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

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

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

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.