What Is Combo SFP Port?

The combo port is a single interface with dual front ends – RJ45 port or SFP port, so it supports both copper and optical SFP connections. In other words, the combo port is a compound port that can support two different physical ports, share the same switch fabric and port number. But these two different physical ports cannot be used simultaneously. Each dual combo port is a single interface that offers a choice of two connections: an RJ-45 connection for a copper Ethernet cable and an SFP connection for a fiber optic cable. For instance, the combo SFP port is being used in a Gigabit switch, then the corresponding copper port is automatically disabled and vice versa.