1959 - History of Ericsson - History of Ericsson

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L M Ericsson to Undertake First C.T.C. Installation in Portugal Companhia dos Camhinos de Ferro Portugueses (C.P.), the Portuguese Railway Company, has decided to introduce C.T.C. on the single-track line Sctil-Vendas Novas (see map), which is important especially for goods traffic. This will be the first C.T.C. installation in Portugal. L M Ericsson is to supply and install the equipment under a contract worth some 3 million kroner. The Setil-Vendas Novas line is 44 miles in length and has 1 1 stations. Each station has two tracks. The C.T.C. system will be of special type insofar as the points will not be under remote control. They will normally be positioned for left-track movement at the stations, but facilities will exist for local point operation, for example for shunting purposes. Despite this simplification it is anticipated that the introduction of C.T.C. 134 will substantially increase the capacity of the line and lead to a saving in manpower. Only two stations receive their current supplies from the mains. The signalling equipment at all other stations will be operated from primary cells. This necessitates a very low current consumption; all signals will therefore normally be extinguished. They light automatically on the arrival of a train on the approach track circuit. The C.T.C. office will be situated at Setil, and controls will be transmitted with a keyset. The entire plant will comprise about 90 signals and 90 track circuits. All equipment is to be delivered during 1960. and the installation is to be officially opened on February 1, 1961. Modern P.A.B.X. for Oslo Newspaper The Norwegian "Aftenposten" started to use its new telephone switchboard at the end of September. It is a crossbar type P.A.B.X. supplied by L M Ericsson, Stockholm, in cooperation with A/S Elektrisk Bureau, Oslo. (Above) Mr. Reidar Hansen from Norwegian Telecommunications Administration, Oslo district, inspecting a crossbar switch in the new P.A.B.X. The plant, comprising 300 extensions within the Aftenposten offices, has greatly improved the newspaper's communications. The new switchboard makes it easier for the public to contact any member of the editorial staff. The latest news can be heard from an automatic telephone answerer. Through the automatic call-back service an extension user who meets the engaged condition when ringing another extension is connected as soon as the number becomes free. A recent exhibition in Rome "VI. Rassegna Internationale Elettronica Nucleare e della Cinematografia" was honoured by the visit of President Giovanni Gronchi. He is here seen with Sr. Luigi Baggiani, managing director of LM Ericsson's Italian subsidiary, F.A.T.M.E., admiring a model of the Ericofon.
UDC 621.395.24 CLEMENTZ, B & MELIN, C: Private Automatic Exchange for 15 Lines. Ericsson Rev. 56(1959): 4, pp. 127—130 In order to be able to offer a complete series of P.A.X. units from 10 extensions and upwards, L M Ericsson has designed a relay switchboard AMD 20101. It has a capacity of 15 lines with two link circuits and may be said to replace the popular OL 3511/1 which has now gone out of production. UDC 621.395.721.4 621.395.623.7 MITNITZKY, I & AHLSTROM, P: Ericovox, the One-Piece Loudspeaking Telephone. Ericsson Rev. 56(1959): 4, pp. 100—108. Telefonaktiebolaget LM Ericsson's first loudspeaking telephone for operation on public exchange lines was introduced in 1945. The development of semiconductors, in this case represented by transistors and diodes, has opened the way to an entirely new design of loudspeaking telephone, the Ericovox, consisting of a single unit. It can be installed wherever an ordinary telephone is used, being practically independent of room acoustics and length of line. With this telephone conversations can be conducted with both hands free. UDC 745/749:621.395.623.7 OLSSON, T: An Idea Takes Shape. How L M Ericsson's New Loudspeaking Telephone Came to Birth. Ericsson Rev. 56(1959): 4, pp. 109—117. The article contains an account of some of the principal steps in the work of designing and giving shape to L M Ericsson's new loudspeaking telephone. The account has inevitably had to be abridged and the chronological sequence to some extent rearranged. In actual fact the designers were so pressed for time that on several occasions they had to work on different lines of development simultaneously. UDC 621.395.722 621.395.34 REHNBERG, E: Gothenburg Automatic Transit Exchange ART 205. Ericsson Rev. 36 (1959): 4, pp. 118 — 126. The Gothenburg transit exchange was ordered from L M Ericsson on March 26, 1956, for cut-over on April 1, 1959. The exchange was designed on the Administration's crossbar system for transit exchanges A-205. Modifications were introduced to adapt it to existing telephone exchanges in Gothenburg.
Page 1: 4 1959
Page 4 and 5: Ericovox, the One-Piece Loudspeakin
Page 6 and 7: Fig. 3 X 8156 Block schematic of co
Page 8 and 9: Fig. 5 x 8163 The Ericovox, L M Eri
Page 10 and 11: Fig. 8 X 2443 Sending frequency res
Page 12 and 13: 108 The Ericovox meets the requirem
Page 14 and 15: Fig. 3 Grouping of components in wi
Page 16 and 17: Fig. 9 X 8132 Case with pyramid-sha
Page 18 and 19: Fig. 12 X8134 Instrument with base
Page 20 and 21: Fig. 18 X8135 The locations of the
Page 22 and 23: Gothenburg Automatic Transit Exchan
Page 24 and 25: Fig. 3 x 8181 Block schematic of gr
Page 26 and 27: Fig. 6 122 x 8180 Block schematic o
Page 28 and 29: Fig. 8 X 2472 Link circuits for ori
Page 30 and 31: Fig. 10 X8182 Traffic supervisor's
Page 32 and 33: Fig. 2 X8167 Relay switchboard AMD
Page 34 and 35: 130 Priority The switchboard is des
Page 36 and 37: Crossbar Exchange Installed on Larg
Page 40: The Ericsson Group Associated and c

1959 - History of Ericsson - History of Ericsson

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