Ethernet media convertors typically have two ports: one for the copper cabling and one for the fiber opting cabling When a signal is received on one port, it is converted to the appropriate format for the other port. For instance, a signal received on the copper port is transformed into an optical signal before being sent across the fiber optic connection. Conversely, when a signal is received on the fiber optic port, it is converted into an electrical signal for transmission over the copper cable.