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 ...

A local telephone company switching center. There are two types of central offices (COs). The first is called an "end office" (EO) or "local exchange" (LE) and connects directly to the outside ...

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 ...