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Gareth Whitman
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Simple fiber converter that works reliably for long distance links.
DFE-851
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D-Link 1 port 100Base-TX to 100Base-FX 100M Ethernet photoel...
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DFE-851
- Description:
- D-Link 1 port 100Base-TX to 100Base-FX 100M Ethernet photoelectric converter, simple version, single-mode dual-fiber, SC interface, maximum transmission 15Km, wavelength 1310nm
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- Brand:
- D-Link
- GTIN:
- 8859100267965
- Condition:
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DFE-851 Overview
DFE-851 is a high-performance SFP transceiver engineered to deliver a reliable 10G data rate through an LC connector interface. It is designed for short-range transmission over single-mode fiber, making it ideal for use in data centers, enterprise networks, and telecom applications while supporting Ethernet protocols.
This compact transceiver features standardized physical dimensions and robust environmental tolerances to ensure dependable network performance. Its compatibility with top-tier vendors and optimized power consumption further establish the DFE-851 as a trusted solution for high-speed optical interconnects.
DFE-851 price is is available on request. Get immediate quote.
Request bulk order quote for DFE-851 for additional pricing. Browse the full D-Link Transceivers series or explore all D-Link products.
DFE-851 Specifications
- Product Type
- Transceiver
- Form Factor
- SFP
- Data Rate
- 10G
- Connector Type
- LC
- Wavelength
- 1310 nm
- Transmission Distance
- Short-Range
- Fiber Type
- Single-mode
- Max Distance
- 10 km
- Supported Protocols
- Ethernet
- Network Interface
- Fiber
- Power Consumption
- 3.5W
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Compatibility
- Cisco, Juniper, Huawei, Arista
- Product Name
- DFE-851 10G SFP Transceiver
- Height
- 0.7 inches
- Width
- 0.5 inches
- Depth
- 0.9 inches
- Weight
- 0.1 lbs
DFE-851 Use Case
Remote SCADA System Networking in Oil & Gas Facilities
In pipeline monitoring sites located up to 12 km from the central control room, the DFE-851-D-Link 1 port 100Base-TX to 100Base-FX 100 M Ethernet photoelectric converter (simple version, single-mode dual-fiber, SC interface, 1310 nm) provides a stable, EMI-free fiber link. This deployment ensures real-time SCADA telemetry, minimizes signal loss over long distances, and enhances operational safety and asset reliability.
Multi-Building Enterprise Campus Backbone Extension
For corporate campuses spanning multiple buildings separated by up to 15 km, the DFE-851-D-Link 1 port 100Base-TX to 100Base-FX 100 M Ethernet photoelectric converter (simple version, single-mode dual-fiber, SC interface, 1310 nm) seamlessly extends existing networks over fiber. By converting copper RJ45 to single-mode fiber optics, it delivers high-speed, interference-resistant connectivity, simplifies infrastructure, and reduces operational costs while supporting core business applications.
Data Center Disaster Recovery Link over Metro Fiber
Between primary and secondary data centers located 14 km apart, the DFE-851-D-Link 1 port 100Base-TX to 100Base-FX 100 M Ethernet photoelectric converter (simple version, single-mode dual-fiber, SC interface, 1310 nm) establishes a dedicated, low-latency fiber link. This solution enables real-time replication of virtual workloads and backup data, ensuring business continuity, regulatory compliance, and rapid failover in disaster recovery scenarios.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| DFE-851 |  DMC-2000-PW-AC |  DMC-1200 |  DMC-300SC |  DEM-431XT | |
|---|---|---|---|---|---|
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Form Factor | SFP | SFP+ | SFP | SFP | XFP |
| Data Rate | 10G | 10G | 10G | 1G | 10G |
| Connector Type | LC | LC | LC | SC | LC |
| Wavelength | 1310 nm | 1310 nm | 1310 nm | 850nm | 1310 nm |
| Transmission Distance | Short-Range | Long-Range | Long-Range | Short-Range | Long-Range |
| Fiber Type | Single-mode | Single-mode | Single-mode | Multi-mode | Single-mode |
| Max Distance | 10 km | 10 km | 80 km | 300 meters | 80 km |
| Supported Protocols | Ethernet | Ethernet | Ethernet | Ethernet | Ethernet, Fibre Channel |
| Network Interface | Fiber | Ethernet | Fiber | Ethernet | Fiber |
| Power Consumption | 3.5W | 3.8 W | 3.5W | 3.5W | 3.5W |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Compatibility | Cisco, Juniper, Huawei, Arista | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista |
| Product Name | DFE-851 10G SFP Transceiver | DMC-2000-PW-AC | DMC-1200 Optical Transceiver | DMC-300SC Digital Media Converter | DEM-431XT 10G XFP Optical Transceiver |
| Height | 0.7 inches | 0.87 inches | 0.22 inches | 0.45 inches | 0.6 inches |
| Width | 0.5 inches | 0.55 inches | 0.87 inches | 1.20 inches | 1.2 inches |
| Depth | 0.9 inches | 3.56 inches | 1.1 inches | 1.70 inches | 1.8 inches |
| Weight | 0.1 lbs | 0.3 lbs | 0.10 lbs | 0.10 lbs | 0.15 lbs |
Reviews & Ratings
S
Sadia Rehman
4
Stable connection once paired correctly. No dropouts experienced.
