In summary, TE Connectivity modular jacks and plugs are a key communications tool used in a wide variety of applications from telephones to computers, to switches and servers. Growth of Ethernet-based equipment will be steady as more and more devices are added to the network. Modular connector or modular jack is the name given to a family of electrical connectors originally used in telephone wiring and now used for many other purposes. The RJ point five connector system is the next generation Ethernet link, offering double the amount of standard RJ45 connections in the same real estate.