75 ohm terminations, simulates the loss shape of 15.5 nautical miles of submarine cable in steps of 0.5, 1.0, 2.0, 4.0 and 8.0 nautical miles, used to build out the shore end section of cable to the 15 nautical mile length, coaxial connectors and terminals, encased, 10.375 in. Lg, 5.656 in. W, 3.406 in. H o/a dim.