When we say below that USB4 will incorporate the Thunderbolt 3 protocol, it means that Thunderbolt 3-connected products will be able to work through USB4 ports-assuming the vendor implements the support, and assuming an appropriate cable is used. A protocol may be released as an entire specification, or be part of a specification. The protocol may describe the nature of the data and how it is sent, and also what the physical delivery system is (usually a cable). What’s a protocol?: A protocol, in the context of USB connectivity (and networking in general), is a term that describes how two devices communicate with one another. All manufacturers of the product are expected to follow the specification, though they may choose to follow only parts of it (this is where the confusion starts with USB). What’s a specification?: A specification, such as the USB4 specification, is a document that describes a technology and how to implement it, and is something that’s been agreed upon by a standards group or trade group. We’ll start with some short answers for what you need to know, then follow with more detail if you want to dive deeper. We’ll help you decipher what the USB landscape is today and where it’s headed with USB4.
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