▁S IF S ▁separated ▁response ▁frames ▁are ▁expected ▁from ▁the ▁receiver . ▁The ▁value ▁of ▁R IF S ▁is ▁ 2 μ s ▁for ▁ 8 0 2 . 1 1 n ▁ph y . ▁ ▁The ▁use ▁of ▁R IF S ▁is ▁ob sole te ▁from ▁ 8 0 2 . 1 1 ac ▁am end ment ▁on wards . ▁An ▁ 8 0 2 . 1 1 ac ▁station ▁will ▁not ▁transmit ▁frames ▁separated ▁by ▁R IF S . ▁So ▁a ▁ 1 1 ac ▁station ▁operating ▁in ▁HT ▁mode ▁sets ▁the ▁R IF S ▁mode ▁field ▁in ▁HT ▁operation ▁element ▁to ▁ 0 . ▁ ▁See ▁also ▁▁ ▁S IF S ▁- ▁Short ▁Inter frame ▁Space ▁ ▁P IF S ▁- ▁P CF ▁Inter frame ▁Space ▁ ▁D IF S ▁- ▁D CF ▁Inter frame ▁Space ▁ ▁A IF S ▁- ▁Ar bitr ation ▁Inter frame ▁Space ▁ ▁P CF ▁- ▁Point ▁Co ord ination ▁Function ▁ ▁References ▁▁ ▁R <0x0A> </s> ▁Medicine ▁Hat ▁High ▁School ▁( H at ▁High ) ▁is ▁a ▁high ▁school ▁of ▁approximately ▁ 1 3 0 0 ▁students . ▁It ▁is ▁located ▁in ▁Medicine ▁Hat , ▁Al berta , ▁Canada . ▁It ▁is ▁a ▁member ▁of ▁School ▁District ▁ 7 6 ▁( SD 7 6 ), ▁Medicine ▁Hat ' s ▁main ▁public ▁district ▁and ▁has ▁the ▁largest ▁capacity ▁of ▁all ▁schools ▁within ▁Medicine ▁Hat , ▁Al berta . ▁ ▁M H HS ▁was ▁originally ▁built ▁in ▁ 1 9 5 2 . ▁The ▁majority ▁of