1、CEPT T/CD*04-03*E 2 2326434 0003663 3 i1 TCD04-03 Page E 1 Recommendation T/CD 04-03 E (Vienna 1982, revised at Nice 1985) concerning safety requirements for the DTE-D.CE interface Recommendation proposed by Working Group T/GT 1 O “Data Communication” Text of the revised Recommendation adopted by th
2、e “Telecommunications” Commission: “The Conference of European Postal and Telecommunications Administrations, Considering That harmonisation of safety requirements has been studied by GT/CD in co-operation with the European Computer Manufacturers Association (ECMA) and the European Conference of Ass
3、ociations of Telecommunication Industries (EUC ATEL). Recommends That the following requirements be used in future DTE “Permission To Connect” procedures by CEPT Administra- tions and for the specification of DCEs by these Administrations.” This Recommendation is .the subject of further study and po
4、ssible amendment. This Recommendation is also published by ECMA as Standard ECMA-83, second edition. The text of the preface to this ECMA Standard is reproduced below for information. “Brief history. An initiative by ECMA resulted in a joint study with CEPT (European Conference of Posts and Telecomm
5、unications Administrations) conducted by rapporteurs from each organisation on the safety requirements at the interface between a DCE and a DTE (terminal) in a Public Data Network. The result was ECMA-83, 1982, simultaneously approved as CEPT Recommendation T/CD 04-03. The present revision resulted
6、from further study, with participation also from rapporteurs from EUCATEL (Euro- pean Conference of Associations of Telecommunication Industries) aimed at extending the scope to include the DTE-to-DCE interface on a telephone network. It contains identical requirements for both types of network, bas
7、ed on existing practice and experience on the telephone network. To achieve this commonality it was decided to modify the 1982 requirements to provide for touch-safe conditions at the interface. It is intended to publish further related agreements later.” 0 Edition of March 15, 1986 CEPT T/CD*04-03*
8、E 82 I 232b414 0003bb2 5 m I I I I I - I I I I I I l l DTE . T/CD 04-03 E Page 3 DCE 1. SCOPE This Recommendation specifies requirements to prevent electric shock hazards from existing at, or passing in either direction through, the interface connector between Data Terminal Equipment (DTE) and Data
9、Circuit terminating Equipment CE) in interchange circuits as defned in CCITT Recommendations V.24 and X.24. For defnition of DCE and DTE, reference is made to the CCITT book “Terms and Definitions”. V.24 or X.24 =/Network Scope of this Recommendation. The general safety of the equipment (e.g. for th
10、e operator) is not covered by this Recommendation, which is based on the assumption that the equipment meets the relevant standards for this purpose. The certification procedure, that is the way in which it is certified that a specific equipment design meets the requirements specified, is also not c
11、overed by this Recommendation. This Recommendation is a technical description for the DTE-to-DCE interface. It is applicable for connection of privately-owned DTE to Administration-owned DCE but its use with privately-owned DCE is not precluded. This Recommendation contains no requirements for the c
12、onnection points of a DCE to a telecommunication system (privately owned or Administration owned) with regard to safety of this system. Note: The requirements for the connection points of an Administration owned DCE to the telecommunication network are covered by CEPT Recommendation T/CD 01-01. Admi
13、nistrations may require precautions in addition to this Recommendation when the DTE-DCE interconnec- tion is to be established via PTT wiring. 2. REFERENCES IEC Publication 65 Safety requirements for mains operated electronic and related apparatus for household and similar general use. IEC Publicati
14、on 364-4-41 Electsical Installations of Buildings-Part 4 Protection for Safety-Chap- ter 41 Protection against Electric Shock. IEC Publication 380 Safety of electsically energized office machines. IEC Publication 435 Safety of Data Processing equipment. IEC Publication 664 Insulation Co-ordination w
15、ithin low voltage systems including clearancies and creepage distances for equipment. IEC Publication 664A First supplement to Publication 664. CEPT Recommendation T/CD 01-01 General Engineering requirements for Data Gircuit terminating equipment for analogue and digital networks. CCITT Volume X; Fa
16、scicle X.l Tenns and Definitions. In general, the edition of a publication which is applicable is the last one published. However when a revision occurs, compliance with either the latest edition or the previous edition is acceptable during an interim period. t ! Edition of March 15, 1986 CEPT T/CD*
17、04-03*E 82 = 232b414 0003bb3 7 T/CD 04-03 E Page 4 3. REQUIREMENTS V.24 and X.24 interchange circuits shall meet one of the following requirements: (a) SELV circuits as defined in IEC 380 or IEC 435; (b) SELV circuits as defined in IEC 364-4-41, not exceeding 25 Vrms or 60 Vdc; Note: IEC 664 and 664
18、A should be taken into account in designing these circuits; (c) circuits meeting the requirements for accessible terminals in IEC 65. Note 1: Use of the above circuits results in an interface that is safe to touch, whether it is accessible or not, since these circuits comply with the various require
19、ments in different IEC standards for parts and circuits permitted to be accessible to touch. This implies that they will not assume a hazardous voltage under normal conditions and single fault conditions. Note 2: Interconnection of equipment complying with this Recommendation to equipment that does
20、not comply should be avoided. Where such interconnection cannot be prevented the following should be noted. Earthed circuits will probably be unaffected by the other unit, whereas floating circuits, previously safe to touch, may be degraded. Where this possibility is to be avoided, earthed circuits are preferred. Edition of March 15, 1986
