(= plain old telephone service,
"lihtne vana telefoniteenus")

olemus
traditsiooniline telefonside, mis põhineb
kaabelvõrgul ja analoogsignaalidel

Wiktionary:
a traditional telephony system based on analog transmission of sound, as opposed to newer alternatives like ISDN or VoIP

ülevaateid
https://www.ramcomminc.com/pots/

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

https://irp-cdn.multiscreensite.com/da0b3f62/files/uploaded/VoIP%20vs%20POTS.pdf