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Difficulty: Very hardDisplay Cables and Connectors

A deployment technician is setting up dual-monitor workstations using laptops provided to remote staff. The laptops feature USB Type-C ports that support DisplayPort Alternate Mode (DP Alt Mode), but they do not possess dedicated Thunderbolt host controllers. The technician needs to connect each laptop via a single USB Type-C cable to a docking station that drives two extended external monitors. Which TWO of the following statements accurately specify the cabling and display protocol requirements for this configuration?

  1. The USB Type-C cable connecting the dock must be rated for video data transport, as charging-only USB-C cables lack the high-speed physical lanes required for DP Alt Mode.Answer
  2. B
    A Thunderbolt 3 or Thunderbolt 4 active cable must be mandated, as standard USB Type-C ports cannot carry native DisplayPort signals without Thunderbolt protocol encapsulation.
  3. The host system GPU and USB Type-C port must support DisplayPort Multi-Stream Transport (MST) to route two distinct display signals across the single USB Type-C connection.Answer
  4. D
    Passive VGA-to-USB-C adapter dongles must be attached to the monitor endpoints to double the available clock frequency and overcome USB-C bandwidth limitations.

Answer

To route dual independent display signals over a single USB Type-C connection without Thunderbolt hardware, the deployment requires a full-featured USB Type-C cable supporting video data pass-through (DP Alt Mode) and host support for DisplayPort Multi-Stream Transport (MST).
DisplayPort Alternate Mode utilizes the high-speed physical lanes inside a full-featured USB Type-C cable to transport native DisplayPort video signals directly, making video-rated cabling essential. Additionally, driving multiple extended displays over that single USB Type-C connection requires DisplayPort Multi-Stream Transport (MST) support in the GPU and port controller to break the single video connection into independent monitor streams.

Step-by-Step Solution

1
Analyze physical cable requirements for USB Type-C video transport.
Identified that USB Type-C cables intended for video transport must contain the SuperSpeed high-speed physical lanes needed to carry native DisplayPort signals via DP Alt Mode.
Power-only or USB 2.0-only Type-C cables omit the internal wires necessary for video signals.
2
Evaluate host controller and protocol compatibility.
Determined that DP Alt Mode carries native DisplayPort signals directly over USB-C without requiring Thunderbolt host hardware or Thunderbolt protocol encapsulation.
Thunderbolt is a separate high-speed protocol; DP Alt Mode is a native DisplayPort feature integrated into the USB Type-C standard.
3
Identify multi-display routing mechanism across a single physical link.
Confirmed that DisplayPort Multi-Stream Transport (MST) is required to split a single video pipeline into multiple extended desktop outputs.
Without MST support on the host GPU/port, a single DisplayPort link can only mirror displays rather than extend them independently.

Key Concept

DisplayPort Alternate Mode (DP Alt Mode) and Multi-Stream Transport (MST) over USB Type-C
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Topics

Display Cables and Connectors

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