The 5557730-1 is a 8P8C 1-port Cat3 shielded thru-hole RJ45 Modular Jack with panel stops and panel and PCB ground options, top entry. It meets 1000V dielectric requirement contact to contact and designed for direct mounting on pc boards. It has phosphor bronze plated with gold in contact area and tin-lead on solder tails over nickel under-plate contacts, polyester, polyphenylene sulphide or high temperature nylon material and finish housing.