▁an ▁aid ▁or ▁help ▁menu ▁and ▁the ▁last ▁tab ▁within ▁parameters ▁describes ▁briefly ▁the ▁tool ▁k it ▁the ▁version ▁and ▁the ▁history ▁of ▁the ▁transport ▁application ▁tool ▁k it ▁to ▁date . ▁ ▁T ET RA ▁En hanced ▁Data ▁Service ▁( T ED S ) ▁ ▁The ▁T ET RA ▁Association , ▁working ▁with ▁E T SI , ▁developed ▁the ▁T ED S ▁standard , ▁a ▁wide band ▁data ▁solution , ▁which ▁enh ances ▁T ET RA ▁with ▁a ▁much ▁higher ▁capacity ▁and ▁through put ▁for ▁data . ▁In ▁addition ▁to ▁those ▁provided ▁by ▁T ET RA , ▁T ED S ▁uses ▁a ▁range ▁of ▁adapt ive ▁mod ulation ▁schemes ▁and ▁a ▁number ▁of ▁different ▁car rier ▁sizes ▁from ▁ 2 5   k Hz ▁to ▁ 1 5 0   k Hz . ▁Initial ▁implementations ▁of ▁T ED S ▁will ▁be ▁in ▁the ▁existing ▁T ET RA ▁radio ▁spectrum , ▁and ▁will ▁likely ▁employ ▁ 5 0   k Hz ▁channel ▁band width s ▁as ▁this ▁enables ▁an ▁equivalent ▁coverage ▁foot print ▁for ▁voice ▁and ▁T ED S ▁services . ▁T ED S ▁performance ▁is ▁optim ised ▁for ▁wide band ▁data ▁rates , ▁wide ▁area ▁coverage ▁and ▁spectrum ▁efficiency . ▁ ▁Adv ances ▁in ▁D SP ▁technology ▁have ▁led ▁to ▁the ▁introduction ▁of ▁multi - car rier ▁transmission ▁standards ▁employ ing ▁Q AM ▁mod ulation . ▁Wi MAX , ▁Wi - Fi ▁and ▁T ED S ▁standards ▁are ▁part ▁of ▁this ▁family . ▁ ▁Refer ▁also ▁to : ▁ ▁JS R -