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Minutes of Proceedings This electronic version (PDF) was scanned by the International Telecommunication Union (ITU) Library & Archives Service from an original paper document in the ITU Library & Archives collections. La présente version électronique (PDF) a été numérisée par le Service de la bibliothèque et des archives de l'Union internationale des télécommunications (UIT) à partir d'un document papier original des collections de ce service. Esta versión electrónica (PDF) ha sido escaneada por el Servicio de Biblioteca y Archivos de la Unión Internacional de Telecomunicaciones (UIT) a partir de un documento impreso original de las colecciones del Servicio de Biblioteca y Archivos de la UIT. (ITU) ﻟﻼﺗﺼﺎﻻﺕ ﺍﻟﺪﻭﻟﻲ ﺍﻻﺗﺤﺎﺩ ﻓﻲ ﻭﺍﻟﻤﺤﻔﻮﻇﺎﺕ ﺍﻟﻤﻜﺘﺒﺔ ﻗﺴﻢ ﺃﺟﺮﺍﻩ ﺍﻟﻀﻮﺋﻲ ﺑﺎﻟﻤﺴﺢ ﺗﺼﻮﻳﺮ ﻧﺘﺎﺝ (PDF) ﺍﻹﻟﻜﺘﺮﻭﻧﻴﺔ ﺍﻟﻨﺴﺨﺔ ﻫﺬﻩ .ﻭﺍﻟﻤﺤﻔﻮﻇﺎﺕ ﺍﻟﻤﻜﺘﺒﺔ ﻗﺴﻢ ﻓﻲ ﺍﻟﻤﺘﻮﻓﺮﺓ ﺍﻟﻮﺛﺎﺋﻖ ﺿﻤﻦ ﺃﺻﻠﻴﺔ ﻭﺭﻗﻴﺔ ﻭﺛﻴﻘﺔ ﻣﻦ ﻧﻘﻼ ً◌ 此电子版（PDF版本）由国际电信联盟（ITU）图书馆和档案室利用存于该处的纸质文件扫描提供。 Настоящий электронный вариант (PDF) был подготовлен в библиотечно-архивной службе Международного союза электросвязи путем сканирования исходного документа в бумажной форме из библиотечно-архивной службы МСЭ. © International Telecommunication Union /'y •&r++-rS**r, court oonsm.TflW » n o m i d e s « ■ « » TE liPU O ’.lIQUES ii DBfiHDE C1STAI3CE. ' t INTERNATIONAL ADVISORY COMPVIITTEE ON LONG DISTANCE TELEPHONY IN EUROPE. C o n f e r e n c e (HELD IN PARIS June 22nd—29th, 1925). MINUTES OF PROCEEDINGS. ENGLISH VERSION. VINCENT CROOKS, DAY & SON, LTD., Llj ccm rrtf consulpatif international des communications T&J&H0NK8JES A GRANDE DISTANCE. INCERNAXIONAL ADVISORY COMMITTEE OH LONG DISTANCE TELEPHONY IN EUROPE. - CONFERENCE HELD IN PARIS JUNE 22nd*~29th, 1925. MINUTES OF PROCEEDINGS. ENGLISH VERSION. (The O fficial Text i3 in French) I. CEHEHAL INDEX. Page: Introduction ........... 1 List of Delegates (Appendix I) .............. 4 SECTION I - TRANSMISSION; Specification of International Telephone Cables, Apparatus and Methods of Measurement for Maintenance of Inter­ national Circuits ........... 6 Part I . ......................................................... B (I) Choice of Transmission Unit ............... ' 8 (II) Questions relating to the working of International Circuits ......................... 9 (ill) Measurement of the efficiency of Subscribers’ Apparatus, etc. ........... 14 Part II. System’s Specification ........................... 16 •Part III. Methods of Measurement and Apparatus for Maintenance of International Circuits ...... 18 Apparatus for Routine Tests ................................... 20 Extract from Minutes of Conference of Permanent Commis­ sion of C.C.I. held in Paris Motember/December 1924 (Appendix Z) ................ 31 Report submitted to Permanent Commission by Rapporteurs o f Germany and Great B r ita in on TU ................ 32 Appendix 5. Signalling with Currents, having an interrupted frequency of 1000 cycles per second ............ 40 Appendix 4. Essential clauses for a typical specification generally applying to factory lengths of international telephone cables of the quadded type . .................... 42 Appendix 5. Essential clauses for a typical specification of general application to loading coils for international telephone cables ........................ *..... 50 Appendix 6 . Essential clauses for a typical specification for repeater sections of loaded international telephone ca b les .............. ...................................... ............. ............... 53 Appendix 7. Essential clauses for a typical specification for the supply of 2-wire telephone repeaters .................... 63 Appendix 8 . Essential clauses for a typical specification for the supply of 4^wire telephone repeaters .................. 65 Appendix 9. A method for the measurement of the trans­ mission efficiency of telephone apparatus at a subscriber’s office - by A.J. Aldridge, A.C.G.I. and A. Hudson. 8 -Sc. 67 II. Page > Ann&idtx 10, Method of testing subscfibers* instruments from the central office ...................... 72 SECTION 2 - INTERFERENCE HUM POWER CIRCOITS: III. Protection of telephone lines from Interference . by hi^i power installations- ................... ................. 7 4 ^ Guiding principles to be observed in the adoption of measures designed for the protection of telephone lines from interference caused by high power Installations .... 75 I. Measures relating to telephone lines and / Installations ...................................................... 76 II. Measures relating to high tension installations and to traction installations ................... 77 III. Measures to be taken in cases where heavy current or high tension lines run parallel to overhead telephone lines ........... 60 Section A - Buies to be adopted In examining fresh schemes of power lines which w ill run parallel with telephone lines ........... 