Blockage levels are first translated into transmission link parameters, from which {HEAD ~ the methods} of {TAIL ~ bit rate reduction}, increasing modem density, or system bandwidth, or higher encoding rate are derived 
of
Blockage levels are first translated into transmission link parameters , from which { HEAD ~ the methods } of { TAIL ~ bit rate reduction } , increasing modem density , or system bandwidth , or higher encoding rate are derived
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH