Cisco SFP (Small Form-Factor Pluggable) modules are hot-swappable I/O devices that plug into SFP slots on Cisco networking equipment. They are used for connecting network devices with fiber optic or copper cabling. There are a wide variety of Cisco SFP modules available, each with different features and functionalities. Here are some of the most common Cisco SFP modules with their part numbers:
GLC-T: 1000BASE-T SFP copper transceiver module for Gigabit Ethernet over twisted-pair cabling (up to 100 meters).
GLC-SX-MM: 1000BASE-SX SFP multimode fiber transceiver module for Gigabit Ethernet over short distances (up to 500 meters).
GLC-LH-SM: 1000BASE-LX/LH SFP single-mode fiber transceiver module for Gigabit Ethernet over long distances (up to 10 kilometers).
SFP-10G-SR: 10 Gigabit Ethernet SFP+ short-range multimode fiber transceiver module for 10 Gigabit Ethernet over short distances (up to 300 meters).
SFP-10G-LR: 10 Gigabit Ethernet SFP+ long-range single-mode fiber transceiver module for 10 Gigabit Ethernet over long distances (up to 10 kilometers).