▁IE EE ▁ 8 0 2 . 1 1 ▁based ▁W L AN s . ▁If ▁a ▁previously ▁received ▁frame ▁contains ▁an ▁error ▁then ▁a ▁station ▁has ▁to ▁de fer ▁E IF S ▁duration ▁instead ▁of ▁D IF S ▁before ▁transm itting ▁a ▁frame . ▁This ▁is ▁because , ▁although ▁this ▁station ▁was ▁not ▁able ▁to ▁decode ▁the ▁frame , ▁it ▁could ▁be ▁that ▁the ▁intended ▁receiver ▁could ▁decode ▁the ▁frame . ▁It ▁should ▁have ▁the ▁opportunity ▁to ▁return ▁an ▁A cknow led gment ▁frame ; ▁the ▁E IF S ▁ens ures ▁the ▁transmission ▁of ▁the ▁A ck ▁can ▁proceed ▁without ▁inter ference ▁from ▁those ▁not ▁able ▁to ▁decode ▁the ▁frame . ▁▁ ▁This ▁duration ▁is ▁calculated ▁by ▁the ▁below ▁method . ▁ ▁E IF S ▁= ▁Trans mission ▁time ▁of ▁A ck ▁frame ▁at ▁lowest ▁ph y ▁mand atory ▁rate ▁ ▁+ ▁S IF S ▁+ ▁D IF S ▁ ▁See ▁also ▁▁▁ ▁D IF S ▁▁ ▁R IF S ▁▁ ▁S IF S ▁ ▁References ▁▁ ▁E <0x0A> </s> ▁Sw anse a ▁University ▁F . C . ▁is ▁a ▁Wel sh ▁football ▁club , ▁which ▁currently ▁plays ▁in ▁the ▁C ym ru ▁South . ▁They ▁play ▁at ▁Sk et ty ▁Lane , ▁Sw anse a . ▁ ▁History ▁The ▁current ▁team ▁was ▁reform ed ▁as ▁Team ▁Sw anse a ▁in ▁ 2 0 1 1 ▁by ▁students ▁from ▁Sw anse a ▁University . ▁In ▁the ▁period ▁since ▁the ▁club ' s ▁re formation , ▁the ▁club ▁has ▁achieved ▁six ▁prom ot