RJ10 is an 8P8C medium-sized modular connector developed by TE Connectivity. It is commonly used in telecommunications and office equipment applications. The RJ10 connector is based on the T568A wiring standard. It is commonly used in applications where a phone line connection is needed such as in a telephone splitter, telephone jack, or an in-line coupler for connecting two phone lines. It also has applications for connecting extension cords, patch cables, and other telecom related components.