Tonetron Cable & Adapter Factory

2026-11-02

TTBy Tonetron Engineering Team · Dongguan Taitron Electronic Limited

What does "full-function USB-C cable" actually mean?

A marketing phrase, not a specification. Ask which USB data rate, whether DP Alt Mode is supported, and what current the E-Marker declares.

Answer: it has no formal definition — it usually means USB data + DisplayPort Alt Mode + PD in one cable, but the numbers still have to be asked for.

Replace it with three questions:

  1. Which USB data rate is certified (2.0 / 5 / 10 / 20 / 40 / 80 Gbps)?
  2. Is DisplayPort Alt Mode supported, and at what lane count?
  3. What current does the E-Marker declare (3 A or 5 A)?

A spec sheet that answers all three is worth more than the phrase.

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Frequently asked questions

What is a full-function USB-C cable?

A marketing phrase, not a spec — ask for the USB data rate, DP Alt Mode support and the E-Marker current.

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