In typical NMEA 2000 network layouts, the backbone is powered from one end.

• A. Power is supplied equally from both ends.
• B. Power is supplied from the middle only.
• C. Power feed can be at any end or both ends.
• D. Power feed is often from one end.

Answer: (D)

In a NMEA 2000 network, the backbone is the main trunk that carries the data bus and from which devices tap in. Powering the backbone from one end keeps the supply voltage uniform along the length and minimizes voltage drop as you move toward the far end. This single-end power setup also avoids creating multiple injection points that could introduce unequal voltages or unwanted current paths, which helps keep devices operating reliably on the same bus. In practice, you place the power feed at one end and maintain terminators at both ends of the backbone to preserve signal integrity. While other arrangements are possible in theory, the common and reliable approach is to feed power from one end.