Cisco SFP-SX is a small form-factor pluggable (SFP) transceiver module designed for use with Cisco networking equipment. It is a multi-mode fiber optic transceiver that supports data rates up to 1 Gbps. It is designed to be used in Gigabit Ethernet and Fiber Channel applications. It is compatible with both single-mode and multi-mode fiber cables and is hot-swappable, allowing for easy installation and maintenance. The SFP-SX is a cost-effective solution for connecting two devices over a fiber optic link. It is an ideal choice for connecting switches, routers, and other networking equipment.