H
Hugh Lawson
4
Good value converter for extending Fast Ethernet.
U
Usman Khalil
4
Consistent signal quality across our link.
P
Paul Dennison
4
Reliable and easy to deploy.
Questions & Answers
What is the D-Link DFE-851 Ethernet photoelectric converter?
The DFE-851 is a 100Base-TX to 100Base-FX photoelectric converter featuring one 100 Mbps RJ-45 port and one single-mode dual-fiber SC port for up to 15 km at 1310 nm.
Which applications does the DFE-851 support?
It supports long-haul fiber connectivity for enterprise LANs, campus backbones, Metro Ethernet, video surveillance and industrial automation requiring reliable 100 Mbps links.
What interfaces are available on the DFE-851?
Equipped with one 100Base-TX RJ-45 copper port and one 100Base-FX SC fiber port, it facilitates seamless Ethernet-to-fiber conversion at 100 Mbps.
What is the maximum transmission distance of the DFE-851?
It delivers up to 15 kilometers of single-mode fiber transmission at 1310 nm without additional extenders or amplifiers.
Which fiber type and wavelength does the DFE-851 use?
Utilizes single-mode dual-fiber SC connectors at a central wavelength of 1310 nm for optimized long-distance Ethernet performance.
Does the DFE-851 support auto-negotiation?
Yes, it supports auto-negotiation on the 100Base-TX port to automatically set the correct speed and duplex mode.
How do I install the DFE-851?
Installation is plug-and-play: connect the RJ-45 port to a switch or NIC, attach single-mode SC fibers to the FX port and plug in a 5 V DC power adapter.
What power requirements does the DFE-851 have?
Requires an external 5 V DC power supply (5 W max), providing stable operation for the converter module.
How can I monitor link and activity status?
Three LEDs indicate Power, TX Link/Activity and FX Link/Activity, offering instant diagnostics of electrical and fiber connections.
What environmental conditions does the DFE-851 support?
Designed for 0 °C to 50 °C operating temperature and 5% to 95% non-condensing humidity for standard indoor deployments.
How does the DFE-851 ensure data integrity and safety?
Offers 1500 V DC electrical isolation between copper and fiber ports to protect against surges and guarantee signal quality.
Can the DFE-851 be used in telecom closets and server rooms?
Yes, its compact fanless metal housing fits standard telecom racks, server rooms and compact network closets.
What is the MTBF of the DFE-851?
Boasts an MTBF (Mean Time Between Failures) of over 500,000 hours, delivering high reliability for critical network applications.
How do I troubleshoot link issues on the DFE-851?
Verify proper fiber polarity, check LED indicators, test cable continuity and confirm matching speed/duplex settings on connected devices.
Is the DFE-851 backward-compatible with lower speeds?
It is optimized for 100 Mbps operation and does not support 10 Mbps connectivity on either the copper or fiber port.
What warranty and support does D-Link offer for the DFE-851?
Backed by D-Link’s limited lifetime warranty, 24/7 technical support and comprehensive online resources including user guides and firmware updates.