StarTech USB31000SPTW USB 3.0 to Gigabit Ethernet Adapter with USB Pass-Through

Overview

The StarTech USB31000SPTW solves a specific problem that comes up constantly in field deployments and office setups alike: your laptop has one USB-A port to spare, but you need both a wired Gigabit Ethernet connection and an additional USB 3.0 device connected simultaneously. This compact adapter — measuring just 5.0 in x 1.4 in x 0.7 in and weighing 1.6 oz — splits that single USB-A port into an RJ-45 Gigabit Ethernet jack and a USB 3.0 Type-A pass-through port, with no external power brick required. The attached 6.1-inch cable keeps the adapter tethered without strain on the host port, and the white finish fits cleanly in professional and enterprise environments. For integrators, IT staff, or field techs connecting a laptop to a managed network switch or NVR for configuration work, this is a practical, no-overhead tool.

Key Features

• Gigabit Ethernet (10/100/1000 Mbps): Full 1000BASE-T throughput over standard Cat5e/Cat6 up to 100m — meaning you can pull a config session, firmware update, or file transfer at real wired speeds rather than throttling through Wi-Fi. Particularly useful when connecting to an NVR or managed switch during commissioning where a stable, low-latency link matters.
• USB 3.0 Pass-Through at 5 Gbps: The pass-through port runs at USB 3.0 SuperSpeed (5 Gbps), so connecting an external SSD, USB key, or peripheral doesn't cost you bandwidth. You're not sharing a degraded 2.0 connection — the 5 Gbps ceiling is maintained for data transfer tasks running in parallel with the network link.
• Ethernet Max Aggregate Rate of 2 Gbps: The adapter supports an aggregate Ethernet throughput ceiling of 2 Gbps, which matters if you're running bidirectional traffic simultaneously — upload and download don't compete for the same 1 Gbps slice.
• Bus-Powered Operation: Draws power directly from the host USB port — no wall adapter, no separate cable to manage. This keeps the deployment footprint minimal, particularly relevant for field technicians working from a laptop bag or a tight rack-side workspace.
• Jumbo Frame Support (4K Max): Supports jumbo frames up to 4K bytes, which reduces CPU overhead on large data transfers by packing more payload per frame. Useful when moving large video files or configuration backups across the wired link.
• IEEE Standards Compliance (802.3i / 802.3u / 802.3ab / 802.3az): Full compliance with IEEE 802.3ab (Gigabit over copper) ensures compatibility with virtually any managed or unmanaged Gigabit switch. 802.3az (Energy Efficient Ethernet) reduces power draw during low-activity periods — a minor but real factor for battery-powered laptops in the field.
• Dual-Chipset Architecture (ASIx AX88179A + VIA/VLI VL817): Separate silicon handles Ethernet and USB hub functions — the AX88179A is a well-supported Gigabit Ethernet controller with broad OS driver coverage, and the VL817 manages USB 3.0 hub switching. This isn't a single-chip compromise; each function gets dedicated silicon.
• Operating Temperature 0°C to 50°C: Rated for standard indoor commercial environments. Not designed for uncontrolled outdoor or industrial settings — keep it inside the laptop bag or on the desk, not zip-tied to an outdoor enclosure.
• Compact Attached-Cable Form Factor: The 6.1-inch attached cable means no dongle dangling directly off the laptop port — reduces mechanical stress on the USB-A connector and gives a bit of slack for routing around a laptop stand or riser.

Integration and Compatibility

The USB31000SPTW connects via USB Type-A and exposes an RJ-45 port alongside a USB 3.0 Type-A pass-through. The AX88179A chipset has broad driver support across major operating systems, making this a practical choice for IT staff and integrators who carry a single adapter across heterogeneous laptop fleets without worrying about OS-specific driver packages. The 100m Ethernet reach is standard Cat5e/Cat6 range — pair this with a Gigabit network switch for full-speed wired connectivity in any temporary or permanent workstation setup. For security integrators, this adapter is useful during NVR commissioning, switch configuration, or camera firmware updates where a stable wired connection to the management port is required but the laptop has no built-in RJ-45. The USB pass-through allows a USB key with firmware files or a configuration backup drive to remain connected simultaneously — no need to unplug the Ethernet adapter to swap in a USB device.

Frequently Asked Questions

Q: Does the USB31000SPTW require an external power supply?

A: No. The USB31000SPTW is fully bus-powered — it draws all operating power from the host USB-A port. No external power adapter or wall outlet is needed.

Q: What is the maximum Ethernet speed supported?

A: The USB31000SPTW supports 10/100/1000 Mbps (Gigabit Ethernet) with a maximum aggregate Ethernet rate of 2 Gbps for bidirectional traffic. Standard wired reach is 100 meters over Cat5e or Cat6 cabling.

Q: Can I use the USB pass-through port and Ethernet simultaneously?

A: Yes. The pass-through USB 3.0 port operates independently at up to 5 Gbps, so you can transfer data to a connected USB device while the Gigabit Ethernet link is active — the two functions do not share bandwidth in a way that degrades either.

Q: Does the USB31000SPTW support jumbo frames?

A: Yes, with a maximum jumbo frame size of 4K bytes. This reduces CPU overhead on large file transfers by fitting more payload into each Ethernet frame.

Q: What is the warranty on the USB31000SPTW?

A: The USB31000SPTW carries a 2-year manufacturer warranty.

Q: What are the operating temperature limits?

A: The USB31000SPTW is rated for operating temperatures of 0°C to 50°C and storage temperatures of -20°C to 60°C, with humidity tolerance of 5–85% RH non-condensing. It is designed for standard indoor commercial environments.

Ted Perry

The USB31000SPTW is one of those tools that earns its place in a field kit not because it's flashy, but because it solves a real constraint precisely. The dual-chipset design — AX88179A for Gigabit Ethernet and VL817 for USB 3.0 hub switching — means each function gets dedicated silicon rather than a single-chip compromise. That matters when you're pulling a simultaneous Ethernet config session and reading from a USB drive; you're not fighting for shared resources.

Technical Highlights:

• 5 Gbps USB 3.0 Pass-Through: Full SuperSpeed throughput on the pass-through port means connecting an external SSD for firmware staging or config backup doesn't throttle to USB 2.0 speeds — 5 Gbps ceiling maintained independently of the Ethernet link.
• 2 Gbps Aggregate Ethernet: The 1000 Mbps Gigabit link carries a 2 Gbps aggregate ceiling for bidirectional traffic, so upload and download don't compete for the same 1 Gbps slice during large simultaneous transfers.
• IEEE 802.3az (Energy Efficient Ethernet): During low-activity periods the adapter reduces power draw automatically — a real consideration when running bus-powered off a laptop battery during extended field sessions without AC access.

Deployment Considerations:

• The 6.1-inch attached cable provides enough slack to route cleanly to a laptop stand or riser without straining the host USB-A port — useful when the adapter will stay connected for extended commissioning sessions rather than being plugged and unplugged repeatedly.
• Operating range tops out at 50°C — keep this in mind for any deployment inside a warm server closet or IDF with poor ventilation. It's not rated for industrial or outdoor uncontrolled environments.

The USB31000SPTW is the right pick for a security integrator or IT field tech who needs a stable wired Gigabit link to an NVR management port or managed switch during commissioning, while keeping a USB drive connected for firmware files — all from a single laptop USB-A port without carrying a powered hub.