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Type:     Exchange Equipments
Place Made:     U. S. A.
Date Made:     1960
SIZE:     L134* W35* H250cm
Function/Purpose:     With the concept of jacks on manual telephone exchange, step-up telephone exchange connects the two lines used for each subscriber to two contacts, which are insulated from each other. Each ten pairs of contacts form an arc row. Every ten arc rows are stacked into a cylindrical circuit bank, whose contacts will be touched by contact brushes (called wiper). The pulse signal generated from the caller’s telephone set directly controls the wiper to vertically move to the required level and then horizontally move to the requested contact in order to accomplish the automatic switching process.
Characteristics:     In the 1960s, the development of telephone exchanges had moved into the automatic switching era. In 1963, Taiwan began using step-up telephone exchanges, whose main differences from the manual telephone exchanges were their larger capacity and a switching mechanism which could directly connect with the receiver according to the number dialed by the caller.


Text and images are provided by National Science and Technology Museum