With the presence of a corresponding control signal a line switching connection is established from {TAIL ~ the first switch} to the second switch and {HEAD ~ the data} are then transferred through this connection 
With the presence of a corresponding control signal a line switching connection is established from { TAIL ~ the first switch } to the second switch and { HEAD ~ the data } are then transferred through this connection
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH