Primary Infrastructure V17

Connecting to PN3B Axial Volcano
PN1C and crab

An overhead shot of primary node PN1C near the Endurance Offshore site, along with a curious crab.

Photo Credit: NSF-OOI/UW/CSSF, Dive 1743, V14

Primary Node PN1A at Slope Base

An overhead shot from ROPOS hovering above the Slope Base Primary Node, PN1A. Photo Credit: NSF-OOI/UW/CSSF; Dive R1733; V14

Primary Infrastructure on the Regional Cabled Array includes Primary Nodes (seafloor substations) and modified telecommunication industry sub-sea fiber optic cables that provide power (10 kV DC, up to 8 A) and communications (10 Gb/s) from a Shore Station in Pacific City, Oregon to >300 miles off the Oregon-Washington coast. The Primary Infrastructure was built and installed by L-3 MariPro with an operational life expectancy of 25 years. Approximately 900 km of primary, or backbone, cable were installed in the summer of 2011 using the commercial cable laying ship,TE SubCom Dependable.

Seven Primary Nodes were installed in 2012. They are terminal points on the backbone cable that distribute power ( 8kW) and bandwidth (10 Gb/sec on each port) to areas where distributed networks of sensors are deployed and to high-power and high-bandwidth moorings that span the entire water column. Primary Nodes are placed in environmentally benign areas and extension cables extend to the scientific work sites. The Primary Nodes also function as "housekeepers" for system control, out-of-band communications, and engineering monitors. They house Medium Voltage Converters that convert the 10 kVdc primary level voltage to 375 Vdc levels. This lower power is sent to Low- and Medium-Power Nodes, part of what is called the secondary infrastructure, at the science work sites. Finally, Primary Nodes provide extra ports for future expansion that may span distances of >100 km.

The Primary Infrastructure includes the Shore Station and industry provided terrestrial fibers that run from the Shore Station to the Pittock Internet Exchange in Portand, Oregon. Data streaming live from the undersea network over the terrestrial Internet are then distributed to the University of Washington Operations Center and to Rutgers University, which hosts the Ocean Observatories Initiative Cyberinfrastructure system, including the OOI Data Portal.