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D-Link DEM-331R (1000BASE-BX-U Single-Mode 40 Km SFP Transceiver)


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1000BASE-BX-U Single-Mode 40 Km (TX-1310/RX-1550 nm) SFP TransceiverDEM-331R Highly integrated transceivers for extended optical link support without any degradation in performance. Maximum 40 km fiber cable distance Compliant with IEEE 802.3z... Read more

Vendor: D-LinkSKU: DEM-331RN/ATags: D-Link, Module, Network

1000BASE-BX-U Single-Mode 40 Km (TX-1310/RX-1550 nm) SFP Transceiver

Highly integrated transceivers for extended optical link support without any degradation in performance.

  • Maximum 40 km fiber cable distance
  • Compliant with IEEE 802.3z Gigabit standard
  • Hot-swappable
  • Bi-directional TX-1310/RX-1550 nm
  • MSA, RoHS-compliant
  • Used with DEM-331T Single-Mode 40 Km SFP Transceiver


High-Speed Connectivity Meets Maximum Compatibility

D-Link Gigabit SFP Transceivers plug into Gigabit and Fast Ethernet switches via their GBIC slots. They allow for the expansion of Gigabit Ethernet networks by providing high-speed connections over a fiber-optic or twisted-pair cable. The fiber-optic transceivers have standard duplex LC connectors to provide maximum compatibility. They are hot pluggable and Small Form Factor Pluggable (SFP) compliant with the Multi-Source Agreement (MSA) specification.

Hot Pluggable

All D-Link transceivers are hot pluggable. You can connect a transceiver while the system is powered on without causing any issues, and easily swap one for another without having to reboot the switch each time. This permits modules to be added or removed without interrupting the network, facilitating maintenance and greatly reducing downtime.

Small Form Pluggable (SFP) Package

The Gigabit SFP Transceivers use the Small Form-factor Pluggable (SFP) design. They provide the necessary signal amplification for data to be transmitted to the network cable from the port, and vice versa. The SFP form factor is advantageous because it is smaller than other form factors such as Xenpak, X2, and 10G XFP, ensuring lower costs, lower power disruption, and higher port density.

Multiple Applications


The DEM-331R works in conjunction with the DEM-331T 1000BASE-BX-D Single-Mode 40 Km SFP Transceiver.

Applications of the DEM-300 Series fiber transceivers include distributed multi-processing, Gigabit switch cascading, high-speed I/O file transfer, bus extension application, and channel extender/data storage. This versatility is invaluable for an expanding network, and helps the infrastructure grow with the business.



Hot Pluggable Yes
MSA Compliant Yes
RoHS Compliant Yes
Compliant Standard IEEE802.3z
Fiber Channel FC-PI standard 100-SM-LC-L
Transceiver Type SFP
Fiber Media support Single-Mode
Distance 40KM
Speed 1.25Gbps
connector Simplex LC Connector
single/bi Direction Bi-direction
Wavelength 1310TX/1550RX
Output Optical Power (TX Optical Power) MAX.: +2dBm
Interface MIN.: -23 dBm
Input Optical Power (RX Optical Power) MAX.: -3 dBm
Sensitivity -23dBm
Cable Type single-mode 9/125um fiber
Power 3.3V
Max Input Current 300 mA
Power Budget (MIN Power Budget) 11dB
MAX Power Budget 18dB
Heat Generated 1.782kJ/h
MTBF (hours) 880,000
Operation Temperature 0~70
Storage Temperature -40~85
Humidity (Operating) 5~95
Humidity (Storage) 5~95
Dimension ( W x D x H ) 13.5*56.6*8.5
Weight 21+/-1g
Hardware version B1



Shipping/Delivery Method Cost  Lead Time Delivery Period
Self Collection Free   2 Working Days  Monday to Saturday
Standard Shipping Orders below $800 = $15 5 Working Days Monday to Friday
     Orders above $800 = FREE


For Self Collection, Please call our customer service hotline (+65 6262 0402) prior to coming down. Our store is located at 2 Gambas Crescent #06-21,
Nordcom II, Singapore 757044

Delivery/ self collection may take a longer time to reach you during this time and throughout campaigns and festive season.

All goods purchased from can only be delivered to addresses within Singapore main island. We are unable to deliver to Jurong Island, Army Camps, Changi Airport, Tuas, Fisher Ports and etc.

We do not deliver outside Singapore or to post office boxes.

For products fulfilled by external vendors (Backorder), please refer to the individual product listing for more shipping information.

For more information, you may reach us via email to

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D-Link DEM-331R (1000BASE-BX-U Single-Mode 40 Km SFP Transceiver)