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.6f/cARK 3/s/'60*8S00-*S999TcboUARK3l2/*0*8*00-*8*99Eckero35300-3S5399_ARK3IS/,Morby5(romsv,k^ ARK3'*/'00 ^6300^\3560O-35799GoabuARK33Sjl50*6OC0-*629$MetlontjrpARK 3 I2j*035300-35339^ICullo ARK 3t*/i035800-35639Vesiorsundo-£5Kj3tf/'S0•-Jwr~~~QJARK 335/260*8000-*8399SanqsbuPARK3/5//60799 5ibbyARK 3W/60*7300-*7*99To5crbuARK 3t*/60*6dOO-*69S9JomaloAM335/200,33000- 33339OnninyebaARK 3121*033700- 33833em5undlandARK 3/*/d0* 7000-* 7799ARK 335//605*000- ' ^39L umporlondARK 3/t/fOO3*500-3*639Vcdo—• ARK 31 it I tOO
The quality of cable construction would have suffered, since satisfactoryresults depend largely on careful and accurate planning and efficient management.The network <strong>com</strong>prises some 14,000 poles and 100 kilometres of overheadcable. Part of the plant had admittedly been reconditioned by 1952, butthe larger part of the work remained to be done.The indispensable investment in the network for the years 1953—1960was estimated at 117 million marks, covering the following average annualrequirements of materials: 1,200 impregnated poles, 9,000 kg 2 mm steelwire, and 3.5 million marks worth of cable. Linesmen's wages amount tosome 4 million marks per annum.The trunk cables consist of old 3 mm steel wire, and. on grounds ofattenuation, must in due course be replaced by 2.5 mm copper wire in manyplaces.Between group centres and terminal exchanges 2 mm copper cadmiumwire is already being used, as well as for very distant subscribers.Mariehamn—Jomala is to be loaded in the near future, and Odkarby—Mariehamn is to be provided with a carrier system, so attaining an attenuationgain of 0.2 nepers at the Odkarby group centre. Vardo is to be connectedin due course to Jomala by radio link. Subsidiary automatic exchanges andparty lines have been successfully employed where justified on economicgrounds. Nevertheless the principle has been to employ these systems onlywhen absolutely necessary for economic reasons. Such expedients alwaysimply some kind of makeshift, with the restrictions attendant thereon.The Zone CentreThe equipment needed at the zone centre at Mariehamn for mechanizationof the rural area has been procured by Mariehamns Telefon AB. A writtenagreement has been drawn up in respect to its joint use. An automaticswitchingstage of L M Ericsson's type ARM 50 (GVN) for 24 volt operationwas brought into use in September 1956. At the same time the dial lines11000-11999S.,'[RegI-GVLV<strong>1.</strong>1-6VLV12000-12999Qkj] GIV-Nx8012Fig. 3Mariehamn local exchange (linefindersS, 1st group selectors I-GV and finalselectors LV) and the transit stage oftype ARM 50 (GVN) with junctionsFIR-L and FDUKR to Mariehamn andother exchanges11
Page 3 and 4: ERICSSON REVIEWVol. XXXIV 1957RESPO
Page 5 and 6: ERICSSON REVIEWVol. XXXIV No. 1 195
Page 7 and 8: ularities serious enough to affect
Page 9 and 10: Faults at Centrum Jan.—June 1956.
Page 11 and 12: The same practice is adopted at the
Page 13: Mechanization of the Aland Telephon
Page 17 and 18: exchange, while another has perhaps
Page 19 and 20: Fig. 2 X 6975IO-pair strips(From le
Page 21 and 22: •G rLrlFig. 6The combined fuse NG
Page 23 and 24: Visual Staff Locator System for Sma
Page 25 and 26: Fig. 4 x 8008Keyset KEM 3294placed
Page 27 and 28: Traffic Signals at Vasterbron, Stoc
Page 29 and 30: Three Programme Vehicle ControlThe
Page 31 and 32: x 8009 Ordinary vehicle control imp
Page 33 and 34: TownExchangeNumberof linesTownExcha
Page 35 and 36: NEWS/romAll Quarters of the WorldL
Page 37 and 38: L M Ericsson, Midsommarkransen, isa
Page 39 and 40: 3056 .(487ricss\nUQ;Jao0-V5roc0-ft

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