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