▁may ▁take ▁several ▁seconds ▁which ▁may ▁be ▁un accept able ▁for ▁real - time ▁applications ▁such ▁as ▁Vo IP . ▁In ▁contrast , ▁M PL S ▁local ▁protection ▁meets ▁the ▁requirements ▁of ▁real - time ▁applications ▁with ▁recovery ▁times ▁compar able ▁to ▁those ▁of ▁short est ▁path ▁brid ging ▁networks ▁or ▁S ON ET ▁rings ▁of ▁less ▁than ▁ 5 0   ms . ▁ ▁Compar isons ▁ ▁M PL S ▁can ▁make ▁use ▁of ▁existing ▁AT M ▁network ▁or ▁Frame ▁Rel ay ▁infrastr ucture , ▁as ▁its ▁l abeled ▁flows ▁can ▁be ▁mapped ▁to ▁AT M ▁or ▁Frame ▁Rel ay ▁virtual - circ uit ▁ident ifiers , ▁and ▁vice ▁vers a . ▁ ▁Frame ▁Rel ay ▁Frame ▁Rel ay ▁aim ed ▁to ▁make ▁more ▁efficient ▁use ▁of ▁existing ▁physical ▁resources , ▁which ▁allow ▁for ▁the ▁under pro vision ing ▁of ▁data ▁services ▁by ▁tele communic ations ▁companies ▁( tel cos ) ▁to ▁their ▁customers , ▁as ▁clients ▁were ▁unlikely ▁to ▁be ▁util izing ▁a ▁data ▁service ▁ 1 0 0 ▁percent ▁of ▁the ▁time . ▁In ▁more ▁recent ▁years , ▁Frame ▁Rel ay ▁has ▁acquired ▁a ▁bad ▁reputation ▁in ▁some ▁mark ets ▁because ▁of ▁excess ive ▁band width ▁over book ing ▁by ▁these ▁tel cos . ▁ ▁Tel cos ▁often ▁sell ▁Frame ▁Rel ay ▁to ▁business es ▁looking ▁for ▁a ▁che aper ▁alternative ▁to ▁dedicated ▁lines ; ▁its ▁use ▁in ▁different ▁ge ographic ▁areas ▁dep ended ▁greatly ▁on ▁government al ▁and ▁tele communic ation ▁companies ' ▁policies . ▁ ▁Many ▁customers ▁migr