Final answer:
MT-RJ stands for Mechanical Transfer-Registered Jack. It is a type of fiber optic connector used in Ethernet networks.
Step-by-step explanation:
MT-RJ stands for Mechanical Transfer-Registered Jack. It is a type of fiber optic connector that is used primarily in Ethernet networks. The MT-RJ connector has two fibers housed in a single ferrule, with one being used for transmitting data and the other for receiving data.