Cables have only plugs, and hosts and devices have only receptacles. Hosts have type-A receptacles; devices, if 642-901 they have receptacles, have type-B. Type-A plugs only mate with type-A receptacles, and type-B with type-B.
The On-the-Go supplement allows a product to be either host or device, with a Micro-AB receptacle that accepts either a Micro-A plug or a Micro-B plug. Micro-A, Micro-B, and Micro-AB connectors are identified 650-621 easily by color. The plastic inside Micro-A plugs and receptacles is always white, that in Micro-B connectors black, and that in Micro-AB receptacles grey.
There is a limited set of cables allowed by the USB specification. Cables fall into two categories — "detachable" and "captive". All allowed USB cables have one type-A plug, either Standard-A or Micro-A. 646-230 The other end of a "captive" cable is either not removable or it has a custom connector on the device end. If the cable is "detachable", the other end of the cable must have a type-B plug. There also exists a special adapter cable that has micro-A plug and standard-A receptable.
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