{HEAD ~ The network processor} is communicatively coupled to {TAIL ~ the ingress module} and the egress module 
is communicatively coupled to
{ HEAD ~ The network processor } is communicatively coupled to { TAIL ~ the ingress module } and the egress module
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH