{HEAD ~ Instead, notification mechanisms} within {TAIL ~ the workstation 114 confirm successful reception}, at a receiving port , of a test request issued from a transmitting port  
within
{ HEAD ~ Instead , notification mechanisms } within { TAIL ~ the workstation 114 confirm successful reception } , at a receiving port , of a test request issued from a transmitting port
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH