The Cisco GLC-SX-MMD is a hot-swappable, small form-factor pluggable (SFP) transceiver that delivers reliable 1 Gbps connectivity over multimode fiber (MMF). Featuring Digital Optical Monitoring (DOM), this module allows real-time monitoring of critical parameters such as optical output power, input power, temperature, laser bias current, and supply voltage.
It is an enhanced version of the GLC-SX-MM, offering extended diagnostics while maintaining full compatibility with Cisco networking devices.
🔧 Technical Specifications
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Model: GLC-SX-MMD
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Type: Gigabit SFP transceiver
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Standard: IEEE 802.3z 1000BASE-SX
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Data Rate: 1 Gbps
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Wavelength: 850 nm
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Fiber Type: Multimode Fiber (MMF)
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Max Distance:
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Up to 550m on OM2 (50 µm MMF)
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Up to 220m on OM1 (62.5 µm MMF)
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Connector: LC duplex
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Digital Optical Monitoring (DOM): Supported
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Hot-Swappable: Yes
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Operating Temperature: 0°C to 70°C (32°F to 158°F)
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Compatibility: Cisco Catalyst, Nexus, and other Cisco networking platforms
✅ Key Features
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Provides low-cost Gigabit connectivity over MMF
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DOM support for real-time diagnostics and proactive monitoring
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Backward compatible with GLC-SX-MM
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Compact and hot-swappable design for easy deployment
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Compatible with a wide range of Cisco switches and routers









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