Metro Ethernet

In 2006, a compact, carrier-class Metro Ethernet demarcation device from MRV delivers managed Fast Ethernet or Gigabit Ethernet carrier services with advanced network demarcation. The OS900 series is compliant with all three services defined for Metro Ethernet, including Ethernet Private Line (EPL), Ethernet Virtual Private Line (EVPL) and Ethernet LAN (E-LAN). The device was optimized to bring cost-effective VLAN-cross-connect, enhanced L2 and L3 Ethernet switching and intelligent traffic management to network demarcation, enabling carriers to provision new Gigabit services on-demand with automated real-time network traffic management.

Network demarcation, also known as the demarcation point or "demarc," refers to the physical point at which a telecommunications service provider's network ends and the end user's network begins. This point is significant as it determines who is responsible for installation, maintenance, and service.

The demarcation point often includes a physical device such as a modem, router, or similar equipment, provided and installed by the service provider. This device acts as the interface between the customer's internal network and the service provider's network.

In residential contexts, the network demarcation point might be a cable or DSL modem. In enterprise scenarios, it could be a larger piece of equipment that allows connection to high-speed or dedicated lines like T1 or T3 lines

Why Network Demarcation is Important

1. Responsibility and Ownership: It helps to clearly define who owns and is responsible for what equipment and lines. Up to the demarcation point, the service provider is responsible. Beyond that point, the customer is responsible.
2. Troubleshooting and Maintenance: In case of network problems, knowing where the demarcation point is can help determine whether the issue lies with the service provider's network or the customer's internal network.
3. Regulatory Reasons: In many jurisdictions, the demarcation point is defined by law or regulation to ensure consumers are not held responsible for maintaining or repairing infrastructure that's really part of the service provider's network.
4. Billing and Services: Services provided by the telecom company typically go up to the demarcation point. Any extensions, wiring, or equipment beyond the demarc is typically the customer's responsibility and may require additional services or fees.

Network demarcation is a key concept in telecommunications and networking that helps define responsibilities, aids in troubleshooting, and ensures a clear separation between service provider networks and customer networks.