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E-marking On Type-C Cable Thunderbolt™ 3 Cable

- Feb 17, 2017 -

E-marking on Type-C Cable Thunderbolt™ 3 Cable USB C TO USB C


Question:Under what conditions is an E-marker IC required in a Type-C to Type-C cable? When is an E-marker IC required at both ends of a Type-C to Type-C cable?

Answer: 

E-marking (having a Type-C controller) for the Type-C to Type-C cable is required under the following conditions:

  • If the Type-C cable is required to support more than 3A  current

  • If the Type-C cable is a full featured cable i.e, if the cable either supports either USB 3.1 Gen1 or USB 3.1 Gen2 signaling

For Type-C passive cable assembly, having E-marker IC at one end of the cable would be enough. Having an E-marker IC at both ends of the cable would be required for Type-C active cable designs wherein additional electronics such as re-drivers is required to recondition the USB high-speed data signals. In active cable designs, each end of the cable can have different active function. A DFP will query the cable to know the features supported at each end of cable.



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