It is used for short-range multi-mode fiber optic connections with a maximum distance of 550 meters.

The Cisco GLC-SX-MM operates on ordinary multi-mode fiber optic link spans of up to 550 m in length.A 1000BASE-BX10-D device is always connected to a 1000BASE-BX10-U device with a single strand of standard SMF with an operating transmission range up to 10 km. Additional charges may apply dependant on location, floor standing cabinets and other heavy/bulky items. The GLC-SX-MMD SFP Module is Cisco’s industry-standard SFP and is a hot-swappable input/output device that plugs into a Gigabit Ethernet port/slot, linking the port with the fiber-optic network.

The GLC-BX40-D-I, GLC-BX40-DA-I, and GLC-BX40-U-I SFPs also support Digital Optical Monitoring (DOM) functions according to the industry-standard SFF-8472 Multisource Agreement (MSA). All GBICS products are CE Marked and RoHS compliant to meet the European safety directives and have passed certification for Laser Safety in UKAS accredited laboratories. Featuring low power consumption, this industrial optic transceiver provides 1GBASE Ethernet connectivity options for Gigabit Ethernet, Telecom and Data Centers, suitable for both outdoor and indoor deployments. Cisco Capital can help you acquire the technology you need to achieve your objectives and stay competitive.compatibility matrix for the latest information and for the Cisco compatible operating system for each platform. A 10-dB inline optical attenuator should be inserted between the fiber-optic cable plant and the receiving port on the SFP at each end of the link whenever the fiber-optic cable span loss is less than 8 dB. It came into force on 1st June 2007 and replaced a number of European Directives and Regulations with a single system.