150 2110 89 INTERNATIONAL ISO STANDARD 2110 Third edition 1989-10-01 AMENDMENT1 1991-09-15 Information technology - Data communication -- 25-pole DTE/DCE interface connector and contact number assignments AMENDMENT 1: Interface connector and contact assignments for a DTE/DCE interface for data signalling rates above 20 000 bit/s Technologies de I'information - Communication de donnees - Connecteur d'interfaceETTD/ETCDa25polesetaffectationdesnumérosdecontacts AMENDEMENT1:Connecteurd'interfaceetaffectationdesnumerosdecontactsa I'interface ETTD/ETCDpour un debit binaire superieura 20kbit/s Referencenumber ISO 2110 : 1989/Amd.1 : 1991 (E) reproduction or networking permitted without license from IHS Not for Resale 5he60t0 E06t59h 69 0tT2 0s1 ISO2110:1989/Amd.1:1991(E) Foreword ISo (the international Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardiz- ation. National bodies that are members of iSO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with Iso and IEc, also take part in the work. In the field of information technology, Iso and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technicai committee are circulated to national bodies for voting. Publication as an InternationalStandard requiresapproval byat least75%ofthenationalbodiescasting a vote. Amendment 1 to International Standard Is0 2110 : 1989 was prepared by Joint Technical Committee ISo/IEC JTC 1, Information technology. AnnexBofthisAmendmentisforinformationonly @ ISO/IEC 1991 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office · Case postale 56. CH-1211 Geneve 20. Switzerland Printed in Switzerland Copyright International Organization for Standardizatior etworking permitted without license from IHS Not for Resale 150211089 485190301098460 ISO 2110 : 1989/Amd.1 : 1991 (E) Information technology Data communication - 25-pole DTE/DCE interface connector and contact number assignments AMENDMENT 1 : Interface connector and contact assignments for a DTE/DCE interface for data signalling rates above 20 000 bit/s Page 1 Pages 4 and 5 Clause 1 Table 1 Add the following column and add the following notes: Add the following: "In the case where operation exceeding 20000bit/s is M required, the electrical characteristics shall be in accordance Operationabove with CCITT Recommendation V.10 and CCITT Recommen- 20 000 bit/s13) dation V.11." 1 2 103-A Clause 2 3 104-A 4 105-A/133-A Insert thefollowingafter "CCITT Recommendation 5 106-A S.16:1989": 6 10715) 102-A 8 109-A "CCITT Recommendation V.10: 1988,Electrical characteristics 9 115-B for unbalanced double-circuit interchange circuits for general 10 109-B usewith integrated circuit equipment in the fieldofdata com- 11 113-B munications. 12 114-B 13 106-B 14 103-B CCITT Recommendation V.11 : 1988, Electrical characteristics 15 114-A for balanced double-circuit interchange circuits for general use 16 104-B with integrated circuit equipment in the field of data com- 17 115-A munications," 18 14115) 19 105-B/133-B 20 10815) 14015) 12515) 134 102-B 113-A 25 142 Electrical V.11/V.1014) characteristics 13 Reference to the appropriate V. Series Recommendation(s) to be added when CCITT specifies the use of these electrical characteristics in the said Recommendations. 14 Equipment designers shall take note of the fact that the predominant use of this connector is in devices using electrical charact