Can a gigabit module be used with an SFP optical port
In most scenarios, an SFP module can operate in an SFP+ port, but the link will downshift to 1Gbps. The compatibility between SFP vs SFP+ largely depends on the port and module combination. The SFP port on Gigabit switches is a compact, hot-pluggable interface designed for Ethernet transmission at speeds of 1 Gbit/s and Fiber Channel systems capable of reaching 4 Gbit/s. But that simple sentence hides why engineers love them: they let you adapt link type.
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