The output side 16 includes {HEAD ~ a plurality} of switching modules 22, including {TAIL ~ first, second and third modules} 24, 27 and 29, respectively 
The output side 16 includes { HEAD ~ a plurality } of switching modules 22 , including { TAIL ~ first , second and third modules } 24 , 27 and 29 , respectively
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH