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