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Zorluk: Çok zorNetwork and Peripheral Cables and Connectors

A systems technician is setting up a external storage array on a workstation that requires a 40 Gbps data transfer rate and host power delivery over a single connection. The technician plugs the storage array into a motherboard physical USB Type-C port using a 1-meter passive USB 3.2 Gen 2x2 rated cable. Although the storage array powers on and functions, benchmarks show data transfers are capped at 20 Gbps. Which of the following best explains why the connection cannot achieve the full 40 Gbps throughput?

  1. The motherboard port is operating under the USB 3.2 Gen 2x2 protocol specification rather than Thunderbolt 3/4 or USB4 standards required for 40 Gbps bandwidth.Cevap
  2. B
    The physical USB Type-C connector requires an active fiber-optic cable for any link operating above 10 Gbps bandwidth.
  3. C
    The technician must enable DisplayPort Alternate Mode in the motherboard BIOS to multiplex storage data channels to 40 Gbps.
  4. D
    The USB Type-C cable lacks an internal e-marker chip, causing the host controller to default to single-lane USB 2.0 legacy transfer modes.

Cevap

The motherboard port is operating under the USB 3.2 Gen 2x2 protocol specification rather than Thunderbolt 3/4 or USB4 standards required for 40 Gbps bandwidth.
The USB Type-C connector is a physical interface specification, while transfer speed is determined by the protocol negotiated between the host controller, cable, and peripheral. USB 3.2 Gen 2x2 uses two 10 Gbps lanes to achieve a maximum throughput of 20 Gbps. Reaching 40 Gbps requires host controller support for Thunderbolt 3, Thunderbolt 4, or USB4 Gen 3x2.

Adım Adım Çözüm

1
Analyze physical connector vs. protocol standards
Recognize that the USB Type-C physical form factor supports multiple independent bus protocols (USB 3.2, USB4, Thunderbolt 3/4, DisplayPort Alt Mode).
Having a physical USB Type-C port does not automatically enable 40 Gbps speed without underlying host controller protocol support.
2
Compare maximum data transfer rates
USB 3.2 Gen 2x2 maximum throughput is 20 Gbps (using two 10 Gbps lanes). Thunderbolt 3, Thunderbolt 4, and USB4 40Gbps achieve up to 40 Gbps.
The observed benchmark cap of 20 Gbps matches the exact structural limit of the USB 3.2 Gen 2x2 standard.
3
Evaluate configuration cause
The bottleneck stems from the port controller hardware standard (USB 3.2 Gen 2x2) rather than cable length, DisplayPort Alt Mode, or fallback to USB 2.0 speeds.
Upgrading host capabilities to Thunderbolt 3/4 or USB4 is required to negotiate 40 Gbps links.

Anahtar Kavram

Physical USB Type-C Form Factor vs. Protocol Standards (USB 3.2 vs. Thunderbolt 3/4 / USB4)
Tahmini Süre:2m 0s
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Network and Peripheral Cables and Connectors

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