{HEAD ~ means} for separating the DC power and {TAIL ~ the control signals} from the RF video signals 
for separating
{ HEAD ~ means } for separating the DC power and { TAIL ~ the control signals } from the RF video signals
HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH