Consumer Electronics

TRAFFIC HANDLING CAPACITY

Both crossbar and reed relay switching depend on the opeation of a switching matrix, the principle of which can be explained by considering the circuits which are to be connected together as being arranged at right angles to each other in horizontal and vertical lines. These lines represent inlets and outlets of the switch. This idea is illustrated in Fig. 38.13. The intersections between horizontal and vertical lines are called crosspoints. At each crosspoint some form of switch contact is needed to complete the connection between horizontal and vertical lines. This is shown in Fig. 38.14. Any of the four inlets can be connected to any of the four outlets by closing the appropriate switch contacts. For example, inlet ...