Oceanic Systems Micro Trunk to Micro Drop Tee Adapter - 3802Oceanic Systems Micro Trunk to Micro Drop Tee Adapter 3802 The NMEA2000 network comprises of a single trunk or backbone cable running through the length of the vessel with Tee Adaptors positioned where devices are to be attached to the network and a terminator at each end. The trunk or backbone cable can be created by either using made up cables or cordsets that come in a range of lengths or by running bulk cable and using field installable connectors