{HEAD ~ The switching hub} transmits {TAIL ~ the received data} only to designated ones among the connected devices, and transmits the received data to the repeater hub 
transmits
{ HEAD ~ The switching hub } transmits { TAIL ~ the received data } only to designated ones among the connected devices , and transmits the received data to the repeater hub
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH