The link apparatus also contains circuits for determining when a node has won arbitration over {TAIL ~ another node} competing for time on {HEAD ~ the bus} 
The link apparatus also contains circuits for determining when a node has won arbitration over { TAIL ~ another node } competing for time on { HEAD ~ the bus }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD