<Tr> <Td> 802.11 g </Td> <Td> Jun 2003 </Td> <Td> 2.4 </Td> <Td> 20 </Td> <Td> 6, 9, 12, 18, 24, 36, 48, 54 </Td> <Td> N / A </Td> <Td> OFDM </Td> <Td> 38 m (125 ft) </Td> <Td> 140 m (460 ft) </Td> </Tr> <Tr> <Td> 802.11 n (Wi - Fi 4) </Td> <Td> Oct 2009 </Td> <Td> 2.4 / 5 </Td> <Td> 20 </Td> <Td> Up to 288.8 </Td> <Td> </Td> <Td> MIMO - OFDM </Td> <Td> 70 m (230 ft) </Td> <Td> 250 m (820 ft) </Td> </Tr> <Tr> <Td> 40 </Td> <Td> Up to 600 </Td> </Tr> <Tr> <Td> 802.11 ac (Wi - Fi 5) </Td> <Td> Dec 2013 </Td> <Td> 5 </Td> <Td> 20 </Td> <Td> Up to 346.8 </Td> <Td> 8 </Td> <Td> 35 m (115 ft) </Td> <Td> </Td> </Tr>

What is the frequency and maximum data rate for 802.11a