{TAIL ~ One such modem} is typically located at a customer premises such as a home or {HEAD ~ business} and is “downstream” from a central office with which it communicates 
{ TAIL ~ One such modem } is typically located at a customer premises such as a home or { HEAD ~ business } and is “ downstream ” from a central office with which it communicates
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH