) ▁duration , ▁it ▁is ▁then ▁permitted ▁to ▁transmit ▁a ▁frame . ▁If ▁the ▁channel ▁is ▁found ▁busy ▁during ▁the ▁D IF S ▁interval , ▁the ▁station ▁should ▁de fer ▁its ▁transmission . ▁ ▁D IF S ▁duration ▁can ▁be ▁calculated ▁by ▁the ▁following ▁method . ▁ ▁D IF S ▁= ▁S IF S ▁+ ▁( 2 ▁* ▁S lot ▁time ) ▁▁ ▁IE EE ▁ 8 0 2 . 1 1 g ▁is ▁back ward ▁compatible ▁with ▁IE EE ▁ 8 0 2 . 1 1 b . ▁When ▁these ▁devices ▁are ▁associated ▁with ▁same ▁AP ▁all ▁the ▁timing ▁parameters ▁are ▁changed ▁to ▁ 8 0 2 . 1 1 b . ▁ ▁See ▁also ▁▁▁ ▁S IF S ▁▁ ▁P IF S ▁▁ ▁A IF S ▁▁ ▁R IF S ▁▁ ▁E IF S ▁▁ ▁D CF ▁ ▁References ▁▁ ▁D ▁Category : Media ▁access ▁control <0x0A> </s> ▁Herbert ▁H ü bel ▁( born ▁ 1 0 ▁January ▁ 1 9 5 8 ▁in ▁Sal zburg ) ▁is ▁an ▁Aust rian ▁lawyer ▁and ▁sports ▁official . ▁ ▁H ü bel ▁has ▁a ▁doctor ate ▁in ▁law ▁and ▁runs , ▁alongside ▁his ▁partners , ▁a ▁law ▁office ▁in ▁Sal zburg . ▁His ▁father , ▁who ▁was ▁also ▁a ▁lawyer , ▁worked ▁as ▁a ▁football ▁official , ▁too ▁ ▁Since ▁ 1 9 8 4 , ▁H ü bel ▁has ▁been ▁an ▁active ▁in ▁various ▁functions ▁of ▁the ▁Sal zburg ▁Football ▁Association . ▁In ▁ 1 9 9 9 , ▁he ▁was ▁elected