what is keystone jack and applictions of Keystone Jack A keystone jack is a small, rectangular module used in computer networking and telecommunications to connect cables to a wall plate or patch panel. It is called a "keystone" because it is designed to fit into a standardized opening in a wall plate or patch panel that is also called a keystone port. Keystone jacks come in various types, such as RJ45 for Ethernet networking, RJ11 for telephone...