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