In {TAIL ~ operation}, {HEAD ~ USB host} 12 may provide the VBUS power signal 24, as well as the other three USB signals  
In
In { TAIL ~ operation } , { HEAD ~ USB host } 12 may provide the VBUS power signal 24 , as well as the other three USB signals
REL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH