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Twin10G SFP28 Thunderbolt Adapter
Dual-port SFP28 Gigabit Ethernet Thunderbolt Adapter
for Mac, Windows, and Linux

Add Blazing-fast Optical 10GbE Connectivity Over Thunderbolt
Are you looking for the most economical dual-port approach to connecting to a high-speed 10 Gigabit Ethernet (10GbE) fiber network using the Thunderbolt port on your Mac, Windows, or Linux computer? You’ll need the Sonnet adapter. Sonnet Twin10G™ SFP28 Thunderbolt Adapter is the powerfully simple solution for adding blazing-fast dual-port 10GbE optical network connectivity to your computer.
Twin10G SFP28 Thunderbolt Adapter is a pre-configured bundle of Sonnet Twin10G SFP28 PCIe Card with Sonnet Echo Express SEL Thunderbolt Expansion System.
Includes Two SFP28 Transceivers
Easy Network Connection
To enable easy connection to your 10GbE optical network, Twin10G SFP28 adapter includes two short-range multi-mode fibre SFP28 transceivers (up to 300 meters).
Long Range SFP28 Transceivers Available – Sonnet also offers long-range single-mode fiber modules that support 10Gb connections at up to 10 kilometers.
10x Performance
More Bandwidth
10x the Performance of Gigabit Ethernet
Each Twin10G port supports ten times the performance of Gigabit Ethernet with even more bandwidth when combining ports.
SMB Multichannel Support
Maximizes Throughput and Reliability with SMB Multichannel
Harness the full potential of Sever Message Block (SMB) Multichannel support with our Twin10G SFP28 adapter. When both ports are connected to your SMB server, you can combine their bandwidth to achieve significantly higher data transfer speeds, and more. SMB Multichannel support brings several key benefits:
Increased Throughput: By utilizing two network connections, the bandwidth of each port can be combined to deliver twice the data transfer rate.
Increased Scalability: Easily expand your network’s capabilities. As your infrastructure grows, connect the additional Twin10G port to scale throughput without complex reconfiguration.
Improved Fault Tolerance: Seamlessly keeps your computer connected in case a single cable is disconnected or one of the ports fails.
Enhanced Load Balancing: Network traffic is dynamically distributed across available connections to prevent congestion and optimize performance under varying network demands.
Reduced Latency: Minimizes delays by balancing traffic paths to enhance responsiveness in real-time operations.
Key Features

Adds High-performance 10GbE Fiber Connectivity
Simply powerful way to add dual 10GbE fibre connections to your computer with Thunderbolt ports.

SFP28 Transceivers Included
High-performance adapter includes two short range (300m) SFP28 transceivers.

Increased Throughput
By utilizing two network connections to SMB Servers, the bandwidth of each port can be combined to deliver twice the data transfer rate.

Supports Teaming on Windows and Linux
Increases throughput beyond what a single connection can sustain.

Compact. Rugged. Nearly Noiseless.
Adapter is rugged and small enough to sit on most any work surface, and quiet enough for use in noise-sensitive environments.

Thunderbolt to PCIe Device
Enough PCIe bandwidth to support two 10Gb ports at full speed.

Connect Additional Thunderbolt Devices
One port connects to computer; second port supports daisy-chaining of additional Thunderbolt peripheral devices.

Computer Compatibility
Compatible with Mac, Windows, and Linux. See Tech Specs for details.
Small. Cool. Adaptable.
Suitable for Use in Noise-sensitive Environments
Small enough to easily fit in most workspaces, Twin10G SFP28 adapter is still large enough to support proper airflow inside the case – its design enables the adapter’s temperature-controlled, variable-speed fan to keep the adapter running cool and whisper-quiet at all times, making it suitable for use in in almost any workspace. Constructed of rugged and lightweight aluminum, the adapter’s outer shell securely protects the inner circuitry.
Smart Controller
Intelligent Operation. Efficient Performance.
Twin10G SFP28 adapter attains high throughput performance with minimal host CPU load. The adapter’s smart controller has its own internal processing system with onboard memory to process TX/RX data while using few CPU resources. Once data appears in queues, TX checksums are computed on the fly as data is transmitted; RX checksums are quickly verified, and data is immediately passed directly to main memory. This independent controller action minimizes latency and avoids packet drops. The CPU is freed for other tasks.
Secure Connections for High Performance
Thunderbolt Cable and ThunderLok Included
Sonnet includes a Thunderbolt cable that supports Thunderbolt’s maximum bandwidth and is fully compatible with Thunderbolt 5, 4, and 3 computers. Sonnet also provides ThunderLok, a Thunderbolt connector cable lock, that prevents accidental cable disconnections.

