olemus
sides:
teenuseandja seadmete ja abonendi seadmete vaheline piir
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in telephony, the demarcation point is the point at which the public switched telephone network ends and connects with the customer's on-premises wiring

ülevaateid
https://en.wikipedia.org/wiki/Demarcation_point

https://www.carritech.com/news/network-demarcation-point/

https://getvoip.com/library/what-is-demarcation-point/