Termination Resistors are required on a NMEA 2000 network and are placed at each end of a network trunk cable. Like the double-ended cordsets, the termination resistors are waterproof and continue to function even while submerged in the bilge.. Diagnostic versions indicate correct polarity at a glance to ensure power connections have been made properly. Screw connector for positive connnection. Termination resistors are used to terminate both ends of the trunk line