ThunderLok Advantage
Many Sonnet Thunderbolt products featuring Thunderbolt ports come equipped with threaded mounting holes to securely attach a Sonnet ThunderLok connector lock, preventing Thunderbolt cables from accidentally disconnecting.
Thunderbolt Technology
Fastest External Interface Available
Sonnet Thunderbolt products feature a high-speed Thunderbolt interface that delivers PCIe bandwidth needed to support data transfers at full speed.

Connect Additional Thunderbolt Devices
One port is reserved for connecting to your computer; the second port enables connection of additional Thunderbolt peripheral devices in a daisy chain.

10 Gbps USB 3.2 Gen 2 Support
10 Gbps USB 3.2 Gen 2 support allows you to connect a USB device to the second Thunderbolt port using the proper cable or adapter.

Provides 15W of Power
For peripherals requiring extra power, 15 watts is provided to bus-powered devices through the secondary Thunderbolt port.

Supports Connecting Up to One 8K Display
Maximize the utilization of one computer Thunderbolt port, connecting the largest display supported by your computer.
| Mac Compatibility | Mac with Thunderbolt 5, Thunderbolt 4, Thunderbolt/USB4, or Thunderbolt 3 ports; macOS 15+; compatible with macOS 27. | Windows Compatibility | Windows computer with Thunderbolt 5, Thunderbolt 4, or USB4 ports; Windows 11 25H2+. |
| Linux Compatibility | Linux computer with Thunderbolt 5, Thunderbolt 4, or USB4 ports; supported Linux kernel 6.6 or later. | Part Number | TWIN10GM-SFP-TB |
| Warranty | 2 Years | Form Factor | Thunderbolt 10GbE Adapter |
| External Connectors | Two Thunderbolt ports (second port supports a Thunderbolt peripheral, USB device, or display); two SFP28 sockets with two short-range SFP28 optical transceivers; 12V power port. | 10GbE Controller | Mellanox ConnectX |
| Network Support | 10 Gbps | Data Rates Supported per Port | 10 Gbps |
| macOS SMB Multichannel Support | SMB Multichannel can double transfer speeds up to 20 Gbps. | Windows & Linux Teaming / SMB Multichannel | Windows 11 and 10, Windows Server, and Linux; Teaming or SMB Multichannel can double transfer speeds up to 20 Gbps. |
| Maximum Packet Size | 9000 bytes (Jumbo Frames) | Advanced Features | Flow control support; MSI (Message Signaled Interrupts); RSS (Receive-Side Scaling); multicast filtering; 64-bit address support for systems using more than 4GB of physical memory; Wake-on-LAN not supported. |
| Stateless Offloads | TCP, UDP, and IPv4 checksum offloading; TRO (TCP Receive Offload). | Power Adapter | Universal 60W, 100-240V, 50-60 Hz; NRTL Certified. View NRTL Certification PDF |
| Operating Temperature | 0°C to 35°C (32°F to 95°F) | Dimensions (W x D x H) | 4 x 8.25 x 2.75 in. (10.3 x 21 x 7.3 cm) |
| Weight | Thunderbolt Adapter and Power Adapter: 2.3 lbs (1.04 kg); Complete Package: 4.1 lbs (1.86 kg). | Package Contents | Twin10G SFP28 Thunderbolt Adapter; two short-range SFP28 optical transceivers (installed); universal power adapter; region-specific power cable; 0.8-meter Thunderbolt cable; ThunderLok-A connector lock; documentation. |
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