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Compact black USB 2.0 to 10/100 Mbps Ethernet dongle with integrated cable

StarTech.com USB2100 USB 2.0 to 10/100 Mbps Ethernet Adapter

SKU CH-KM7J-3YMDM

Adds a 10/100 Mbps Ethernet port via USB 2.0 with a built-in cable for tight spaces

  • Product colorBlack
  • Product weight0.19 lb (0.09 kg)
  • Add a Fast Ethernet port via USB 2.0
  • Built-in cable avoids cramped connections
  • Portable USB-powered design for travel
  • Supports Wake-on-LAN and VLAN tagging
  • Weighs .19 pounds for easy portability

Add a Fast Ethernet port via USB

The USB2100 adds a 10/100 Mbps Ethernet port to a laptop or desktop through a USB 2.0 connection. Its compact dongle design includes an integrated cable that avoids cramped ports. The adapter is powered entirely by the USB bus, so no external supply is needed. It suits users who want wired networking without opening their computer case.

Capacity and headroom

The adapter supports full-duplex operation for data rates up to 200 Mbps combined. It comfortably handles typical office workloads, web browsing and standard-definition streaming over a Fast Ethernet link. Throughput will run out when the 100 Mbps port limit is reached, making it unsuitable for large file transfers or high-bitrate media that need gigabit speeds.

USB 2.0 interface limits

The USB 2.0 host interface caps the practical bandwidth well below the Ethernet port's theoretical maximum. Real-world speeds are constrained by the USB 2.0 bulk endpoint throughput, so sustained transfers rarely reach the full 100 Mbps line rate. Features such as Wake-on-LAN and VLAN tagging are supported, but jumbo frames and higher-layer offloads are not available.

How it compares

Measured against everything we stock in Network Adapters & RJ45 Plugs, at today’s prices. Recalculated every night.

Price $27.99
Pricier than about 67% of the 1,221 comparable items (median $19.99).

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Specifications

Product
Brand nameStarTech.com
Model nameUSB2100
Product colorBlack
Size & build
Product weight0.19 lb (0.09 kg)

Questions about this item

Will this USB 2.0 adapter slow down my older laptop that only has USB 1.1 ports?

The adapter uses a USB 2.0 interface and will fall back to USB 1.1 speeds if connected to an older port, limiting throughput to the port's maximum.

How can I confirm the USB2100 is operating at its rated speed after I plug it in?

Open your operating system's network adapter properties and verify the link speed is reported as 100 Mbps.

Does the StarTech.com USB2100 package include any driver media or do I need to buy a separate USB cable?

The adapter has an integrated USB cable so no separate cable is needed, and drivers are typically provided by the operating system.

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