there is none
The point where your ISP's network connects to your network
AT&T's demarcation point for DSL service is the loop jack on your premises. If you order the managed router option on AT&T's SDSL service, the demarcation point will be the Ethernet port on the DSL router.
Line of demarcation is where the point where ownership of the communications equipment changes from the communications carrier to the user. POP is the point where the customer connects the network data traffic to the communications carrier.
The Demarcation point
The Demarcation point
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demarcation point
demarcation point
Smart Jack
Demarcation Point
the pope drew the line of demarcation.
The telephone demarcation is where the telephone companies responsibilities end and the customers responsibilities begin. This location by federal regulations is usually at the NID box on the outside of a customers home, by the Main Point of Entry into the building that both customer and carrier can access, but ownership and responsibility can exchange.