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The Mystery of the 100 Mbps Internet Speed

September 24, 2021 #random #networking

My current workstation setup includes a ThinkVision P27h-20 Flat Panel Monitor which offers a “full-functioned USB Type-C one cable solution with the capability to deliver up to 90W power delivery and an Ethernet signal.” There are a lot of devices on my Wi-Fi, so I often choose to “hard-wire” with a Cat6 cable.

During some recent network issues, I decide to visit fast.com to check my internet speed. My current plan is rated at 300 Mbps downstream and I often get faster speeds reported. I was surprised to see the result below of exactly 100 Mbps.

Your internet speed is 100 Mbps

The LED light on the corresponding router port indicated a Gigabit Ethernet (GbE) connection - not the slower Fast Ethernet (FE) which would match that 100 Mbit/s rate. My best guess (after some internet searches) is that integrated USB 2.1 Hub with its “Up to 480 Mb/s” speed is the limiting factor.

USB 10/100/1000 LAN

How did this hardware get designed with a USB C 3.1 interface on one side, a USB 10/100/1000 LAN on the other, but put a limiting USB 2.1 Hub in the middle? Needless to say, I switched to a wireless connection.


Kevin Hakanson

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