101 Electronic Switching System (ESS), has been developed to provide telephone switching service for business customers. A field trial system has recently been installed. This system is compatible ...

A telephone central office switch that connects directly to the customer. Also called a "Class 5 switch" or "TDM switch," an end office switch is a computer specialized for TDM-based, circuit ...

This repair/tutorial video by the telephone Connections Museum of ... and how they went about fixing it. As central office switching became more complex and more dense, the manual methods of ...