GBIC (Gigabit Interface Converter) and SFP (Small Form-factor Pluggable) modules are transceivers used in networking equipment to interface with optical fiber cables.

GBIC (Gigabit Interface Converter):

• GBIC modules are hot-swappable input/output transceivers used in networking devices such as switches, routers, and network interface cards.
• They were popular in older networking equipment for connecting to optical fiber networks.
• GBIC modules are larger in size compared to SFP modules and use a standard square-shaped connector.

SFP (Small Form-factor Pluggable):

• SFP modules are an evolution of GBIC modules, designed to be smaller and more versatile.
• SFP modules are hot-swappable and support a wide range of networking interfaces, including Ethernet, Fibre Channel, and SONET/SDH.
• They use a compact, rectangular-shaped connector, allowing for higher port densities on networking equipment.
• SFP modules come in various types, including SFP, SFP+, QSFP (Quad Small Form-factor Pluggable), and QSFP28, each supporting different data rates and applications.