Monitor USB-B Uplink: Why the Hub Does Not Work
Quick answer / TL;DR: Short answer: connect a USB-A to USB-B cable from the computer to the monitor's upstream port to activate the monitor's USB hub. Use USB 3.0 rated cable and ports for 5 Gbps; USB 2.0 works but caps the hub. The cable does not carry video, and the video connection is separate.
A patch cord is a stranded assembly: moulded boot, eight contacts, T568B.Many monitors include a USB hub. That hub only works when the monitor's upstream USB-B port is connected to the computer.
Without that cable the downstream ports have no host, which is why they appear dead.
Ports on a Monitor
| Port | Function | Cable |
|---|
| HDMI or DP | Video | Video cable |
| USB-B upstream | Connects hub to PC | A to B cable |
| USB-A downstream | Peripherals | Device cables |
| USB-C | Video plus data | Single cable on newer models |
On newer monitors with USB-C, the single cable carries video, data and power, and the USB-B port may not exist at all.
Practical Points
- Match USB 3.0 ports for full hub speed
- The upstream cable is often missing second-hand
- Long upstream cables can drop the hub
- Check the monitor menu for USB power settings
- Do not confuse with a printer cable, though the connector is the same
The last point causes confusion: the cable is physically identical to a printer cable and electrically interchangeable.
Real-World Applications
A monitor with four USB ports used for a keyboard, mouse and webcam needs the uplink cable to a desktop, and then the desk has one cable to the PC instead of four. A laptop user with a USB-C monitor needs no uplink cable at all.
Standards and Verification
| Reference | Relevance |
|---|
| USB 2.0 and 3.2 | Data rates |
| USB-IF | Connector compliance |
| VESA | Monitor mounting and ports |
Hub behaviour for a specific monitor is not provided in the knowledge base. Check the manual for the upstream port requirement.
Practical Notes
Label the uplink cable at both ends. It is the one cable whose absence makes four ports look broken.
Related reading: usb cable — blogs/news/usb-cable
Related reading: usb c to usb c cable — blogs/news/usb-c-to-usb-c-cable
Related reading: usb c to usb a cable — blogs/news/usb-c-to-usb-a-cable
Frequently Asked Questions
Why are the monitor USB ports dead?
The USB-B uplink cable is missing.
Is it the same as a printer cable?
Physically yes, and interchangeable.
Does it carry video?
No. Video is a separate connection.
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