Addressing pain points such as the lack of PCIe slots in laptops, NUC mini PCs, mobile workstations, and industrial equipment—which prevents the expansion of 10 Gigabit SFP+ ports—as well as the need for both single- and dual-link solutions and inconsistent system compatibility, LeKuo has introduced two USB4-to-10Gb SFP+ fiber network adapter solutions: the DTB3F11 (single-port) and the DTB3F22 (dual-port). Both products are equipped with the Realtek RTL8127ATF 10Gb network chip, enabling high-speed 10Gb fiber network expansion for devices via the USB4 interface.
Analysis of the Core Architecture: Same RTL8127ATF Platform, Different Design Targets
Both products are equipped with the Realtek RTL8127ATF dedicated Ethernet chip, which is optimized for SFP+ 10 Gigabit optical ports. It supports 10 Gbps line-rate forwarding at the hardware level, with a power consumption of just 2.5W. The chip delivers low latency, low CPU utilization, and high stability, and has been tested to achieve internal network transfer speeds of approximately 1.15 GB/s.
Differentiated single-port and dual-port designs for precise adaptation to various scenarios
1. Optical port configuration: Single-port portable vs. dual-port multi-link
DTB3F11: Single USB4 40Gbps upstream port (compatible with Thunderbolt 3/4/5) + 1 SFP+ 10GbE port, bus-powered, ultra-portable
DTB3F22: Dual USB4 40Gbps ports (1 upstream + 1 downstream) + 2 SFP+ 10 Gigabit Ethernet ports, external power supply, supports USB4/Thunderbolt device expansion
|
Features |
DTB3F11 |
DTB3F22 |
|
Number of fiber ports |
1 SFP+ 10 Gigabit Ethernet port |
2 independent SFP+ 10 Gigabit Ethernet ports |
|
Supported speeds |
10GBASE-R/1000BASE-X auto-negotiation |
10GBASE-R/1000BASE-X auto-negotiation |
|
Core Strengths |
Single-port, high value for money, meets basic 10 Gigabit requirements |
Dual links operate independently, supporting link aggregation and separation of internal and external networks, as well as expansion via USB4/Thunderbolt devices, |
2. Interfaces and Cascading: Pure Network Expansion vs. Network + Peripherals Combo
●DTB3F11: Retains only the essential USB4 upstream port and focuses on 10 Gigabit Ethernet expansion, making it ideal for laptops with extremely limited ports.
●DTB3F22: Equipped with a USB4 downstream port, it supports USB4/Thunderbolt device expansion: You can daisy-chain Thunderbolt displays, docking stations, external hard drives, and other peripherals to achieve a “10 Gigabit Ethernet + peripheral expansion” two-in-one solution, completely resolving the issue of insufficient Thunderbolt ports.
3. Power Supply and Power Consumption: Bus-Powered Portability vs. External Stability
|
Features |
DTB3F11 |
DTB3F22 |
| Power Supply |
USB4 Power Delivery |
12V/3A External Power Adapter |
| Typical Power Consumption |
Total power consumption is approximately 3.9 W |
Total power consumption is approximately 7.4 W |
| Key Advantages |
No external power source required; plug-and-play; highly portable |
Power supply is sufficient, and both optical ports operate stably under full load simultaneously. |
4. System Compatibility:
DTB3F11 and DTB3F22: Compatible with Windows 10/11 and Linux; currently not compatible with macOS.
5. Enterprise-Grade Features: Comprehensive Support Across All Models
Both products offer a full suite of enterprise-grade networking features:
● Support for 16KB jumbo frames, significantly reducing protocol overhead
● Support for IEEE 802.1Q VLAN and 802.1ad Q-in-Q dual VLAN
● Support for Wake-on-LAN remote wake-up and PXE+EFI dual-mode network booting
● Supports full-duplex flow control (IEEE 802.3x) for lossless data transmission
Real-world Scenarios: Choose Based on Needs to Precisely Address 10GbE Upgrade Challenges
Scenario 1: 10GbE Upgrade for Personal Laptops/Mobile Office
Requirements: For business travel and home use, requires a portable 10 Gigabit Ethernet connection without the need for an external power source
Recommended Product: DTB3F11
Solution Benefits: Bus-powered, no external power required; compact and portable; simply plug into a Thunderbolt port to use
Performance: Direct 10GbE fiber connection between laptop and NAS; large file backup speeds 10 times faster than Gigabit; smooth, lag-free online preview of 4K footage
Scenario 2: Multi-device connectivity in a content creation studio
Requirements: Simultaneous connection to a NAS media library and the office network; requires external peripherals such as monitors and hard drives
Recommended Product: DTB3F22
Solution Benefits: Dual optical ports connect the NAS and switch, respectively; the Thunderbolt downstream port daisy-chains the monitor and docking station, resulting in a clean and efficient workspace
Performance: Real-time preview of multi-track 4K footage and lag-free rendering output; simultaneous connection of peripherals and network devices without frequent plugging and unplugging
Scenario 3: High-Speed NAS Interconnection and Link Aggregation
Requirements: Increase NAS transfer speeds, enable concurrent multi-user access without bottlenecks, and support link redundancy
Recommended Product: DTB3F22
Solution Benefits: Dual fiber ports support link aggregation, increasing total bandwidth to 20 Gbps without occupying the NAS’s native ports
Actual Performance: Multi-user simultaneous access to the NAS and large file sharing speeds are doubled; a single link failure does not affect network connectivity
Scenario 4: Industrial Edge Computing Node
Requirements: A stable 10 Gigabit network connection is required in industrial environments, with wide-temperature operation and support for multi-link redundancy.
Recommended Product: DTB3F22
Solution Benefits: All-metal passive cooling, wide-temperature operation from 0°C to 85°C, and dual optical ports for link redundancy.
Actual Performance: High-speed data backhaul from edge nodes, with the device operating stably 24/7.
Key Specifications Comparison Chart: A Visual Guide to the Differences Between the Two Products
|
Performance Specifications |
DTB3F11 |
DTB3F22 |
|
Number of optical ports |
1 SFP+ 10 Gigabit Ethernet port |
2 SFP+ 10 Gigabit Ethernet ports |
|
USB4 port |
1 (Uplink only) |
2 (1 upstream + 1 downstream in cascade) |
|
Power Supply Method |
USB4 Power Delivery |
12V/3A external power supply |
|
Typical power consumption |
Total power consumption is approximately 3.9 W |
Total power consumption is approximately 7.4 W |
|
System Support |
Windows10/11、Linux4 |
Windows10/11、Linux |
|
Lightning Cascade |
Not supported |
Support |
|
Core Positioning |
Personal, portable, single-link 10 Gigabit |
Professional studio, dual-link aggregation, peripheral expansion |
Summary
The LeKuo DTB3F11 and DTB3F22 USB4-to-10Gb SFP+ fiber network adapters are both based on the same high-performance RTL8127ATF chip. Through differentiated interface designs, power supply solutions, and system compatibility, they precisely address the 10Gb fiber network upgrade needs of different users:
● For portability and single-link requirements: The DTB3F11 is the top choice, featuring ultra-low power consumption of 2.5W and bus-powered operation for plug-and-play functionality
● For dual-port link aggregation, USB4/Thunderbolt device expansion, and industrial-grade wide-temperature operation: The DTB3F22 is the top choice, featuring dual Ethernet ports and daisy-chain functionality for full compatibility with professional scenarios
No need to open the case or use a PCIe slot—simply plug it into a Thunderbolt port to enjoy the high speed and stability of a 10 Gigabit fiber network. This is the optimal solution for 10 Gigabit upgrades on devices without PCIe slots.