D-Link 1-Port SFP SX MM Fiber Transceiver 1000BASE-SX (DEM-311GT)

The D-Link DEM-311GT is a high-performance 1-port SFP (Small Form-factor Pluggable) transceiver designed for Gigabit Ethernet over multimode fiber. Operating at 850nm wavelength, it supports full-duplex 1000BASE-SX connections over distances of up to 550 meters on 50µm fiber or 220 meters on 62.5µm fiber. Its hot-pluggable design with a durable metal housing ensures low EMI interference, making it ideal for enterprise networks, data centers, and high-density environments.

Product Features

Gigabit Full-Duplex Connectivity

Supports 1000BASE-SX standard for high-speed, full-duplex Gigabit Ethernet over multimode fiber.

Duplex LC Connector

Equipped with a duplex LC interface for easy and secure fiber connections.

Multi-Mode Fiber Support

Operates over both 50µm and 62.5µm multimode fiber for flexible deployment across short-range networks.

Long-Distance Transmission

Supports distances up to 550 meters on 50µm fiber and 220 meters on 62.5µm fiber, ideal for campus and building networks.

Hot-Pluggable Design

Allows installation or replacement without powering down network devices, minimizing downtime.

EMI-Resistant Metal Housing

Durable metal enclosure reduces electromagnetic interference for reliable network performance.

Optical Receiver Sensitivity

High sensitivity of -18 dBm ensures strong signal reception across supported distances.

Compliance and Safety

Class 1 laser product, compliant with EN 60825-1 and FDA 21 CFR 1040.10 & 1040.11 standards.

Product Specifications

• Product Type: SFP (Mini-GBIC) Fiber Transceiver
• Model: DEM-311GT
• Standard: 1000BASE-SX, IEEE 802.3z
• Connector Type: Duplex LC
• Duplex: Full-Duplex
• Fiber Type: Multimode Fiber (50µm / 62.5µm)
• Maximum Distance: 550 m (50µm), 220 m (62.5µm)
• Wavelength: 850 nm
• Supply Voltage: 3.1–3.5 V (Max 6 V)
• Max Current: 300 mA
• Hot-Pluggable: Yes
• Optical Receiver Sensitivity: -18 dBm
• Laser Classification: Class 1 (EN 60825-1, FDA 21 CFR 1040.10 & 1040.11)
• Housing: Metal enclosure for EMI reduction
• Dimensions (WxDxH): 13.8 x 57.2 x 8.5 mm