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