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Compact black USB 3.0 adapter with RJ45 port and LED indicators

STARTECH

STARTECH USB31000S USB 3.0 Gigabit network card

SKU CH-NN0W-ZN7KF MPN USB31000S

Adds a Gigabit RJ45 Ethernet port over USB 3.0 with VLAN tagging, Jumbo Frames and checksum offload

  • Rated speed10/100/1000 Mbit/s
  • Interface typeUSB 3.0
  • Supported standardsIEEE802.3i, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3az, IEEE 80
  • Connection types1 x RJ45
  • Indicator lightsActivity (Yellow) Link (Green)
  • Temperature rangeOperating Temperature: 0 °C to 40 °C (32 °F to 104 °F) Stora

Color Black

  • Gigabit speeds over USB 3.0 for full bandwidth performance
  • VLAN tagging support enables network segmentation and traffic management
  • Jumbo Frames and checksum offload reduce CPU overhead during transfers
  • Auto MDIX corrects cable crossover automatically for hassle-free setup
  • Powered directly from the USB port with no external adapter needed

Portable Gigabit Ethernet adapter

The USB31000S adds a single RJ45 port to any USB-enabled computer, delivering full Gigabit bandwidth over a USB 3.0 connection. It is backward compatible with USB 2.0 and 1.x hosts, though speed will be limited by the slower bus. The adapter draws power directly from the USB port and includes Auto-MDIX crossover detection for simple cable installation. Home and business users gain a compact, portable network upgrade without opening the chassis.

Sustained throughput on USB 3.0

Under continuous load the adapter maintains Gigabit line rate because the USB 3.0 interface provides sufficient bandwidth, unlike USB 2.0 alternatives that saturate well below 1000 Mbps. Checksum offload for IPv4, IPv6, TCP and UDP reduces host CPU utilisation during prolonged transfers, while Large Send Offload further eases processing overhead. Jumbo Frame support allows larger Ethernet frames to improve efficiency on compatible networks. Operating temperature range spans 0°C to 40°C for reliable operation in typical indoor environments.

USB 3.0 host requirement for full speed

The single specification that determines suitability is the host interface: a USB 3.0 port is required to achieve the advertised 10/100/1000 Mbps performance. On USB 2.0 or 1.x ports the adapter functions but throughput drops to the bus limit, making it unsuitable for users who need true Gigabit rates on legacy connections. Buyers without an available USB 3.0 port should consider this constraint before purchase.

How it compares

Measured against everything we stock in Ethernet Cards & NICs, at today’s prices. Recalculated every night.

Price $27.99
Cheaper than about 86% of the 1,505 comparable items (median $90.99).

Specifications

Product
Brand nameStarTech.com
Model nameUSB31000S
Performance
Rated speed10/100/1000 Mbit/s
Connectivity
Supported standardsIEEE802.3i, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3az, IEEE 802.1q VLAN tagging
Ports & slots
Interface typeUSB 3.0
Connection types1 x RJ45
Size & build
Product dimensions5.3 in × 2.6 in × 1 in
Product weight0.31 lb (0.14 kg)
Shipping weight0.13 kg
Package size165 × 132 × 43 mm
In the box
In the boxUSB 3.0 to Gigabit Ethernet NIC Network Adapter
1 x Driver CD
1 x Instruction Manual
Environment & compliance
Temperature rangeOperating Temperature: 0 °C to 40 °C (32 °F to 104 °F)
Storage Temperature: -20 °C to 60 °C (-4 °F to 140 °F)
Humidity range< 80% RH
More details
Indicator lightsActivity (Yellow)
Link (Green)

Other versions of this model

1 more in the same range

Questions about this item

Does the USB31000S run hot or draw extra power when left plugged in all day?

It is powered directly from the USB 3.0 port with no external supply needed. Operating temperature range is 0°C to 40°C, so it stays within normal limits during continuous use.

What must my computer already have for this adapter to work?

A free USB 3.0 Type-A port and an operating system supported by the included driver CD. The adapter is backward compatible with USB 2.0 ports, though speed will be limited by the slower bus.

Will the USB31000S negotiate correctly with my older 100 Mbps switch?

Yes. It supports 10/100/1000 Mbps speeds and includes Auto MDIX crossover detection, so it will automatically configure the link with legacy 10BASE-T or 100BASE-TX equipment.

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