Hi  GBIC actually stands for Gigabit Interface Converter, These were the original 1GB adapters and used SC type connectors, the term GBIC is commonly used for all adapters these days, It would be very rare today to find a device that uses these type of adapters.  SFP stands for small form pluggable, and typically use LC type connectors, these were smaller then the SC connectors allowing for higher port density on the switches      SFP+ supports speeds at 8GB and higher depending on the SFP
Can anyone explain the difference between GBIC and SFP. Also the difference between SFP and SFP+.
Can anyone explain the difference between GBIC and SFP.