Strowgerkytkimistä

Strowgerkytkimistä refers to a type of electromechanical telephone exchange system invented by Almon Brown Strowger. These systems were a significant advancement in telecommunications, enabling automatic switching of calls between subscribers without the need for a human operator. The core of the Strowger system is the rotary switch, also known as the Strowger switch. When a subscriber dialed a number using a rotary telephone, each pulse generated by the dial activated relays within the switch. These relays would then move a set of electrical contacts to establish a connection to the next switch in the sequence, progressively connecting to the desired destination number.

The process involved a series of interconnected switches. The first digit dialed would select a group of lines, the second digit would select a specific line within that group, and so on. This step-by-step switching mechanism allowed for a decentralized and automated telephone network. Strowger exchanges were widely adopted across the globe, forming the backbone of telephone systems for much of the 20th century. While largely replaced by modern electronic and digital exchanges, the principles of Strowger's invention laid the groundwork for many subsequent telecommunications technologies. The invention was driven by Strowger's personal frustration with perceived operator bias.