2. USB specifications

2.1 Physical layer

Two connector variants are used (figure 5 ):

variant "A" for the cable end "rising to the top", i.e. directed towards the master;
another variant called "B" for the other end, directed at the slave devices that form the leaves of the tree structure.

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USB specifications

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(1) - - Universal Serial Bus Specification 1.1.
(2) - - Universal Serial Bus Specification 2.0.
(3) - Universal Serial Bus Specification Architecture. - Don Anderson, Mindshare inc. Addison-Wesley...

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