How did old dial phones figure out where the call is going without having a computer inside? What is the mechanism behind the dial?
In: Technology
there are two legacy way for older thelephone to compose a number: pulse signaling and tone dial.
pulse signaling, more often found in phones with rotary dial, flip the hang button as many time as the number you put: if you want to call, let’s say the number 123, it will create the following electrical pulse on the “hang” wire: – — —.
Tone signals instead produce a sound, a note for every number you digit directly on the voice wire: it’s the “beep” you hear when you’re composing a number.
today provider sides calls are all routed on various VoIP networks but for compatibility there is a device between your old phone and their network that take the duty of converting those electrical signals into digital signals that can be managed by them.
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