Figure 6-34.--Four wire banks and associated wipers shown in the X2 position.

connections to the system circuitry. Figure 6-34 shows

S, and HS wipers advance into the wire banks to the

a simplified schematic diagram of the four 10- by

desired position (fig. 6-35).

10-wire banks and the XX-X wire banks in the normal.

Principles of Linefinding

When one wiper of the XY switch is in a given position

in its 10- by 10-wire bank, the other three wipers are

Linefinding is actually the process used to

in the same position in their respective 10- by 10-wire

connect one telephone line station to another. Since all

banks. As the switch steps a certain number of steps

the line stations will not be in use at the same time, it

in the X direction (fig. 6-35), the XX-X wipers

would be impractical to have a switch for each line

advance the same number of steps into the XX-X wire

station. Therefore, to reduce system complexity and

banks. As the switch steps in the Y direction, the T, R,

Figure 6-34.--Four wire banks and associated wipers shown in the X2 position.

Figure 6-35.--Four wire banks and associated wipers shown in position 26.