Which statement correctly describes the maximum backbone lengths for Heavy, Mid, and Lite cables?

Which statement correctly describes the maximum backbone lengths for Heavy, Mid, and Lite cables?

• A. Heavy=250m, Mid=250m, Lite=100m
• B. Heavy=250m, Mid=250m, Lite=200m
• C. Heavy=200m, Mid=250m, Lite=100m
• D. Heavy=300m, Mid=200m, Lite=100m

Answer: (A)

In NMEA 2000, the maximum backbone length depends on the backbone cable type because different gauges handle power delivery and signal integrity along the trunk differently. Heavier and mid-grade backbone cables can carry power with less voltage drop over a longer distance, so they’re permitted a longer backbone, while lighter cable has more resistance and losses, limiting how far the trunk can run. Therefore, the documented limits are Heavy up to 250 meters, Mid up to 250 meters, and Lite up to 100 meters. This is why that combined figure is the best match. Other options propose lengths that exceed what Lite allows or misstate the limits for the heavier cables, which would risk voltage drop, signal quality, and overall network reliability.

In NMEA 2000, the maximum backbone length depends on the backbone cable type because different gauges handle power delivery and signal integrity along the trunk differently. Heavier and mid-grade backbone cables can carry power with less voltage drop over a longer distance, so they’re permitted a longer backbone, while lighter cable has more resistance and losses, limiting how far the trunk can run.

Therefore, the documented limits are Heavy up to 250 meters, Mid up to 250 meters, and Lite up to 100 meters. This is why that combined figure is the best match. Other options propose lengths that exceed what Lite allows or misstate the limits for the heavier cables, which would risk voltage drop, signal quality, and overall network reliability.