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ITC — The International Teletraffic Congresses CHRISTIAN JACOB.-EUS. TE L E FO N A K T I E B O L AG E T LM ERICSSON. STOCKHOLM 118 UDC 0613:621.395.31 LME 807 519 The Seventh International Teletraffic Congress (ITC 7) was held in Stockholm in June 1973. It was IS years since the first of these congresses was organized in Copenhagen. They have now become an established institution within the world of telephony and arc considered important and of significance both for administrations and industry. This paper describes the origin of the congresses and their development hitherto. The main aim of teletraffic research is to establish rules and methods for the dimensioning of telecommunication systems. During the manual period and the first decades of the automatic era it sufficed to use fairly simple rules of thumb. The nature of telephone traffic was then not sufficiently known and in many cases the mathematical tools which were later to prove necessary were also lacking. The first two decades of the century saw the birth of traffic research as a science through the work of the Dane A. K. Erlang. He introduced the classical concept of statistical equilibrium as a mathematical description of telephone traffic. Erlang's formulae laid the foundations for the future work within this science. Traffic research has attracted the interest both of engineers and mathematicians. It soon proved also that administrations and industry had a growing need for and interest in correct dimensioning methods. It was found that large sums could often be saved by this means, while at the same time a certainty was achieved that the traffic could be handled without troublesome bottlenecks. The origin of the teletraffic congresses In the late forties and early fifties it became clear to many of those working on traffic theory questions that closer contact between researchers in the field would be of great value. A meeting at which people could present their work, where ideas and experience could be exchanged, and, not least, where personal contacts could be made, was considered to be greatly desirable. In the autumn of 1953 an organizational committee was formed consisting of E. Brockmeyer, Denmark C. Jacobaus, Sweden A. Jensen, Denmark L. Kosten, Holland N. Rodenburg, Holland ERICSSON REVIEW No. 4, 1973
Table 1 Data of delegates and papers at the International Teletraffic Congresses The reference numbers refer to (he list of publications contained in the bibliography The committee considered that Denmark should be host nation for the first congress in view of the decisive contribution made within telephone traffic research by A. K. Eriang. Denmark also undertook with enthusiasm to organize the first teletraffic congress. It was held in Copenhagen on June 2(1—23, 1955, and was attended by 69 delegates from 13 countries. Twenty-six papers were presented and discussed. A report entitled The First International Congress on the Application of the Theory of Probability in Telephone Engineering and Administration was published in the Danish telecommunications journal TELETEKNIK, English edition. Vol. 1. No. 1, 1957. The report contains certain papers in their entirety and summaries of the contributions which had already been published in various journals. The delegates considered generally that the congress had been very successful and fruitful and it appeared self-evident that future congresses should be arranged. Teletraffic congresses have since been held every third year. The attendance at and contributions to various congresses are shown in table 1. At the first congress a council entitled the International Advisory Council (I AC) was set up. From the start I AC has been composed of researchers from the leading countries within the field. The chairman has throughout been Professor Dr A me Jensen, who has also played the greatest part in drawing up the lines for the congresses; more than any other he has set his mark upon them. The responsibility for the organization and arrangement of the various congresses has rested with the host countries. Through great generosity on the part of administrations and industry in the various host countries the congresses have always been very well organized. Highly appreciated programmes for the wives of delegates have been a common feature. All events, as also the congresses themselves, have been free of charge to the delegates. Programmes of the congresses The programme of the first congress was defined in the very title: Application of the Theory of Probability in Telephone Engineering and Administration. In the papers presented at it there was a strong emphasis on different sections of traffic research such as gradings, link systems, queueing theory and traffic measurements. These fields have, of course, been the main subject of discussion at all congresses, but new types of problems created by the accelerating development within telecommunications and different questions solved chiefly by opera- ERICSSON REVIEW No. 4, 1973 119
Page 1: 4 1973
Page 6 and 7: 120 tions research methods have acq
Page 8 and 9: Seventh International Teletraffic C
Page 10 and 11: 124 At the opening session addresse
Page 12 and 13: 126 tions of state, and equivalence
Page 14 and 15: 128 Queueing Theory with Applicatio
Page 16 and 17: 130 Naturally some critical comment
Page 18 and 19: 132 of introducing new classes of s
Page 20 and 21: Fig. 2 ARE exchange, (milking diagr
Page 22 and 23: Fig. 4 Processor APN 110 CPU Centra
Page 24 and 25: Fig. 6 Bus connection of processor
Page 26 and 27: 140 in and additions to the control
Page 28 and 29: 142 case REP sends an order to SCS
Page 30 and 31: Fig. 9 (left) Trunking diagram for
Page 32 and 33: Manual Switchboard and Supervisory
Page 34 and 35: Fig. 4 Switchboard with sloping key
Page 36 and 37: Technicians within the Ericsson Gro
Page 38 and 39: Electrical voting system for Finnis
Page 40: TELEFONAKTIEBOLAGET LM ERICSSON PAN

the ericsson group - History of Ericsson - History of Ericsson

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