01135    a2200217   4500003000500000005001700005010001600022020002400038020001700062040000900079082001200088100001900100245006400119250001200183260004800195300002900243500002000272505056000292538002900852650003600881Nust20170207153244.0  a   80028236  a0830612785 (pbk.) :  a0830696350 :  cNust00a621.3821 aHobbs, Marvin.10aModern communications switching systems /cby Marvin Hobbs.  a1st ed.  aBlue Ridge Summit, Pa. :bTab Books,c1981.  a308 p. :bill. ;c22 cm.  aIncludes index.  aThe Slow Push for Progress (Page-7) Basic Switching and Traffic Concepts (Page-19) Logic Switching Algebra and Control (Page-39) Circuit Switches and Relays for Speech (Page-56) Control and Signal Methods (Page-78) Modern Step-by-Step and Rotary Exchanges (Page-104) Electromechanical Crossbar Systems (Page-128) Electronic Exchanges with Wired Logic (Page-142) The Elements of Stored Program Control (Page-162) Typical SPC Exchange Switching Systems (Page-199) Data and Telex Switching (Page-215) Automatic Private Branch Exchanges (Page-229).             aAlmirah No.36 Shelf No.5 0aTelecommunications engineering.