81 ■Section B - fiules relating to existing parallel isms .. 86 IV» Measures to be taken in case of proximities between power lines and telephone cables ....... 88 Appendix 11 (with supplement). Determination of the symmetry to earth of Trunk Telephone lin e s .......... 90 Supplement 10 Appendix' 11. Motes on testing"the symmetxy of telephone lines with respect to earth ............... 94 Appendix 1% (with Supplements 1 and 2). Examination of the conditions under which proximity may be permitted between high tension power lines - poly-phase or single­ phase alternating currents, symmetrical and not connected m etallically to earth at any point - and telephone lines 100 Sunniemeut 1 to Appendix IX. Determination of the Characteristic Coefficient of Exposure to Banger ................ 105 Supplement 2 to Appendix 12. Development of the formulae used for determining electric induction, etc. ............. 106 A d d ition al S h eets (Supplement 2 o f Appendix" 1 2 ) ..................... 121 Appendix IS. Examination of the conditions under which Proximity may be allowable between Telephone Lines and 3-phase or Single-phase High Tension Alternating current Linas which have an Earthed Neutral Point ........................... 125 Anneiidix 14. Examination of the conditions under which Proximity (Parallelism; between Alternating Current Sintfle-uhase Hallways and 3—phase Hallways with Bail- HetUrn, on the one hand, and Telephone Lines, on the other hand, may be perm itted ........................*.................................. 129 P age: . Appendix 15. Measurement of Interference Voltages induced in Telephdne Circuits 135 Appendix 16. Deterrsinati on of the Degree of Unbalance of Telephone Circuits with reference to Disturbing Lines ............ • ........................... 139 SECTION 5 - TARIFFS AND TRAFFIC: IV. Establishment of Variable Tariffs according to the time of day. Facilities to be- offered to the Public ......... 143 Telegraphic Preparation of Telephone Cells ..... 145 Statistics of Telephone Traffic ................ 146 Exploitation of International Circuits ................... 148 Calculat ion of Int ©mational Charges • • ............ 148 Minimum Traffic to be assured to -Transit Countrios 149 Periodic Meetings between Supervisors of Inter­ national Telephone' Exchanges ........... 152 /' International Code cf Telephone Regulations .... 152 Tables 1-A and 1 -8 ............. 154 Tablo 2 .................. 155 Tables 3 and 4 • 156 • Table 5 .................*...................... 157 International Advisory Communications on Long Distance Telephony in Europe. Conference held in Paris 22-29 June. 1925. INTRODUCTION. - The second conference o f the above ^Committee was h eld in P a ris from the 22nd to 29th June, 1925. A 11 at of the Delegates attending is attached hereto. (Appendix I). At the opening meeting, on the 22nd June, 1925, Id. Milon we 1 corned the Delegates and said that he was particularly proud, as Chief of the French Delegation, to be able to emphasise the perfect cordiality which had characterised previous conferences of the Coranittee. He desired particularly to extend a welcome to the represen­ tatives of the additional nations which had Joined the Committee, viz:- Lithuania and Esthonia, while regretting the absence of Rumania, which absence he hoped would merely be temporary. On the motion of the head of the British Delegation, M. Milon was re-elected president for the forthcoming year. M. M ilon,.for the benefit of the nations who were not repre­ sented on the "Permanent Commission" of the C.C.I , described the worlr which had been done by that Ccoanlssion, which had assembled in Paris from 24th November to 1st December, 1924. The reports furnished by the Permanent Ccaraaissiou on .the subjects indicated below .would form the principal basis of the deliberations of the Conference:- (1) D ra ftin g o f a s in g le and coherent programme of work to be done in the construction of international lines in the immediate and distant future. (2) Construction of a diagrammatic map of lines (overhead or underground), to be laid during the year 1925/26 in Europe. (3) Drafting of a typical specification for Interactional European Telephone Cables, together with their accessories (Loading - 2 - Coils and Repeaters). (4) Choice of methods and measuring apparatus necessary for the supervision and maintenance of telephone lines and plant. (5) Investigation of various methods of measuring the efficiency of subscribers* apparatus and of the transmission equivalent of the various pieces of apparatus employed in telephonic communication. ( 6 ) Choice of a Unit of Transmission# (7) Heasures to.be taken for protecting international telephone lines from
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