{HEAD ~ a second amplifier} configured for amplifying the data received from the second I/O port and outputting {TAIL ~ the amplified data} to the first I/O port 
configured for outputting
{ HEAD ~ a second amplifier } configured for amplifying the data received from the second I / O port and outputting { TAIL ~ the amplified data } to the first I / O port
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH