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 {HEAD ~ existing equipment} is exhausted further capacity may be added by simply adding an additional device to the stack 
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 { HEAD ~ existing equipment } is exhausted further capacity may be added by simply adding an additional device to the stack
OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH