A ball grid array can then be used to connect the signal contacts and {HEAD ~ ground} at {TAIL ~ the bottom} of the substrate with a circuit board 
A ball grid array can then be used to connect the signal contacts and { HEAD ~ ground } at { TAIL ~ the bottom } of the substrate with a circuit board
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH