Demarc is the abbreviation of “demarcation point”. Another name for a demarc is an MPOE (minimum/main point-of-entry). This is the physical location where the customer’s equipment connects to the service provider’s equipment.
The demarc determines who is responsible for installation, maintenance, and repairs. For any equipment located before the demarc, it is the service provider's responsibility. For any equipment located after the demarc, it is the customer’s responsibility.