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Name:
DFE-861/B
- Description:
- D-Link 1 port 10/100Base-TX to 100Base-FX 100M Ethernet photoelectric converter, single-mode single-fiber, SC interface, TX:1550/RX:1310nm, maximum transmission 20km, need to be used in pairs
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DFE-861/B Overview
DFE-861/B is a 10G SFP optical transceiver designed for high-speed data communications over long distances. It features an LC connector and supports both Ethernet and Fibre Channel protocols, making it ideally suited for data centers, enterprise networks, and telecom applications. Its compact SFP form factor ensures easy integration into standard network equipment while delivering robust performance.
Engineered for reliable, high-speed connectivity, DFE-861/B offers transmission over single-mode fiber for distances up to 80 km. Its precise physical dimensions—designed to conform to standard SFP slot requirements—coupled with energy-efficient operation, make it an optimal solution for organizations seeking dependable long-range connectivity in demanding network environments.
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Explore more options from Transceivers or explore other D-Link products.
DFE-861/B Specifications
| Product Type | Transceiver |
| Form Factor | SFP |
| Data Rate | 10G |
| Connector Type | LC |
| Wavelength | 1310 nm |
| Transmission Distance | Long-Range |
| Fiber Type | Single-mode |
| Max Distance | 80 km |
| Supported Protocols | Ethernet, Fibre Channel |
| 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-861/B Optical Transceiver Module |
| Height | 1.0 inches |
| Width | 2.0 inches |
| Depth | 0.5 inches |
| Weight | 0.2 lbs |
DFE-861/B Use Case
Campus Building Fiber Extension with DFE-861/B D-Link Converter
In a multi-building university campus, the IT team deployed a pair of DFE-861/B D-Link 1-port 10/100Base-TX to 100Base-FX photoelectric converters over single-mode, single-fiber (SC) spanning 18 km (TX: 1550 nm / RX: 1310 nm). This solution seamlessly extended the Ethernet backbone between the main data center and a remote lecture hall. Benefit: Achieved reliable 100 Mbps connectivity with zero electromagnetic interference, minimized network downtime, and eliminated costly fiber-optic switch upgrades.
Remote CCTV Surveillance over 20 km Fiber Link
A city transportation authority integrated high-definition CCTV along a light-rail corridor by installing paired DFE-861/B converters at the control room and field cabinets. Using single-mode single-fiber SC links at 1550 nm/1310 nm, they maintained a 20 km run. Benefit: Delivered uninterrupted 100 Mbps video streams with hardened 1 kV isolation for EMI immunity, ensuring real-time monitoring and rapid incident response without additional repeaters.
Industrial Sensor Network in Oil & Gas Field
An offshore oil platform networked distributed sensors and PLC controllers via two DFE-861/B 100M Ethernet converters over a 15 km single-mode SC fiber link. The converters bridged the 10/100Base-TX copper segment to the 100Base-FX fiber backbone (TX: 1550 nm / RX: 1310 nm). Benefit: Enabled high-speed telemetry, immune to electrical noise and corrosive environments, resulting in precise real-time data acquisition, enhanced safety, and reduced maintenance costs.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
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|---|---|---|---|---|---|
| Compatibility | Cisco / Juniper / Huawei / Arista | Cisco, Juniper, Huawei, Arista | Cisco / Juniper / Huawei / Arista | Cisco, Juniper, Huawei, Arista | Cisco / Juniper / Huawei / Arista |
| Connector Type | LC | LC | LC | LC | LC |
| Data Rate | 10G | 10G | 10G | 10G | 100G |
| Depth | 1.2 inches | 0.5 inches | 2.35 inches | 0.9 inches | 1.30 inches |
