Phone system notes

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Mobile style

See Electronics notes/Cell phone notes


Landline style

POTS usually refers to Plain Old Telephone Service - often meaning in context of phones or acoustic modems, and in the last case often in contrast with broadband internet.

https://en.wikipedia.org/wiki/Plain_old_telephone_service


PSTN (Public switched telephone network) carries a similar meaning.

https://en.wikipedia.org/wiki/Public_switched_telephone_network



Connecting phones or modems together

Hybrids

Dialing

Devices on a line

https://en.wikipedia.org/wiki/Caller_ID



Notes on basic service, phone line switching, and dialing