Secondary nodes will connect to the primary nodes and transfer power and bandwidth to sensor networks. They are scheduled for deployment in 2013 using an ROV.
--Graphic credit: OOI RSN and Center for Environmental Visualization, University of Washington
The main junction box (J-Box) for the RSN system is a Medium Power J-Box (MP J-Box) that receives input voltage at 375 Volts DC and an input data link at 1 GigE. The MP J-Box has one expansion port that passes on the 375 Vdc and 1 GigE data link. This port can be connected to another Medium Power J-Box, or to other specialized equipment that requires higher power or bandwidth, e.g., inductive power coupler systems in docking stations for charging batteries in mobile platforms, or high-definition cameras. In addition, the MP J-Box has eight instrument ports that provide 12 to 48 V and has 10/100BASE-T, RS232 or RS485 data links. There will be 13 Medium and Low Power Junction boxes on the system.
During the VISIONS'13 UW-OOI-NSF Expedition, three medium-powered junction boxes were installed and fully tested - all are fully functional and await connection to the Primary Nodes. The installed junction boxes include: MJ01A at Slope Base; MJ03B at the ASHES hydrothermal field, and MJ03E at Central Caldera.