多项选择题

Which three are interframe spaces defined in 802.11?()

A.SIFS
B.PIFS
C.DIFS
D.LIFS
E.NAV
F.CWmin

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单项选择题
WhatisthepayloadsizeofawirelessIPphoneinacallusingG.711codec?()

A.20 bytes
B.60 bytes
C.120 bytes
D.160 bytes

单项选择题
WhatcallperformancestatisticsarereportedontheCiscoWirelessIPPhone7921userinterface?()

A.minimum jitter
B.maximum jitter
C.upstream standard packet deviation
D.average MOS value
E.average conceal rate

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