| Fiber Type | Single-mode | Single-mode | Single-mode | Single-mode | Multi-mode |
| Form Factor | SFP+ | SFP | SFP+ | SFP | QSFP |
| Height | 0.7 inches | 1.0 inches | 0.33 inches | 0.7 inches | 0.35 inches |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Max Distance | 80 km | 80 km | 40 km | 10 km | 150 meters |
| Network Interface | Fiber | Fiber | Fiber | Fiber | Fiber |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Power Consumption | 3.5W | 3.5W | 1.5 W | 3.5W | 4.5W |
| Product Name | DGE-891/A High-Performance Long-Range 10G SFP+ Transceiver | DFE-861/B Optical Transceiver Module | DFE-855 High Performance 10G SFP+ Transceiver | DFE-851 10G SFP Transceiver | DGE-894/B QSFP 100G Short Range Transceiver |
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Supported Protocols | Ethernet | Ethernet, Fibre Channel | Ethernet | Ethernet | Ethernet |
| Transmission Distance | Long-Range | Long-Range | Long-Range | Short-Range | Short-Range |
| Wavelength | 1310 nm | 1310 nm | 1310 nm | 1310 nm | 1310 nm |
| Weight | 0.05 lbs | 0.2 lbs | 0.12 lbs | 0.1 lbs | 0.15 lbs |
| Width | 0.6 inches | 2.0 inches | 0.65 inches | 0.5 inches | 0.82 inches |
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Questions & Answers
Q
What is the D-Link DFE-861/B media converter?
A
The DFE-861/B is a 1-port 10/100Base-TX to 100Base-FX photoelectric converter featuring single-mode, single-fiber SC interface for extending Ethernet up to 20 km.
Q
How does the DFE-861/B work?
A
It converts copper Ethernet signals on the RJ-45 port to single-mode fiber signals on the SC port using 1550 nm TX and 1310 nm RX wavelengths for distances up to 20 km.
Q
What interfaces does the DFE-861/B support?
A
It supports one 10/100Base-TX RJ-45 port and one 100Base-FX SC single-mode fiber port.
Q
What type of fiber and connector does the DFE-861/B use?
A
The converter uses single-mode, single-fiber cable with an SC duplex connector for both transmit and receive.
Q
What transmission wavelengths are used by the DFE-861/B?
A
It transmits at 1550 nm and receives at 1310 nm over a single-fiber link.
Q
What is the maximum transmission distance of the DFE-861/B?
A
The DFE-861/B supports fiber spans of up to 20 km in single-mode configuration.
Q
Can I use a single DFE-861/B for two-way fiber conversion?
A
No. You need a pair of DFE-861/B units—one at each end of the fiber link—for full bidirectional communication.
Q
What Ethernet speeds and duplex modes are supported?
A
It supports 10/100 Mbps speeds with auto-negotiation for half- and full-duplex modes and auto MDI/MDIX on the RJ-45 port.
Q
Is the DFE-861/B compatible with multi-mode fiber?
A
No. This model is designed exclusively for single-mode, single-fiber applications.
Q
Does the DFE-861/B support flow control and auto-negotiation?
A
Yes. It offers IEEE 802.3x flow control, auto-MDI/MDIX, and IEEE 802.3u auto-negotiation to optimize link reliability.
Q
How do I install and connect the DFE-861/B?
A
Power each unit with the included 5 V DC adapter, plug your copper Ethernet cable into the RJ-45 port, connect the SC fiber cable, and verify link LEDs.
Q
What LED indicators are available on the DFE-861/B?
A
It features Power, TX Link/Activity, FX Link/Activity, and Full/Half-Duplex status LEDs for quick diagnostics.
Q
Can I deploy the DFE-861/B in industrial environments?
A
The DFE-861/B supports standard commercial temperature ranges; for extreme industrial conditions, consider D-Link’s industrial-grade series.
Q
What applications is the DFE-861/B ideal for?
A
It’s perfect for CCTV surveillance, campus LAN extension, enterprise networks, and any scenario requiring long-distance 100 Mbps links.
Q
Does D-Link provide a warranty for the DFE-861/B?
A
Yes. The DFE-861/B comes with a one-year limited hardware warranty and access to D-Link’s global technical support network.
