• Overview
  • Tech Specs

10GbE & Thunderbolt Logos
Lightning Fast 10GbE Over Thunderbolt

Do you need an uncomplicated way to connect a Thunderbolt technology-enabled Mac to a high speed 10 Gigabit Ethernet (10GbE) network? With increasing demands for greater data transfer speeds and more bandwidth over shared networks, and with specialized applications as HD video editing using high-performance shared storage systems, 10 Gigabit Ethernet (10GbE) use has skyrocketed. This high-speed wired networking standard offers ten times the performance of Gigabit Ethernet, the common wired network connection included with most computers today. Sonnet's Echo Express SEL 10GbE Thunderbolt 2-to-10GbE adapter provides you a powerfully simple way to add lightning fast 10 Gigabit Ethernet network connectivity to any desktop or notebook Mac with Thunderbolt 2 or Thunderbolt ports.

Small. Light. Quiet.

Measuring a scant 4 inches wide by 8.25 inches long by 2.75 inches tall, the Echo Express SEL 10GbE bundles Sonnet's Echo Express SEL Thunderbolt 2 Expansion Chassis with a Presto™ 10GbE PCIe card and a 1-port Fibre SFP+ transceiver, providing you a near plug-and-play solution for adding 10GbE connectivity. A temperature-controlled, variable-speed fan keeps the adapter running cool and whisper-quiet. In addition, Thunderbolt 2 ports on the back panel of the chassis support daisy chaining of up to six devices to a single port on the host computer.


Smart Networking. Echo Express SEL 10GbE bundles a Sonnet Echo Express SEL chassis with a Presto 10Gbe PCIe card and a 1-port Fibre SFP+ transceiver.

This adapter enables you to connect your computer to high-speed infrastructure and storage without stepping down in speed. Setup is simple—connect the Echo Express SEL 10GbE to the host computer via the included Thunderbolt cable and to the switch or 10GbE port via fiber optic cable (sold separately), plug in the included power supply, and then configure the setup through the OS X® Network control panel.

Bandwidth & CPU UsageThis Sonnet solution is perfect for high-performance computing where low latency, high bandwidth, and low CPU overhead are required. Its increased throughput performance and low host-CPU utilization are achieved with stateless offloads, allowing your computer to perform better while large files transfers or high I/O operations take place.

Key Features

Provides 10GbE Connectivity to Mac with Thunderbolt Technology—Powerfully simple way to add high-performance 10GbE connectivity to your Thunderbolt 2 or Thunderbolt-enabled computer

Thunderbolt 2 Interface—Maximum performance with computers with Thunderbolt 2 technology, backward compatible with host computers and other devices equipped with 10Gbps Thunderbolt technology

Upgradeable—When available, upgrade to 40Gbps Thunderbolt 3 Technology with a replacement Thunderbolt interface card

Small and Light—Compact Thunderbolt 2-to-10GbE adapter integrates Sonnet's streamlined Echo Express SEL chassis and a Presto 10Gbe PCIe card with a 1-port Fibre SFP+ transceiver

Easy Setup—Configured through OS X Network control panel

Two Thunderbolt 2 Ports—Daisy chain up to six devices to a single port on the host computer

Remarkably Quiet—Temperature-controlled, variable-speed fan automatically and quietly cools the card

Energy Saver Mode—Powers on/off automatically with the computer

Rugged Aluminum Housing—Provides robust and secure protection for any environment


Echo Express SE 10GbE Connected to Macs

Put Your Mac's Thunderbolt Port to Good Use. Sonnet's Echo Express SEL 10GbE adapter connects to any Mac with a Thunderbolt 2 or Thunderbolt port to provide a seamless and quick interface to connecting to high-speed 10 Gigabit Ethernet networks.

10x the Performance of Gigabit Ethernet

Thunderbolt Cable & ThunderLokThunderbolt Cable and ThunderLok™ Included

Sonnet includes a Thunderbolt cable to connect the Echo Express III-D to your computer, and a ThunderLok Thunderbolt connector retainer clip(3) to secure the cable to the Echo chassis. Thunderbolt connectors are held in place by friction, which works well in situations where equipment remains undisturbed while operating. But when there’s a chance of movement nearby, there’s a chance the Thunderbolt cable can be unintentionally unplugged, possibly leading to loss of your work or data. Sonnet’s ThunderLok prevents accidental cable disconnections from the Echo chassis, and is easy to install and use—just slide it over one end of the cable, and then plug in the connector and secure it to the chassis by turning a thumbscrew. Because of its unique design, ThunderLok does not attach to the connector, but remains on the cable so it won’t get lost when not in use.

Echo Express SE 10GbE Connected to iMac

 Computer hardware shown in photos for illustration purposes; items sold separately. See package contents for items included with adapter.
See Tech Specs Tab for footnotes
Part No.  
ECHO-EXP-SL10G Echo Express SEL 10GbE 10 Gigabit Ethernet Thunderbolt 2 Adapter
Warranty 2-year
Form Factor Thunderbolt adapter
External Connectors
  • Two Thunderbolt 2 ports
  • LC Fibre
  • 12V power
Transceiver Type SR SFP+ (850 nm wave length)
Cable Distance
  • 0M2 cable - 82m
  • 0M3 cable - 300m
  • 0M4 cable - 400m
Network 10 Gigabit Ethernet 10GBASE-SR
Packets Maximum packet size: 9000 bytes (jumbo packets)
  • ~9.9 Gb/s with 9KB MTU, ~ 9.5 Gb/s with 1500B MTU
  • 1170MB/sec(2) with Thunderbolt 2
  • 800 MB/sec with Thunderbolt
Stateless Offloads
  • IP and TCP checksum offload, send and receive
  • TSO (TCP Segmentation Offload, AKA Large Send Offload)
  • LRO (Large Receive Offload)
  • RSS (Receive-Side Scaling)
  • Interrupt Coalescing
  • Multicast filtering
Power Adapter Universal 60W, 100-240V, 50-60 Hz
Operating Temperature

0º C to 35º C (32º F to 95º F)

Dimensions (WxDxH) 4. x 8.25 x 2.75 in. (10.3 x 21 x 7.28 cm)
Weight (including power adapter)  

2.95 lbs. (1.34 kg)

RoHS Compliant Yes
Package Contents
  • Echo Express SEL 10GbE 10 Gigabit Ethernet Thunderbolt Adapter
  • 0.5m Thunderbolt cable
  • ThunderLok Thunderbolt Retainer Clip(1)
  • Universal power adapter
  • Power cord
  • Documentation


Specifications subject to change without notice.






Mac Compatibility

Mac with a Thunderbolt or Thunderbolt 2 port

OS X 10.8.5+

OS X El Capitan compatible

PC Compatibility

PC with a Thunderbolt or Thunderbolt 2 port

Windows® 10, 8, 7

Technical Notes

  1. ThunderLok compatible with all copper Thunderbolt cables. Not yet compatible with optical Thunderbolt cables.
  2. Jperf Benchmark.

Mac Logo PCI Express LogoroHS Logo