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1. Comparison of a SETAC with the SFERT

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1. Comparison of a SETAC with the SFERT A NOTE FROM THE ITU LIBRARY & ARCHIVES SERVICE An erratum for this volume was issued for the French version of this publication. For reference purposes, it has been included with this PDF. 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. ﻫﺬﻩ ﺍﻟﻨﺴﺨﺔ ﺍﻹﻟﻜﺘﺮﻭﻧﻴﺔ (PDF) ﻧﺘﺎﺝ ﺗﺼﻮﻳﺮ ﺑﺎﻟﻤﺴﺢ ﺍﻟﻀﻮﺋﻲ ﺃﺟﺮﺍﻩ ﻗﺴﻢ ﺍﻟﻤﻜﺘﺒﺔ ﻭﺍﻟﻤﺤﻔﻮﻇﺎﺕ ﻓﻲ ﺍﻻﺗﺤﺎﺩ ﺍﻟﺪﻭﻟﻲ ﻟﻼﺗﺼﺎﻻﺕ (ITU) ﻧﻘﻼ ﻣﻦ ﻭﺛﻴﻘﺔ ﻭﺭﻗﻴﺔ ﺃﺻﻠﻴﺔ ﺿﻤﻦ ﺍﻟﻮﺛﺎﺋﻖ ﺍﻟﻤﺘﻮﻓﺮﺓ ﻓﻲ ﻗﺴﻢ ﺍﻟﻤﻜﺘﺒﺔ ﻭﺍﻟﻤﺤﻔﻮﻇﺎﺕ. ً 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 TELEPHONIQUE (C.C.I.F.) Xth PLENARY MEETING Budapest, 3rd— 10th September, 1934 VOLUME IV Transmission: Standards ; Methods and Apparatus for Measurements; Maintenance. English Edition. Issued by the International Standard Electric Corporation, London, 193b ERRATA DU TOME IV du Compte rendu de la Xu Assemblée plénière du C. C. I. F. Page 3, 5e ligne après le titre, lire téléphonique. Page 5, 7e ligne, lire: 11° Mesures des degrés de dyssymétrie et mesures des désé­ quilibres de capacité. Page 16,11e ligne et page 19, 3e, 6e et 9e lignes, au lieu de distorsion non linéaire, lire distorsion de non-linéarité. Page 74, insérer après la 12e ligne: 11° Les mesures des degrés de dyssymétrie, et les mesures des déséquilibres de capacité. 12° Les mesures effectuées sur les circuits exploités au moyen de courants porteurs de haute fréquence. Page 82, 2e formule, remplacer log. par loge. Page 109, 11e ligne, lire mégohm. Page 140, l re ligne, lire: 11° Mesures des degrés de dyssymétrie et mesures des désé­ quilibres de capacité. Page 140, 3e ligne, lire dyssymétrie. Page 215, 9e ligne en remontant, lire: B1 et B2 (comme à la 5e ligne en descendant), au lieu de B ( et B2. Page 220, (Note Bl), remplacer le tableau existant par le suivant: B D 0,05 0,238 0,1 0,455 0,15 0,621 0,2 0,734 0,25 0,811 0,3 0,860 0,4 0,918 0,5 0,950 0,6 0,968 0,7 0,981 0,8 0,991 0,9 0,994 Page 220, 10e ligne en descendant, remplacer 0,64 par 0,54. Page 221, Remplacer la figure 79 actuelle par la figure ci-après: — 132 — B ou Bi Fig. 79. — Logatomes du CCIF tirés de l'esperanto. Page 280, 4e ligne en descendant, lire « A à L ». Page 313, 4e et 5e lignes en remontant, lire « Liste des phrases usuelles à employer dans les services de dérangements et de mesures et dans les stations de répé­ teurs pour la maintenance » Page 322, remplacer la note en bas de page par la suivante: 1. On entend par « valeur correcte » la valeur nominale avec les tolérances admises pour les niveaux relatifs de puissance aux stations frontières, c’est-à-dire : de 600 p : s à 1.200 p : s, tolérance de ± 0,2 néper ou ± 1,7 décibel; de 400 p : s à 600 p : s et de 1.200 p : s à 1.600 p : s, tolérance de ± 0,3 néper ou ± 2,6 décibels; de 300 p : s à 400 p : s et de 1.600 p : s à 2.400 p : s, tolérance de ± 0,5 néper ou ± 4,3 décibels; de 2.400 p : s à 2.600 p : s (limite supérieure de la bande des fréquences à transmettre effectivement), tolérance de ± 0,6 néper ou ± 5,2 décibels (sous réserve qu’en aucun cas le niveau relatif de puissance ne dépasse pas ± 1 ,1 néper ou ± 0,6 décibels). Page 334, 17e ligne, au lieu de sous-dircetrice lire sous-directrice. VOLUME IV. TABLE OF CONTENTS English French Page Page PART 1.—STANDARDS OF TRANSMISSION. Vol. IV Telephone Transmission Reference Systems ... ... ... ... ... ... 344 11 Object of Telephone Transmission Reference Systems ... ... ... ... 344 11 The setting up of Telephone Transmission Reference Systems ... ... ... 344 12 Conditions which should be fulfilled by the Telephone Transmission Reference Systems ... ... ... ... ... ... ... ... ... ... 344 12 I. The Master Telephone Transmission Reference System (SFERT) ... 344 12 II. Telephone Transmission Reference Systems ... ................. ... ... 345 12 III. Working Standards ... ... ... ... ... ... ... ... ... 349 19 Recommendations regarding the calibration of reference systems and working standards ... ... ... ... ... ... ... ... ... ... 35° 20 (A) Normal adjustment of the Master Telephone Transmission Reference System (SFERT) :............................. 350 20 (B) The normal calling intensity to be used in phonometric tests... ........... 354 29 (C) Comparison of reference systems with the master reference system, and the periods at which such comparisons should be made... ... ... 