This article covers gbzj-3901.

Overview

The Startech.com USB31000S is a compact USB 3.0 to Gigabit Ethernet adapter that brings wired network connectivity to devices lacking an RJ-45 port. With support for 10/100/1000 Mbps speeds and bus-powered operation, it's a straightforward solution for laptops, ultrabooks, or desktops with a faulty onboard LAN. The adapter uses the widely-compatible Realtek RTL8153 chipset, ensuring broad OS support including Windows, macOS, and Linux. Plug-and-play installation means no manual driver setup is needed on most modern operating systems.

Connectivity & Compatibility

This adapter connects via USB 3.0 Micro-B, with an included 30cm USB 3.0 cable. It supports IEEE 802.3/802.3u/802.3ab standards for 10/100/1000 Mbps Ethernet and features auto-negotiation for speed and duplex mode. Backward compatible with USB 2.0 ports (limited to 100 Mbps). The Realtek RTL8153 controller provides strong driver support across platforms. Works with Windows 7/8/10/11, macOS 10.6 and later, and most Linux distributions with kernel-level driver inclusion. The single RJ-45 port supports Wake-on-LAN and jumbo frames up to 9K MTU.

Product Info

First released around 2015, the USB31000S remains a staple in StarTech's networking lineup. Priced around $20–$30 USD, it sits firmly in the mid-range for USB Ethernet adapters. The standard warranty is 2 years, with optional extension plans available. Package contents: adapter, USB 3.0 cable, quick-start guide. Available through major retailers like , Newegg, and directly from StarTech.com. The market positioning is reliable, no-frills connectivity for everyday users and professionals.

Best Use Cases

  • Ultrabook and thin-laptop users: Ideal for MacBook Air, Dell XPS, or Lenovo ThinkPad X1 users who need a stable wired connection for large downloads or video conferencing without Wi-Fi interference. - Desktop repair and expansion: When a motherboard's Ethernet port fails, this adapter provides an instant fix without opening the case. Also useful for adding a second LAN port for network segmentation or VM testing. - Travel backup: Its small size (6.5 x 2.5 x 1.5 cm) makes it easy to slip into a laptop sleeve – great for hotel rooms or conference centers with wired Ethernet. - Home lab and Linux users: Works seamlessly with Ubuntu/Debian for bridging or routing setups. Low power consumption (under 2W) is ideal for always-on Raspberry Pi alternatives. Be aware that performance depends on USB host controller quality; some older chipsets may drop packets under heavy load. For competitive gaming requiring ultra-low latency, a PCIe-based NIC or high-end USB adapter with hardware offloading might be preferable. Also, verify that your device's USB port delivers sufficient power – most notebook ports are fine.