User:Wrytoast/Books/North American Telephone Exchanges

compiled, revised, and edited by Lucas McNeeley

 * Early Electromechanical Systems
 * Pulse (signal processing)
 * Relay
 * Junctor
 * Telephone switchboard
 * Strowger switch
 * Common control
 * Director telephone system
 * Panel switch
 * Panel call indicator


 * Later Electromechanical Systems
 * Crossbar switch
 * Reed relay
 * Wire spring relay
 * Number One Crossbar Switching System
 * Number Five Crossbar Switching System


 * Processor-Controlled Analog Switches
 * Stored program control
 * Traffic Service Position System
 * Number One Electronic Switching System
 * SP-1 switch
 * No. 4 Electronic Switching System


 * Digital Switching
 * EWSD
 * Siemens DCO
 * 5ESS Switching System
 * GTD-5 EAX
 * DMS-100