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CCIF (Geneva, 1954) 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 INTERNATIONAL TELEPHONE CONSULTATIVE COMMITTEE (C. C. I. F.) XVIIth PLENARY ASSEMBLY GENEVA, 4-12 OCTOBER, 1954 VOLUME III LINE TRANSMISSION MAINTENANCE Published by the International Telecommunication Union Geneva, 1956 INTERNATIONAL TELEPHONE CONSULTATIVE COMMITTEE (C. C. I. F.) XVIIth PLENARY ASSEMBLY GENEVA, 4-12 OCTOBER, 1954 VOLUME III LINE TRANSMISSION MAINTENANCE PAGE INTENTIONALLY LEFT BLANK PAGE LAISSEE EN BLANC INTENTIONNELLEMENT TABLE OF CONTENTS OF VOLUME III OF THE GREEN BOOK OF THE C.C.I.F. Line Transmission Maintenance Page Tables summarising the characteristics of circuits: Telephony (and telegraphy)................................................................................................... 16 Programme transm issions.......................................................................................... 18 T elevision.......................................... , ..................................................... 19 Part 1 — Telephony Section 1 General characteristics of international telephone connection within a continent and of intercontinental connections 1.1. General characteristics of the complete international telephone connection or of the . continental section of an international intercontinental telephone connection . 21 1.1.1. Reference equivalents............................ 21 1.1.2. Indices of transmission q u a lit y ................................................................... 23 1.1.3. Impairments of transmission q u a li t y ........................................................... 27 1.1.4. Group propagation time . ........................ 28 1.1.5. Phase distortion . ............................................ 29 1.1. General characteristics of the chain consisting of the international telephone circuit and the national trunk extension circuits.............................................................................. 30 1.2.1. Admissible equivalent in service of a trunk circuit as regards stability and echo 30 1.2.2. Echo effects ................................ 30 1.2.3. Transmission stability..................................................................... 34 1.2.4. Linear c r o s s ta lk ............................................................................................. 35 1.2.5. Circuit n o ise ........................................................................................................ 36 1.2.6. Interconnection of international and national c ir c u its.............................. 37 1.2.7. Impedance of international and trunk circuits ............................................. 38 1.2.8. Characteristics of loaded cable trunk circuits liable to carry international conversations................................................................. 38 1.3. General characteristics of an international circuit within one continent................. 38 1.3.1. General ................................ 38 1.3.2. Nominal equivalent............................................................................................ 39 1.3.3. Frequency band effectively transmitted and attenuation distortion.......... 40 1.3.4. Variation, as a function of time, of the equivalent of a complete circuit . 41 1.3.5. Group propagation time.................................................... 41 1.3.6. Phase d isto r tio n ........................................ 41 4 TABLE OF CONTENTS Page 1.3.7. Linear c r o s s ta lk ....................................................................................................... 42 1.3.8. Circuit noise including non-linear c r o s s ta lk ..................................................... 42 Section 2 General characteristics of intercontinental circuits 2.1. General characteristics of a very long intercontinental circuit on open wire lines . 43 2.2. General characteristics of a very long intercontinental circuit with possibly one or more short submarine se c tio n s............................................................................................... 43 2.3. Provisional general characteristics of an intercontinental circuit comprising a long deep sea submarine section ................................................................................................... 44 Section 3 Detailed characteristics of international carrier telephone systems on metallic lines 3.1. Characteristics common to all modern carrier systems providing 12 long-distance telephony circuits . ............................................. 45 3.1.1. General recommendations................................................................. 45 Note. — Definition of psophometric power and general definition of “ nominal maximum circuits ” .................................................................................. 47 3.1.2. Terminal equipm ents....................... 50 . 3.1.3. Transfer of a group or supergroup .................................................... 52 3.1.4. Group and supergroup pilots .............................................................................. 54 Note. — Definitions concerning international carrier sy ste m s......................... 57 3.2. Systems providing 12 carrier telephone circuits on an open wire p a i r ........................ 59 3.2.1. General characteristics.......................................................................................... 59 3.2.2. Terminal equipm ents.......................................................................................... 65 3.2.3. Intermediate repeaters..................................................................... 66 3.2.4. L in e s .......................................................................................................... 67 3.3. Carrier telephone systems on non-loaded symmetrical pair cables providing 1, 2, 3, 4 or 5 g r o u p s ................................................. 68 3.3.1. G eneral....................................................................................................................... 68 3.3.2. Systems providing 1, 2 or 3 g r o u p s..................................................................... 73 3.3.3. Systems providing 4 groups . ' .............................................................................. 75 3.3.4. Systems providing 5 g r o u p s .................................................................................. 75 3.3.5. Intermediate and terminal repeaters..................................................................... 77 3.3.6. L in e s ................... 79 A. Cable specification........................ 79 B. Specification of a repeater section.................................................................. 82 3.4. Carrier telephony systems on coaxial c a b le s ..................................................... 85 3.4.1. General characteristics.......................................................................................... 85 3.4.2. Terminal E q u ip m en t.............................................................................................. 95 3.4.5. R ep eaters................................................................................................................... 95 3.4.4. L in e s ........................................................................................................................... 96 A. Cable specification..................................................... 96 B. Specification of a repeater section ............................................................ 98 TABLE OF CONTENTS 5 Page 3.4.5. Constitution, supervision and supply of power to a coaxial system .... 98 3.4.6. Interconnexion of coaxial systems of different ty p e s............................ 102 3.5. Other modern carrier s y s te m s .................................................................................. 104 3.5.1. Systems providing 3 carrier telephone channels on open wire lines .... 104 3.5.2. 12 + 12 systems in c a b l e • . 107 Section 4 General characteristics of carrier telephone systems on radio relay systems 4.1. Use of radio relay systems to carry international telephone circuits................. 110 4.2. Terminal equipments of radio relay systems forming part of a telecommunication netw ork........................................................................................................................... 110 4.3. Radio relay systems employing pulse m odulation........................................
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