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