3234bOO OOZLOO5 T E EIA 1- E L ECO M M U N I CAT ION S SYSTEMS BULLETIN The Me
22、chanical/ Funct ional Characteristics of the Interface Between DCEs and Voiceband Analog Channels TSB18-A FEBRUARY 1988 ELECTRONIC INDUSTRIES ASSOCIATION ENGINEERING DEPARTMENT - e Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or network
23、ing permitted without license from IHS-,-,-EIA TSBll-A m 3234600 OOLLOOb L m NOTICE 3 EIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of pr
24、oducts, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of auch Standards and Pub- lications shall not in any respect preclude any member or non-member of IA from manufacturing or selling products not conforming to such
25、Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by those other than EIA members, whether the standard is to be used either domestically or internationally. . Recommended Standards and Publications are adopted by EIA without regard t
26、o whether or not their adoption may involve patents on articles, materials, or processes. By such action, EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties, adopting the Recom- mended Standard or Publication. Published by ELECTRONIC INDUSTRI
27、ES ASSOCIATION Engineering Department 2001 Eye Street, N.W. Washington, D.C. 20006 / 7 Printed in U.S.A. .i) Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TSBLB-A 1.54 m 323400 OOL
28、LOO 3 m TELECOMMUNICATIONS SYSTEMS BULLETIN NO. 18-A The Mechanical /Functional Character ist ics of the Interface Between DCEs and Voiceband Analog Channels Prepared by TR-30.3 Subcommittee on Data Communication Network Interfaces Copyright Electronic Industries Alliance Provided by IHS under licen
29、se with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TSBL-A 8 m 3234600 OOLLOO 5 m c + TSB18 -A This Engineering Bulletin is being issued in advance of the Standard for the “INTERFACE BETWEEN DATA CIRCUIT TERMINATING EQUIPMENT (DCE) AND VOICEBAND ANALOG L
30、EASED LINES“ in order to provide manufacturers of DCEs with timely nformation on this interface. This information reflects agreements reached between EIA Technical Subcommittee TR-30.3 and the represent.atives of Exchange Telephone carriers. Equipment conforming to this interface is already availabl
31、e from many facility providers. This information will be incorporated in the Standard for t “INTERFACE BETWEEN DATA CIRCUIT TERMINATING EQUIPMENT (DCE) AND VOICEBAND ANALOG LEASED LINES“ when it is issued. i ie Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for Re
32、saleNo reproduction or networking permitted without license from IHS-,-,-c EIA TSBL-A 3234600 OOLLOO9 7 TSB18 -A Page 1 1.1 1.2 1.3 THE MEC“ICAL/FNCTIONAL, CHARACTERISTICS OF THE INTERFACE BETWEEN DCEs AND VOICEBAND ANALOG CHANNELS The interface between the DCE and the analog leased line is located
33、at a pluygable connector. An 8-position keyed modular jack (female) is specified for the network side of this interface. The plug (male) associated with the DCE can either be keyed or unkeyed. To alleviate cross-talk, ft is recommended that twisted pairs be used for interface cords exceeding 15 feet
34、 in length. The interchange circuits, with their associated pin-pair relationships, shall be assigned in accordance with Table 1 below (see Figure i). DCE MANUFACTURERS SHOULD BE CAUTIONED THAT THIS CONNECTOR IS USED IN A VARIETY OF APPLICATIONS AND THEREFORE UNSPECIFIED POTENTIALS COULD BE FOUND ON
35、 ANY BEEN ASSIGNED FOR OPTIONAL POWERING ARRANGEMENTS IN I SDN. OF THESE PINS. SPECIFICALLY, PINS 1 8 2 AND 7 8 8 HAVE PA IR/PIN 1/1* 1 /2* il/3* 3/4 3/5 2/6* 4/7 4/8 INTERCHANGE CIRCUIT - FROM DCE Transmit Signal (RI) X Transmit Signal (Tl) X TEK5 Loopback Indicator X Reserved Reserved TEK6 Loopbac
36、k Indicator X Receive Signal (T) X Receive Signal (RI X Table 1 - Interchange Circuit Assignments * This pair is used. for 2-wire access. * When provided, an open circuit between TEK5 and TEK6 Indicates that. the line is not available for transmission. This may be caused either by a loopback of the
37、leased line towards the cent.ra1 office or an out of service condition. Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TSBL8-A 88 m 3234600 OOLlOLO 3 m 1SH.I 8 -A Page 2 Fiyuie 1 - Eight-Position Plug 8 Jack Mechanical Configuration Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
