Like the phones that have a special plug and everything, the cord one still work when the electricity is out and they don’t seem to have batteries in there, so how and why do they still work
In: 142
Plain old telephone services (POTS, for real) phones don’t require any power unless they’re ringing or somebody’s talking.
When you would receive a call, there’s literally a switch that closes a circuit, and from the telephone central office (CO, the closest facility serving your area) that circuit sends 105V to the phone, triggering the clapper to rattle back and forth against the bells, making it ring.
When you took the phone off the cradle, a different switch was triggered to start the lower voltage powering the ear and mouth (E&M) circuit.
Back at the CO, these switches were in two-post racks, and there were rows of batteries much like car batteries that provided the power. There was a regular power line to the CO, charging the batteries, but of course in a power outage, the batteries would keep working for some time.
If you want to keep going, https://en.m.wikipedia.org/wiki/Telephone_exchange
Latest Answers