If a display on the network has a LEN of 22, it can power itself entirely from the NMEA 2000 network power.

If a display on the network has a LEN of 22, it can power itself entirely from the NMEA 2000 network power.

• A. False
• B. Sometimes
• C. True
• D. Unknown

Answer: (A)

LEN is a way to measure how much of the NMEA 2000 network’s power a device is expected to use. The network has a fixed power budget (often up to about 50 LEN total across all devices). A display with a LEN of 22 is already using a sizeable portion of that budget, and in a real network there are typically multiple devices sharing power, plus possible startup surges that demand more current than the steady-state LEN value suggests. Because of that shared limit and potential peak demands, you can’t assume the display will be able to power itself entirely from network power on a typical network. So the statement is false.

LEN is a way to measure how much of the NMEA 2000 network’s power a device is expected to use. The network has a fixed power budget (often up to about 50 LEN total across all devices). A display with a LEN of 22 is already using a sizeable portion of that budget, and in a real network there are typically multiple devices sharing power, plus possible startup surges that demand more current than the steady-state LEN value suggests. Because of that shared limit and potential peak demands, you can’t assume the display will be able to power itself entirely from network power on a typical network. So the statement is false.