SFP Transceiver Cisco GLC-SX-MMD-RFB 1000Base-SX 850nm, multimode fiber, 1 Gbps

Cisco GLC-SX-MMD-RFB is an SFP transceiver module designed for 1000Base-SX fiber optic applications. Operating at an 850 nm wavelength over multimode fiber, this module delivers 1 Gbps Ethernet connectivity for compatible switches and routers with SFP ports. It is intended for short-reach fiber links in enterprise networks, data centers and campus environments to extend network segments and establish high-speed fiber uplinks.

Advantages

The Cisco GLC-SX-MMD-RFB provides standardized SFP form-factor compatibility, hot-pluggable installation and interoperability with devices that support Cisco SFP modules. The module supports 1 Gbps data rates and 850 nm multimode transmission suitable for short-distance links, enabling simple integration into existing fiber infrastructures. Its compliance with 1000Base-SX optical specifications ensures predictable performance for uplink and server connections.

Suitable for

• Short-reach multimode fiber links within enterprise LANs
• Data center uplinks and server connections requiring 1 Gbps
• Campus backbone segments between buildings over multimode fiber
• Replacement or spare SFP modules for switches and routers with SFP ports

Key specifications

• Brand: Cisco
• Model / MPN: GLC-SX-MMD-RFB
• Standard: 1000Base-SX
• Wavelength: 850 nm
• Fiber type: Multimode fiber (MMF)
• Data rate: 1 Gbps
• Form factor: SFP, hot-pluggable
• EAN: 5712505624692

How to use

Insert the Cisco GLC-SX-MMD-RFB module into an SFP slot on a compatible switch or router while the device is powered on or off (hot-pluggable). Connect multimode fiber patch cables with appropriate LC connectors to the transceiver ports, ensuring correct duplex orientation. Verify link status and negotiate 1 Gbps operation through the network device management interface. If necessary, consult the device documentation for any module enablement or configuration settings required by the host hardware.

Recommendations

Use the module with multimode fiber of appropriate grade (e.g., OM1/OM2/OM3/OM4 as supported by the network design) and maintain correct polarity and connector cleanliness. For reliable links, adhere to recommended maximum reach for 850 nm 1000Base-SX and perform optical power and loss checks during installation. Replace the dust caps when the module is not in use and store spares in anti-static packaging.