Premium grade underwater cable designs for various oceanoghraphic instrument equipment applications Data pairs: Shielded twisted pairs with aluminum/mylar shield, drain wire and shield isolation. Pairs are designed for RS232, RS422, RS485 signal rates Cable cores: Composite constructions with isolated shielded data pairs cabled with single power/control wires and interstices filled with thermoset waterblock Strain Relief : Overall synthetic fiber strength layer with rating listed below. 800 lb. break strength. ecommended safe work load not to exceed 20% of break strength. Jacket : Flexible premium grade black polyurethane rated for long term subsea deployment