Description
Cisco GLC-SX-MMD SFP (mini-GBIC) Module
The Cisco GLC-SX-MMD SFP module is a versatile, industry-standard 1000BASE-SX transceiver designed to deliver reliable Gigabit Ethernet connectivity over multimode fiber. This hot-swappable mini-GBIC plugs into a Cisco switch, router, or other 1000BASE-SX capable port, linking your network to the backbone with minimal downtime and maximum flexibility. Built to Cisco’s rigorous compatibility and quality standards, the GLC-SX-MMD is a staple for campus networks, data centers, and branch offices seeking scalable, future-proof fiber access. Its compact form factor, LC duplex connector, and 850 nm high-efficiency VCSEL transmitter enable high-performance links across medium-length fiber runs. With Digital Optical Monitoring (DOM) support for real-time diagnostics and a plug-and-play design, this SFP module simplifies maintenance, improves visibility, and reduces mean time to repair in busy network environments. Whether you’re upgrading from copper to fiber, expanding the reach of your LAN, or deploying a new VLAN segment, the Cisco GLC-SX-MMD is built to deliver dependable, cost-effective Gbps connectivity while preserving network performance and reliability.
- High-speed, reliable link: Delivers 1 Gbps Ethernet performance via 1000BASE-SX, enabling efficient Gigabit connectivity over existing multimode fiber infrastructure.
- Multimode fiber with 850 nm transmission: 850 nm VCSEL transmitter optimized for multimode fiber links, delivering strong signal quality across standard office, campus, and data-center environments.
- LC duplex connector for easy integration: Standard LC duplex interface ensures compatibility with a wide range of fiber patch cords and Pico/Splice connections.
- Digital Optical Monitoring (DOM) support: Real-time optics diagnostics for link health, temperature, bias current, and transmit power, helping you proactively manage fiber links.
- Hot-swappable and Cisco-tested: Designed for plug-and-play installation with minimal downtime, backed by Cisco quality and broad interoperability within Cisco ecosystems.
Technical Details of Cisco GLC-SX-MMD SFP
- Model: Cisco GLC-SX-MMD SFP (mini-GBIC)
- Data Rate: 1.25 Gbps (1000BASE-SX)
- Wavelength: 850 nm
- Fiber Type: Multimode fiber (MMF)
- Connector: LC duplex
- Maximum Distance: Up to 550 meters on typical MMF (distance varies with fiber type and quality)
- Digital Optical Monitoring (DOM): Yes, for ongoing link diagnostics
- Hot-swappable: Yes, designed for easy insertion and removal with devices powered on
- Operating Temperature (commercial): 0°C to 70°C (typical commercial-grade range)
- Compatibility: Interoperates with devices that support 1000BASE-SX SFP optics; best results achieved within Cisco ecosystems and vendor-supported environments
How to install Cisco GLC-SX-MMD SFP
Installing the Cisco GLC-SX-MMD SFP is straightforward and designed to minimize downtime. Follow these steps to ensure a clean, reliable installation that preserves link integrity:
1) Power and prepare: If your network device supports hot-swapping, you can insert the SFP while the device is powered. If you prefer to halt traffic, power down only the device or the specific port per your organization’s maintenance window.
2) Remove the dust cap: Before installation, remove the protective dust cap from the SFP module and inspect the port on the switch or router for any debris. Keep the dust cap handy to protect the connector when the module is removed later.
3) Align and insert: Hold the module by its edges and align the module with the SFP slot on the device. Gently insert straight into the receptacle until you hear or feel a click, indicating the module is securely seated. Do not apply excessive force, and avoid wiggling the module once seated.
4) Connect the fiber: Attach a clean LC duplex multimode fiber patch cord to the LC connector on the SFP. Ensure the patch cord is the appropriate length for your topology and that the fiber is properly terminated. Avoid bending the fiber beyond its minimum bend radius, and keep runs as straight as possible to minimize attenuation and reflection.
5) Verify operation: Check the device’s LED indicators for link status. If your hardware supports DOM, review the module’s diagnostic data via the device’s management interface to confirm transmit and receive levels, temperature, and power metrics. For extended troubleshooting, use the CLI or GUI to query 1000BASE-SX status, and ensure the remote end is likewise configured for a compatible SFP.
6) Cable management and testing: Route fiber cables with proper strain relief, label connections for future maintenance, and perform a basic throughput test to confirm stable Gigabit performance over the link. If you encounter issues, verify fiber type compatibility, fiber quality, and the presence of any transceiver-specific compatibility notes from your device vendor.
7) Safe removal: When it’s time to replace or upgrade, gently release the module from the SFP slot, keeping the connector clean. Reinsert the new module using the same insertion steps, then recheck link status and DOM readings to confirm healthy operation.
Tips for best results: Use high-quality multimode fiber appropriate for your link length (OM1/OM2/OM3/OM4 classes), maintain stable environmental conditions, and avoid exposing the module to moisture or static discharge during handling. If you manage a mixed-vendor environment, validate interoperability and cross-compatibility with your network equipment’s documented SFP support to maintain consistent performance and warranty coverage.
Frequently asked questions
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Q: Is the Cisco GLC-SX-MMD compatible with non-Cisco switches and routers?
A: The GLC-SX-MMD is designed for Cisco devices and is optimized for Cisco optics. Many switches and routers that support 1000BASE-SX SFP optics can recognize similar transceivers, but interoperability isn’t guaranteed across all third-party hardware. Always verify compatibility with your specific model or vendor’s compatibility matrix before deployment. -
Q: What type of fiber and fiber length can I use with this SFP?
A: This transceiver uses 850 nm multimode fiber (MMF) and an LC duplex connector. Distances depend on the fiber grade (OM1/OM2/OM3/OM4) and patch cord quality; typical ranges extend to several hundred meters for standard MMF installations. For precise distance capabilities, consult your fiber specifications and Cisco product documentation for the exact link budget for your cabling. -
Q: Does this module support digital optical monitoring (DOM)?
A: Yes. DOM provides real-time optical diagnostics, including receive/transmit characteristics, temperature, and power measurements, enabling proactive maintenance and quicker fault isolation. -
Q: Can I hot-swap this SFP module on my live network?
A: Yes. The GLC-SX-MMD is designed as a hot-swappable module, allowing you to insert or remove it without powering down the entire device in most Cisco configurations. As a best practice, perform maintenance in line with your organization’s change management policy. -
Q: What warranty or support comes with this Cisco SFP module?
A: Cisco modules typically come with a standard warranty through Cisco or the seller, often including limited hardware coverage. Warranty terms can vary by region and reseller, so verify the exact coverage with your supplier at the time of purchase.
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