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Zorluk: OrtaDisplay Cables and Connectors

A technician is setting up a laptop at a workstation equipped with a dual-monitor USB Type-C docking station. When the technician connects the laptop to the dock using a spare USB Type-C charging cable found in an office drawer, the laptop indicates it is receiving power, but neither of the external displays detects a video signal. Connecting the dock with the manufacturer's original cable immediately resolves the issue. Which of the following best explains why the spare USB Type-C cable failed to transmit video?

  1. The spare cable lacks the necessary internal high-speed wiring to support DisplayPort Alternate Mode data transmission.Cevap
  2. B
    All USB Type-C cables require an inline active converter chip to transform digital USB data packets into native monitor display signals.
  3. C
    The USB Type-C interface only carries legacy analog VGA signals and requires an external digital-to-analog adapter for modern monitors.
  4. D
    Standard USB Type-C ports are incompatible with multi-monitor docks unless a dedicated Thunderbolt expansion card is installed.

Cevap

The spare cable lacks the necessary internal high-speed wiring to support DisplayPort Alternate Mode data transmission.
USB Type-C uses DisplayPort Alternate Mode (Alt Mode) to transmit video data. This functionality requires a full-featured USB Type-C cable that contains physical wiring for the high-speed differential lanes. Simple USB Type-C charging cables only contain wires for power delivery and USB 2.0 data, rendering them incapable of carrying video signals to external monitors.

Adım Adım Çözüm

1
Analyze the physical connector vs feature capability of USB Type-C cables.
Recognize that while all USB Type-C cables share the same physical connector shape, internal pin wiring and bandwidth capabilities vary widely.
Basic charging cables often carry only USB 2.0 signal wires along with high-amperage power lines, omitting the high-speed differential pairs required for video.
2
Identify the protocol used for video transmission over USB Type-C.
DisplayPort Alternate Mode (Alt Mode) uses the high-speed lanes inside a fully featured USB Type-C cable to route native DisplayPort video signals to the dock.
Without a fully featured cable wired for high-speed data lanes, Alt Mode negotiation fails and no video is output to external monitors.

Anahtar Kavram

USB Type-C Alternate Mode and Cable Feature Variance
Tahmini Süre:1m 15s
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Display Cables and Connectors

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