354 30 (D) Initial comparison of working standards with the " SFERT ” or with a reference system ... ... ... ... ................. ... ... 354 31 1. Comparison of a SETAC with the SFERT ... ... ... ... 355 31 2. Comparison of a SETEM with the SFERT ... ... ... ... 358 38 (E) Periodic calibration of standard instruments by the SFERT laboratory... 361 43 Appendix I. Description of a Working Standard using a Carbon Microphone (SETAC) ... '.................................................................................................................. 363 46 Addendum to Appendix I. Essential clauses of a specification for the supply of repeating coils (toroidal coils) ................. ••• 365 49 Appendix II. Description of a working standard using an electro-magnetic microphone (SETEM) ... ... ... ... ... ... ... ... 366 52 PART 2. TESTING METHODS. Section I. Tests with Alternating Current............................................................................... 370 57 A. Tests on any quadripole ............................. 370 57 1. Tests of effective attenuation or gain ... ... ... ... ... ... 370 57 (a) First testing method ...................... ... ... ... 370 57 (b) Second testing method (Method Z -R ) ................... ... ................. ... 371 59 (c) Variation of the first testing method by using an automatic level recorder... 371 59 2. Measurement of insertion loss or gain ... ... ... ... ... ... 373 63 Application to the components of a telephone exchange ................. ... 374 63 3. Measurement of Line Transformers ... ... ... ... ... ... 377 70 (a) Measurement of effective attenuation at voice frequencies ... ... ... 377 70 (b) Measurement of the energy efficiency of line transformers used for low fre­ quency signalling, 16 to 25 p: s ... ... ... 378 71 B. Measurements made on telephone circuits ... ................. ... 379 73 1. Measurement of the overall attenuation ... ... ... ... ... 380 74 2. Measurement of absolute level, of level differences and of relative levels... 381 76 3. Measurement of repeater gain ... ... ... ... ... 382 79 4. Measurement of impedance ... ... ... ... ... 384 81 5. Measurement of balance attenuation, regularity attenuation, non-reflection attenuation and echo-current attenuation ............................................. 384 81 (a) Measurement of balance attenuation ... ... ... ... ... ... 384 81 (b) Measurement of regularity attenuation ... ... ... ... ... 387 87 (c) Measurement of non-reflection attenuation ... ... ... ... ... 387 87 (d) Measurement of echo-current attenuation ... ... ... ... ... 388 87 6. Determination of singing point and the measurement of stability or the sing­ ing margin ... ... ... ... ... ... ... ... ... 388 87 338 English French Page Page Vol. IV («) Determination of singing point ... 388 87 (b) Measurement of the stability of a telephone circuit ... 39o 91 {o) Measurement of the singing margin of a telephone circuit ... 39i 92 (d) The use of the automatic level recorder for determining singing point or the stability ... ... ................. ................. 39i 93 Verification of the battery voltages and the current of the repeater battery supply; Tests of Repeater Vacuum Tubes 396 IOI Measurement of distortion 396 IOI (a) Measurement of the frequency distortion of a telephone circuit from the curve of the overall attenuation plotted as a function of frequency... 396 IOI (b) Measurement of the index of phase distortion of a telephone circuit... 396 102 (c) Measurement of the non-linear distortion of a telephone circuit ... 403 114 (C.I) Measurement of harmonic distortion ... 403 I I 4 (c.2) Measurement of variation of attenuation as a function of the amplitude (for a telephone circuit) ... 404 115 Measurement of crosstalk ... ... ... ................. 404 I l 6 (a) Measurement of near-end crosstalk 404 I l 6 (b) Measurement of far-end crosstalk 407 120 Measurement of crosstalk between channels of a carrier system ... 4°9 123 Electrical source for use in crosstalk measurements 4°9 124 (A) Oscillator producing a sinusoidal current 410 125 (B) Oscillator producing a complex current ... ... ...' ... ... 411 127 ' Receiver arrangement for use in the measurement of crosstalk 412 130 Curve of the crosstalk attenuation plotted as a function of frequency ... 4*4 132 Table showing how requirements are met by forms of crosstalk guarantee 415 134 Measurements of circuit noise
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