The Equinox 210120 is a Serial DCE Adapter that bridges RJ-45 and DB-9 serial connections in a single passive adapter. One end presents a 1 x RJ-45 Female connector, while the other presents a 1 x 9-pin DB-9 Female connector, making it a direct interface solution for equipment requiring an RJ-45 to serial conversion. Classified as a network adapter with an RJ-45/Serial adapter type, the 210120 suits environments where terminal servers, multiport serial controllers, or similar Equinox Systems hardware must connect to serial DCE devices through standard RJ-45 cabling infrastructure.