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C.C.I.F. Plenary Session: Documents (Paris, 1926)

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C.C.I.F. Plenary Session: Documents (Paris, 1926) 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 COMITE CONSULTATIF INTERNATIONAL DES COMMUNICATIONS TELEPHONIQUES A GRANDE DISTANCE. Plenary Session, Como, 5th-i2th September, 1927. English Edition, Issued by The International Standard Electric Corporation. London. 1928. PREFACE TO THE ENGLISH EDITION. This volume contains an unofficial translation of the official French text of the proceedings of the COMITE CONSULTATIF INTERNATIONAL DES COMMUNICATIONS TELEPHONIQUES A GRANDE D i s t a n c e (C.C.I.) at its Plenary Session in Como, 5th-i2th September, 1927—with the exception of Section V I; Questions concerning the protection of telephone cables against corrosion due to electrolysis or to chemical action—which has been printed as a separate volume. I nternational S t a n d a r d E l e c t r i c C o r p o r a t i o n . 2 COMITE. CONSULTATIF INTERNATIONAL DES COMMUNICATIONS TELEPHONIQUES A GRANDE DISTANCE. Plenary Session, Como, 5th-i2th September, 1927. Page I. List of Delegates and Experts . .. .. .... 7 II. Minutes of the Opening Meeting . .. .. .. .... 11 III. Questions of general organisation . .. 16 IV . Questions concerning transmission, maintenance and supervision of lines and installations .. 18 V, Questions concerning • traffic and operating 78 VI. Questions concerning the protection of telephone cables against corrosion due to electrolysis or to chemical action*. VII. Minutes of the Closing Meeting .. .. .. .. .. .... '.. .. ... 90 VIII. Recapitulation of the questions raised by the C.C.I. since its inception.. .. .. .. 99 * Printed as a separate volume.' 3 GENERAL SUBJECT INDEX. ■ ... • . ... .............. ■ Page I.—List of Delegates ...... .. .. .. .... .. .. .. 7 II.—Minutes of the Opening Meeting ..................................................................................... .. 11 III.—Questions of General Organisation : Distribution of Expenses incurred in the Operations of the Permanent Secretariat . 16 Vocabulary of expressions used in Telephony . 16 Permanent Staff Regulations for the Secretariat of the International Consultative Committee for Long Distance Communication . .. .. 17 IV.—Questions concerning Transmission, Maintenance and Supervision of Lines and Installations : (A.a.2.) Practical Limits of Transmission Equivalents .. .. .. .. .. 18 General Conditions to be fulfilled by Open-wire Lines used for International Communications : (A.d.l.) Setting up of Open-wire Lines .. ,, ., ,. .. .. ,. .. 19 (A.d.3.) General conditions to be fulfilled by sections of cable inserted in Open-wire Lines so far as loss of efficiency and impedance irregularities are concerned . 20 Rules for the Construction and Loading of Cables inserted in Open-wire Lines.. .. 21 APPENDIX 2.—Notes by Messrs. Siemens and Halske (Central Laboratories) on the insertion - of a section of Cable in an Open-wire L i n e .............................. ..24 APPENDIX 3 —Notes by the International Standard Electric Corporation regarding Inter­ mediate Sections of Cable inserted in Open-wire Lines /. 33 Nomenclature of International' Circuits I. Nomenclature of the Circuits . .. .... .. ... 49 II. Schematic Plan of the Cables .... .... 51 (A.e.) Instructions for Putting into Service and M aintaining International Telephone Circuits : ■ • A.—Setting up and Putting into Service of International Circuits • . • . ,, • . 52 B.—Routine Tests to be made in order to ensure satisfactory Operation of the Circuits . 53 . 1. Daily Tests .. ..' .. .. .. • • • • 53 2.Weekly Tests . .. ... 53 3. Monthly Tests . .. .... • • 53 - 4. Q uarterly. T ests - .. • • .. ■ . ■ • • - - . • • • • • • • • • 54 5. Half-Yearly Tests . ., . 54 - 6. Y early T ests - . ■ . •. 54 7. Sundry T ests . • • 54 8. Circulation of Information . ... 54 9. Localisation of Faults . .V ; . 55 APPENDIX 1.—Cable Circuits “ Germany—Belgium ” .. .... .... .. 56 APPENDIX 2.— Special instruction for the Maintenance of Telephone Circuits.............................. 59 APPENDIX 3.— Cross-talk Tests ........................................................................ 