{HEAD ~ A better approach} to the problem is to provide {TAIL ~ communications devices} which may themselves be connected together in what may be considered to be a “stack” such that when the capacity of existing equipment is exhausted further capacity may be added by simply adding an additional device to the stack 
is to provide
{ HEAD ~ A better approach } to the problem is to provide { TAIL ~ communications devices } which may themselves be connected together in what may be considered to be a “ stack ” such that when the capacity of existing equipment is exhausted further capacity may be added by simply adding an additional device to the stack
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH