Cisco GLC-SX-MM Compatible 1000BASE-SX SFP, 850nm 550m MMF

EdgeOptic's GLC-SX-MM compatible is a Cisco-coded version of the EdgeOptic 1.25G-SFP-550D multi-vendor 1000BASE-SX transceiver. It is an SFP module for duplex multimode fiber (MMF) with an LC/UPC interface, built to the IEEE 802.3z 1000BASE-SX standard and 1G Fibre Channel SW (FC-PI). GLC-SX-MM is Cisco's legacy 850nm short-reach SFP, and Cisco has since replaced it with the GLC-SX-MMD. The module is coded with Cisco-recognized EEPROM, so it is accepted on Cisco switching and routing platforms without the service unsupported-transceiver command, which makes it a drop-in replacement for equipment that originally shipped with the GLC-SX-MM.

The transmitter is an 850nm VCSEL paired with a PIN photodiode receiver. The module carries a minimum guaranteed optical budget of 7.5 dB, which supports a reach of up to 550 m over MMF. Reach is an indicative figure derived from the guaranteed optical budget and typical fiber attenuation; OM1 (62.5µm) tops out near 275 m, with 550 m on OM2 grade and above. Unlike the original no-DOM GLC-SX-MM, this compatible supports Digital Optical Monitoring (DOM/DDM) per SFF-8472, reporting transmit power, receive power, temperature, bias current, and supply voltage over the 2-wire serial interface. The module operates across the standard 0 to 70°C range at +3.3V and runs Gigabit Ethernet at 1.25 Gbps or 1G Fibre Channel at 1.0625 Gbps.

The module is CE and RoHS compliant, Class 1 laser rated, and built to the SFP INF-8074i multi-source agreement. Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms, it ships next business day from EU stock with a lifetime warranty. For deployment or cross-reference questions, contact our sales team.