In such a stack it is necessary to provide interconnection between the stacked devices via what is known as a cascade connection in order to allow users connected to one device to communicate with {HEAD ~ users} connected to {TAIL ~ other devices} 
In such a stack it is necessary to provide interconnection between the stacked devices via what is known as a cascade connection in order to allow users connected to one device to communicate with { HEAD ~ users } connected to { TAIL ~ other devices }
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 HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL