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Volume Iv.2 of the C.C.I.T.T

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Volume Iv.2 of the C.C.I.T.T 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 THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE (C.C.I.T.T.) FIFTH PLENARY ASSEMBLY GENEVA, 4-15 DECEMBER 1972 GREEN BOOK © VOLUME IV. 2 Maintenance Supplements to Series M, N and O Recommendations Published by THE INTERNATIONAL TELECOMMUNICATION UNION 1973 THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE (C.C.I.T.T.) FIFTH PLENARY ASSEMBLY GENEVA, 4-15 DECEMBER 1972 GREEN BOOK o VOLUME IV. 2 Maintenance Supplements to Series M, N and O Recommendations Published by THE INTERNATIONAL TELECOMMUNICATION UNION 1973 CONTENTS OF THE C.C.I.T.T. BOOKS APPLICABLE AFTER THE FIFTH PLENARY ASSEMBLY (1972) GREEN BOOK Volume I — Minutes and reports of the Vth Plenary Assembly of the C.C.I.T.T. — Resolutions and Opinions issued by the C.C.I.T.T. — General table of Study Groups and Working Parties for the period 1973-1976. — Summary table of Questions under Study in the period 1973-1976. — Recommendations (Series A) on the organization of the work of the C.C.I.T.T. — Recommendations (Series B) relating to means of expression. — Recommendations (Series C) relating to general telecommunication statistics. Volume II-A — Recommendations (Series D) and Questions (Study Group III) relating to the lease of circuits. — Recommendations (Series E) and Questions (Study Group II) relating to telephone operation and tariffs. Volume 1I-B — Recommendations (Series F) and Questions (Study Group I) relating to telegraph operation and tariffs. Volume III — Recommendations (Series G, H and J) and Questions (Study Groups XV, XVI, Special Study Groups C and D) relating to line transmission. Volume IV — Recommendations (Series M, N and O) and Questions (Study Group IV) relating to the mainte­ nance of international lines, circuits and chains of circuits. Volume V — Recommendations (Series P) and Questions (Study Group XII) relating to telephone transmission quality, local networks and telephone sets equipment. Volume VI — Recommendations (Series Q) and Questions (Study Groups XI and XIII) relating to telephone signalling and switching. Volume VII — Recommendations (Series R, S, T and U) and Questions (Study Groups VIII, IX, X and XIV) relating to telegraph technique. Volume VIII — Recommendations (Series V and X) and Questions (Study Group VII and Special Study Group A) relating to data transmission. Volume IX — Recommendations (Series K) and Questions (Study Group V) relating to protection against interference. — Recommendations (Series L) and Questions (Study Group VI) relating to the protection of cable sheaths and poles. Each volume also contains, where appropriate: — Definitions of specific terms used in the field of this volume. — Supplements for information and documentary purposes. CONTENTS OF VOLUME IV.2 OF THE C.C.I.T.T. GREEN BOOK MAINTENANCE PART V — Supplements to Series M, N and O Recommendations Page 1. Technical information Supplement N o. 1.1 — Prefixes used in the decimal system ........................................................................................409 Supplement N o. 1.2 — Transmission measurement conversion tables ......................................................................409 Supplement N o. 1.3 — The normal (or Laplace-Gauss) distribution ......................................................................416 Supplement N o. 1.4 — Methods of quality control ..................................................................................................... 422 Supplement No. 1.5 — Mathematical processing of the measurement results of the variations of the overall loss of telephone circu its ........................................................................................... 451 Supplement No. 1.6 — Statistical theory requirements................................................................................................459 2. Measuring techniques Supplement N o. 2.1 — Some general observations concerning measuring instruments and measuring tec h n iq u e s........................................................................................................................................ 463 Supplement N o. 2.2 — Measurements of lo s s ...................................................................................................................471 Supplement N o. 2.3 — Level measurements.......................................................................................................................475 Supplement N o. 2.4 — Measurement of crosstalk ..........................................................................................................480 Supplement No. 2.5 — Measuring errors and differences due to impedance inaccuracies of instruments and apparatus. Use of decoupled measuring p o in ts ....................................................... 482 Supplement N o. 2.6 — Errors in the indications given by level-measuring instruments due to interfering signals .............................................................................................................................................489 Supplement N o. 2.7 — Measurement of group delay and group delay distortion ...........................................492 Supplement N o. 2.8 — Measurements of sudden phase changes on circuits .........................................................508 Supplement N o. 2.9 — Vibration t e s t in g ................................................................................................... 511 Supplement N o. 2.10 — Method for measuring the frequency shift introduced by a carrier channel. 522 Supplement N o. 2.11 — Rapid verification test for echo control................................................................................... 524 Supplement N o. 2.12 — An automatic data acquisition and effective processing procedure for group and supergroup pilot levels ............................................................................................................. 524 3. Measuring equipment specifications Supplement N o. 3.1 — Measuring instrument requirements. Sinusoidal signal generators and level- measuring instruments ............................................................................................................. 530 VOLUME IV.2 — Contents CONTENTS Page Supplement No. 3.2 — Noise-measuring instruments for telecommunication circuits .....................................534 Supplement No. 3.3 — Principal characteristics of volume indicators .....................................................................548 4. Transmission performance of the international network Supplement N o. 4.1 — Results of measurements and observations on the stability of the overall loss of circuits in the international n e tw o rk ............................................................................. 550 Supplement N o. 4.2 — Results and analysis of the 9th series of tests of short breaks in transmission . 556 Supplement No. 4.3 — Characteristics of leased international telephone-type circuits .....................................564 Supplement N o. 4.5 — Instructions for making future measurements of the transmission quality of complete connections and for recording the results of the measurements . 569 Supplement No. 4.6 — Instructions for making future measurements of the transmission quality of national extensions (excluding subscribers’ local lines) and for recording the results of the m easurem ents ....................................................................................................580 Supplement No. 4.7 — Instructions for making future measurements of the transmission quality of international circuits, chains of circuits and international centres and for re­ cording the results of the m easurem ents ............................................................................. 587 Supplement N o. 4.8 — Results and analysis of tests of impulsive n o ise ................................................................593 5. Maintenance of television circuits Supplement N o. 5.1 — Requirements for the transmission of television signals over long distances . 598 Supplement N o. 5.2 — Test sequence used by members of the E.B.U. during the line-up period . 619 6. Miscellaneous Supplement N o. 6.1 — Effect on maintenance of the introduction of new components and of modern equipment design ......................................................................................................................620
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