4 ms·
How is hanging up (creating an open circuit) different than pulling the relay (creating an open circuit)?
by coin 9y ago
How is hanging up (creating an open circuit) different than pulling the relay (creating an open circuit)?
- theWatcher37 9y agoSounds like someone had god mode
- bdonlan 9y agoEven if the circuit is still open from the telco trunk to the dormitory switch, the link back to the specific extension that dialed out would be broken.
- ajross 9y agoThe phone circuit in the analog days was physical. It doesn't matter that it was open, the relays between one and and another were all connected and could be inspected. It's analogous to finding the hardware corresponding to someone's network address by being able to inspect the routing tables of all the intervening routers. Even if they turn their computer off, you can still trace them back to the physical line.
- Doxin 9y agoIIRC you could send power to the relays from the calling side, which'd keep them latched even if the callee hangs up.