What is a Demarc?

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.

Where Can I Find My Demarc?

The demarc is typically located in a place that is accessible for technicians. While the exact location can vary, here are some common locations for a demarc:

Different Types of Demarc Devices

Network Interface Device (NID)

The NID is the most basic demarc. The SCC contractors install the NIDs outdoors, giving technicians 24/7 access. A standard, residential NID is small and weatherproof, and it includes wiring termination, a test jack, and circuit protection.

Optical Network Terminal (ONT)

An ONT is a demarc that directly communicates with an internet service provider with fiber optic cabling. Our install technicians connect run cabling from the NID on the outside of your home to the inside where they will connect the ONT. The ONT is the device that handles the WIFI and hardline connections that connect you to the internet.

Older demarcs transmit the electrical signal on a copper line, then it sends those signals to your internet, TV, phones, and computers. Fiber optic cables work the same way, but the cable is filled with glass and uses light to transmit these signals at a much faster rate. The ONT converts these signals into electrical signals that your devices can understand. Additionallyany signals that you send out (such as uploading a video, sending an email, or making a phone call) are sent the same exact way. Thus, providing fast and synchronous upload and download speeds.