The Johnson Controls 4683-TTM-1F Network Repeater is a 115V communication device designed to extend and strengthen N2 trunk network signals in building automation and HVAC control systems. It works by regenerating and retransmitting data signals, ensuring reliable communication between connected controllers across longer distances. Commonly used in commercial HVAC equipment such as ai... https://www.partshnc.com/4683-ttm-1f-johnson-controls-115v-repeater-for-n2-trunk