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