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Zorluk: OrtaDisplay Cables and Connectors

An IT technician is setting up a dual-monitor workstation for a video editor using a laptop equipped with a USB-C port marked with a lightning bolt symbol. The technician connects the laptop to a dual-monitor docking station using a standard USB 3.2 Gen 2 Type-C cable (10 Gbps). Although both 4K monitors are detected, only one monitor displays at 4K resolution at 60 Hz, while the second monitor is capped at a lower 1080p resolution. Which of the following is the most likely cause of this limitation?

  1. The standard USB 3.2 Type-C cable lacks the 40 Gbps bandwidth required for dual 4K@60Hz video streams, requiring a dedicated Thunderbolt cable.Cevap
  2. B
    USB-C ports marked with a lightning bolt symbol only support single-display video output unless an active VGA adapter is attached.
  3. C
    The docking station requires a passive DVI-D dual-link cable to split the DisplayPort video signal into dual 4K channels.
  4. D
    The laptop motherboard BIOS must be configured to switch the USB-C port from digital video mode to analog DisplayPort mode.

Cevap

The standard USB 3.2 Type-C cable lacks the 40 Gbps bandwidth required for dual 4K@60Hz video streams, requiring a dedicated Thunderbolt cable.
The correct answer identifies that while the laptop port supports Thunderbolt 3/4 (indicated by the lightning bolt icon), the cable used is only a standard USB 3.2 Gen 2 Type-C cable rated for 10 Gbps. Dual 4K displays at 60 Hz exceed 10 Gbps bandwidth, so the dock falls back to reduced resolution on the second screen. Replacing the cable with a certified 40 Gbps Thunderbolt cable restores full bandwidth for both 4K monitors.

Adım Adım Çözüm

1
Identify the port capability and cable type used in the scenario.
The laptop features a Thunderbolt 3/4 port (identified by the lightning bolt icon), but it was connected using a standard USB 3.2 Gen 2 Type-C cable (10 Gbps).
Physical USB-C cables vary significantly in bandwidth capacity depending on whether they are standard USB data cables or certified Thunderbolt cables.
2
Evaluate the bandwidth required for dual 4K displays at 60 Hz.
Driving dual 4K monitors at 60 Hz requires approximately 25-32 Gbps of total uncompressed video bandwidth.
A standard USB 3.2 Gen 2 cable maxes out at 10 Gbps throughput in DisplayPort Alt Mode, forcing the dock and GPU to lower the resolution on the second display.
3
Determine the corrective action to achieve full resolution on both displays.
Replace the USB 3.2 Type-C cable with a certified 40 Gbps Thunderbolt cable.
A Thunderbolt cable enables the full 40 Gbps throughput of the Thunderbolt controller, providing sufficient bandwidth for dual 4K@60Hz display output.

Anahtar Kavram

Thunderbolt vs. USB-C Cable Bandwidth for Multi-Monitor Display Output
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Konular

Display Cables and Connectors

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