Certificates
Certification	MSA, RoHS
Features
Product colour	Metallic
Housing material	Metal
Hot-Plug support
Logistics data
Shipping (inner) case length	36 cm
Shipping (inner) case width	26 cm
Shipping (inner) case height	31 cm
Shipping (inner) case net weight	3.2 kg
Products per shipping (inner) case	50 pc(s)
Pallet gross weight (air)	246.8 kg
Master (outer) cases per pallet (air)	54 pc(s)
Products per pallet (air)	2700 pc(s)
Pallet gross length	102 cm
Pallet gross width	122 cm
Pallet height (air)	199 cm
Pallet gross weight (sea)	246.8 kg
Master (outer) cases per pallet (sea)	54 pc(s)
Products per pallet (sea)	2700 pc(s)
Pallet height (sea)	199 cm
Shipping (inner) case gross weight	4.2 kg
Harmonized System (HS) code	85369010
Operational conditions
Operating temperature (T-T)	0 - 40 °C
Storage temperature (T-T)	-40 - 85 °C
Packaging data
Package width	74 mm
Package depth	131 mm
Package height	49 mm
Package weight	64 g
Performance
SFP transceiver type	Fiber optic
Maximum data transfer rate	1000 Mbit/s
Interface type	SFP
Fiber optic connector	LC
SFP transceiver standard	SX
Maximum transfer distance	550 m
Wavelength	850 nm
Networking standards	IEEE 802.3x
Duplex system	Full
Single-mode fiber (SMF) supported
Multi-mode fiber (MMF) supported
Power
Maximum voltage	6 V
Weight & dimensions
Width	13.8 mm
Depth	57.2 mm
Height	8.5 mm

The D-Link DEM-311GT is an SFP transceiver module for use in network switches and other Gigabit Ethernet devices. It serves as a fiber optic adapter for data transmission over fiber optic cables and enables a maximum data transfer rate of 1000 Mbit/s. The module is specifically designed for use with multi-mode fiber (MMF) and supports the 1000Base-SX standard specification, which is optimized for short to medium transmission distances. The maximum reach is 550 meters when using 50-µm or 62.5-µm multi-mode fiber optic cables. The module's wavelength is 850 nm, typical for 1000Base-SX technology. The optical connection is made via an LC duplex connector, which is industry standard for small, compact fiber connections. The module is MSA-compliant and conforms to IEEE 802.3x standards for flow control and IEEE 802.3z for Gigabit Ethernet. It supports full-duplex operation, enabling simultaneous bidirectional data transmission and increasing network efficiency.

Applications

The DEM-311GT is used in network infrastructures where a stable, high-speed connection over fiber optic cables is required. Typical applications include connecting switches, routers, or servers in local area networks (LAN), particularly in environments where copper cables are insufficient due to distance or interference. The module is suitable for use in Gigabit and Fast Ethernet switches with SFP slots. It is commonly used in office and enterprise networks, as well as in industrial or medical applications, where reliable data transmission over medium distances is required.

Features and Specifications in Detail

The module is hot-pluggable, meaning it can be inserted or replaced in the SFP slot of a device without interrupting network operation. This is particularly advantageous for maintenance tasks or when expanding existing networks. The housing is made of metal with a metallic surface, ensuring good heat dissipation and mechanical stability. Dimensions are 13.8 mm (width), 57.2 mm (depth), and 8.5 mm (height), matching the standard format for SFP modules. The maximum operating voltage is 6 V, within the specifications for SFP modules. The module is RoHS-compliant, ensuring the use of environmentally safe materials.

Technology Explained Simply

The SFP transceiver converts electrical signals into optical signals and vice versa, enabling data transmission over fiber optic cables. The use of multi-mode fiber allows for cost-effective and reliable transmission over distances up to 550 meters. The 850 nm wavelength is optimal for multi-mode fibers, providing a good balance between bandwidth and attenuation. The LC duplex connector ensures a secure and precise connection, integrating two fibers (one for transmitting, one for receiving) in a single connector. Support for IEEE 802.3x enables flow control to prevent data loss during overload.

Compatibility and Accessories

The DEM-311GT is designed for use with multi-mode fiber cables and does not support single-mode fiber. It is compatible with all devices that support an SFP slot for Gigabit Ethernet. As a complementary accessory, the D-Link DEM-310GT (1000Base-LX, single-mode) is offered, suitable for longer distances over single-mode fiber. Combining both modules allows for flexible network design, depending on requirements for reach and fiber type.

Installation and Mounting

Installation is done by simply inserting the module into the SFP slot of the network device. Due to the hot-plug feature, no network downtime is required. Connection to the fiber optic cable is made via the integrated LC duplex connector. It is important that the fiber optic cable used meets the requirements for multi-mode fiber (50 µm or 62.5 µm) to achieve the maximum reach of 550 meters.

Operational Advantages

The module provides a reliable, high-speed connection over fiber optic cable, which is immune to electromagnetic interference. The hot-plug feature enables flexible network administration, and MSA compliance ensures interoperability with devices from different manufacturers. The use of multi-mode fiber is cost-efficient and sufficient for many enterprise applications, especially in buildings or campus networks.

Operating Conditions

The module can be operated at temperatures from 0 to 40 °C. Storage is possible in the range of -40 to 85 °C, allowing flexible storage and transportation in various environments. The maximum voltage is 6 V, within the specifications for SFP modules.

Certification

The module is MSA-compliant and meets the requirements of the RoHS directive, ensuring the use of environmentally safe materials. These certifications guarantee the product's quality and environmental compatibility.

Scope of Delivery

The product is delivered as a single SFP module. The scope of delivery includes the D-Link DEM-311GT SFP transceiver module. The packaging is designed for single-unit sale and contains the module in protective packaging.