No. 1 ESS Section I
BelllAboratories RECORD 228 Memory Devices R. H. Meinken and L. W. Stammerjohn Two magnetic memory devices, the permanent magnet twistor and the ferrite sheet, VIIlllm,' ;'.1 • Number 6 • June 1965 store the operating intelligence of the system. 236 The Switching Network A. Feiner A very flexible network, it is actually a cross between electromechanical and elec tronic, rather than fully electronic, techniques. Contents 241 Mechanical Design D. H. Wetherell Because its great flexibility stems from the stored progmm, No.1 ESS needs fewer equipment options than any present system. PAGE 246 Power System and Ringing and Tone Plants J. W. Osmun and J. R. Montana 194 Introduction W. A. Mill' N,ti,. Solid state devices help simplify the power system and lead to the introduction of Presentin!J an ;XXII,' '11/. III" No, 110:1''1'11'111/;,' S"';I"/,;II" S,/"",,,, ,/1,,111,,· If'rlmolo!lical precision dial tones and call progress tones. and scientific d;IIWl,';1I //'11;/'11 ;1//"'" /'/1/H"';I''''', 251 A New Approach to System Maintenance R. L. Campbell and W. Thomis 196 The Evolution of Telephone SwikhinJ( 11'. Kf'ilft,·,. Automatic maintenance programs comprise over half the contents of the stored pro 'I'f~'VoIIII;on Seemingly a ;11 11'/,,/,11111/" "/1"',.",,, . .VII, 1 1o:SS ;" 111'1111111" HilllfIl'tdy in the gram and make No.1 ESS a "do-it-yourself" machine. tradition of cmnmon ('/11/1,.,,1 H//';lrll;"1/ "/1",,.1/,,,. 257 Some Magnetic Materials D.H. Wenny 204 From Morris to Succa.~unn8 fl. W. Kl'lrhl,·,II/'· A new alloy was created whole cloth for the ferreed switch while two older ones got All the vast chant/"x XI'III/I'III;/lli III,! MII,.,.i" 11'",1 11'11/11 II,,· SIl/·'·I,..~lIuua office were an entirely new magnetic dress for the twistor memory.
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