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Telephone Switching Systems of North America – Main Page
Overview & Background on Electronic & Digital Switching Systems
Step-by-Step Telephone Switching Systems
Western Electric/Lucent Modern Telephone Switching Systems
Telephone Switch Timeline
Packet Softswitches – The Next Generation - Telephone World
Automatic Electric Modern Switching Systems - Telephone World
Northern Telecom/Nortel Digital Central Office Switches
Western Electric Panel Telephone Switching Systems
Western Electric Crossbar Telephone Switching Systems