The service processor serial management port is marked SER MGT. This port is the farthest left RJ-45 port on the rear panel.
Note - The cable and DB-9 RJ-45 adapters are for the host serial port, and not for the server SER MGT port.
Use this port for server management. This port is needed to set up the service processor network management port, as detailed in Enable the Service Processor Network Management Port.
Note - Use the service processor serial management port only for server management. It is the default connection between the service processor and a terminal or a computer.