Use of a high power sounding {TAIL ~ burst} on the outbound link permits: 1) antenna diversity selection to minimize the probability of a faded condition, 2) local frequency locking at the subscriber terminal which avoids the requirement for a costly precision frequency standard, and 3) {HEAD ~ essentially instantaneous inbound power control} based on the outbound receive signal level 
Use of a high power sounding { TAIL ~ burst } on the outbound link permits : 1 ) antenna diversity selection to minimize the probability of a faded condition , 2 ) local frequency locking at the subscriber terminal which avoids the requirement for a costly precision frequency standard , and 3 ) { HEAD ~ essentially instantaneous inbound power control } based on the outbound receive signal level
OTH OTH OTH OTH OTH OTH 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 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 HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH