What is the difference between GBIC, SFP, SFP+?
closed as not a real question by HopelessN00b, SvW, EEAA, mgorven, Dave M Mar 12 at 21:36
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SFP is a smaller form factor of GBIC.
Both GBIC and SFP were designed to be swappable/pluggable interfaces. SFP (small-form pluggable) is just more efficient in terms of size, with SFP+ being a compatible interface with increased speed.