CAT 5, short for Category 5, is a standard defined by the Electronic Industries Association and Telecommunications Industry Association (commonly known as EIA/TIA). It is the 5th generation of twisted pair network cabling that consists of four twisted pairs of copper wire terminated by RJ45 connectors. Cat5 Couplers play a key role in Networking as it allows Cat 5 cable connections and extensions with an increased data transfer rate. Discount Computer Parts Center provides you with all the tools and equipments to help you start or maintain your own network, including these high quality Cat-5E Keystone-type Inline Coupler to connect two separate Cat.5/Cat-5E cables through a RJ45 keystone coupler.