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ERICSSON REVIEWNUMBER 2 1978 VOLUME 55Copyright Telefonaktiebolaget LM EricssonPrinted in Sweden, Stockholm 1978RESPONSIBLE PUBLISHER DR. TECHN. CHRISTIANJACOB/EUSEDITOR GUSTAF O. DOUGLASEDITORIAL STAFF FOLKEEDITOR'S OFFICE S-12625BERGSTOCKHOLMSUBSCRIPTION ONE YEAR $6.00 ONE COPY $1.70PUBLISHED IN SWEDISH, ENGLISH, FRENCH ANDSPANISHContents42 • Saudi Arabia-the Largest Telephone Project in the World46 A New Generation of Power Supply Equipment, Type BZD 11258 • Operational Experience from the Mollison International SwitchingCentre in London66 • Laser Activities at LM Ericsson76 • Digital Multiplex Equipment for 8 and 34 Mbit/s Line SystemsCOVERTransistors with cooling flanges in the boosterconverter that forms an essential part of LM Ericsson'snew power supply system. The oscilloscopecurves represent control pulses in the convertercontrol system.
Page 4 and 5: Saudi Arabia—the LargestTelephone
Page 6 and 7: Fig. 4. Telephone set D1AVOXnetwork
Page 8 and 9: A New Generation of Power SupplyEqu
Page 10 and 11: 48Fig. 4Thyristor rectifier, BMT 31
Page 12 and 13: 50Fig. 7Booster converter, BMR 263,
Page 14 and 15: Fig. 11Distribution equipment BMG 6
Page 17 and 18: 55Fig. 18Parallel cooling. This met
Page 19 and 20: 57^complete plan, modu le with the
Page 21 and 22: 59ROWLAND W BUTTONHead of Network C
Page 23 and 24: Table 3Service observations of inte
Page 25 and 26: 63For an ISC as large as Mollison t
Page 27 and 28: 65Some other observationsIn an 8 00
Page 29 and 30: 67GORAN DAHLorders for more than 10
Page 31 and 32: 69improvement of the old Centurion
Page 33 and 34: 71certain level the threshold for d
Page 35 and 36: 73V. Furthermore this optimum bias
Page 37 and 38: 75viewing into the beam of an Nd-la
Page 39 and 40: 77STIG KARLSSONWALTER WIDLTransmiss
Page 41 and 42: Fig. 7Typical values for tolerable
Page 43 and 44: 81Fig. 11Spectrum distribution of 8
Page 45: 83Technical dataZAK 30/120-2 ZAK 12
Page 48: TELEFONAKTIEBOLAGET LM ERICSSONISSN

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