60 APPENDIX 4 —Quarterly Report of Repeater S t a t i o n .......................................................61 (A.a.l.) Definition of some Expressions used in Questions of Telephone Transmissions : (a) General Definition . .. .. .. 62 (A.a.l.) Conditions which the Transmission Reference Systems should fulfil . 62 I.—Transmitting System .. .. ; •. • • • . 63 Definition of the Acoustic Input to the Transmitter .. .. .. ..63 Method of measuring the Acoustic Input to the Transmitter . 63 Maximum permissible Acoustic Power for which the Transmitter is to be constructed 63 The Value of the Output Impedance of the Transmitting System .. 63 Adjustment of the efficiency of the Transmitting System . .. .. 63 Ratio between the Acoustic and Electric Power (taken respectively at the Input and Output of the Transmitting System) defining the Zero Point of the Transmitting System .. 63 4 I.—-Transmitting System— cont. Page “'Frequency “Range in which -this Ratio must remain Constant. Tolerable Variations of this Ratio within this Frequency Range . 63 “ 'Maximum permissible Non-linear' Distortion (a) for *the M axim um Pow er, (b) for = a given Fraction of this Power . 6 4 • ‘Method of construction of Transmitting System satisfying the required conditions 64 II.—Reference Artificial Line 65 Characteristic Impedance of' the Reference Artificial Line 65 Adjustment of’the attenuation of the Reference Artificial Line - . 65 III.—Reference Receiving System .. .. .. .... ' .. .. 65 Definition of the Acoustic O utput. of the, Receiyer 65 Method of measuring, the Acoustic. Output of the Receiver 65 The value of the Electric Impedance at the Input of the Receiving System 65 Adjustment of the efficiency of the Receiving System 65 Ratio between ,the Electrical and Acoustic Powers (taken respectively at the Input . and Output of the. Receiving System) defining the Zero Point of the Receiving System .. .. .. .. 65 Frequency range over which this Ratio must remain Constant. Tolerable variations of the Ratio in this Frequency Range 65 Maximum Nondinear Distortion permissible in the .Receiving System (a) for Maximum Power, (6) for a given Fraction of this Power . .. 66 Method of construction of Receiving System satisfying the required Conditions . 66 Comparison of Primary Reference Systems with Master Reference System and the Intervals of .Time at which such-Comparison should be made 66 Comparison of Secondary Systems with Primary Systems and with the Master System and the Intervals of Time at which this Comparison must be repeated 66 Realisation of Working Standards corresponding to the different Types of Commercial Telephone Connections existing in different Countries. Calibration of these Working Standards by relation to the Master, Primary and Secondary Systems, and the Intervals of Time at which these Calibrations must be repeated 67 Volume Level of Sound and Temperature 68 Definition and Determination of the “ Experimental Practice Coefficient ” of different Crews of Operators carrying out Voice and Ear Tests and working in the Phonometric Laboratories of the different Administrations . .. .. 68 Tests (Physical and Physiological) to be carried out in engaging Operators for the Phonometric Laboratories in order to ensure that their Hearing and Voices are in good Condition . .... .. .. 68 Definition and Determination of the mean correcting Factors corresponding to the different Languages o in order to oallow^ comparisons of Results of Measurements on Articulation carried out in different Countries, taking account of the Language ' employed ” . 68 Corrections to be applied to the Results of Measurements of Transmission Equivalents or Efficiency of Transmission to take account of the difference in impedance between the pieces of Apparatus measured and the Elements corresponding to the Reference System 68 (A.f.) Co-existence of Telephone and Telegraph Circuits in the same Cable 69 I.—Simultaneous Telegraphy and Telephony (over the same Conductors) or Infra-Acoustic T elegraphy 69 II.—Co-existent Telegraphy and Telephony (over separate Conductors) 70 III.-—Voice Frequency Telegraphy . .... 70 Selection of Carrier Frequencies 70 APPENDIX.—Proposal for the Selection of Carrier Telegraphy Frequencies to be used in Loaded Telephone Cables ..................................... .......................... 71 List of Transmission Questions under examination 75
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