Recycled from an earlier posting. The 108 and 54mbits/sec are the connection speeds before protocol overhead. With an 802.11g only54Mbit/sec connection, you'll get about 25-30Mbits/sec. What are you getting and how are you measuring it?
I keep getting asked "how fast can it go" type questions. Perhaps some numbers might help. This is stolen from an Atheros PDF at:some additions and corrections by me.
Non-overlapping Modulation Max Max Max Channels ------- | Link TCP UDP | | | | |802.11b 3 CCK 11 5.9 7.1 802.11g (with 802.11b) 3 OFDM/CCK 54 14.4 19.5 802.11g only 3 OFDM 54 24.4 30.5 802.11g turbo 1 OFDM 108 42.9 54.8 802.11a 13 OFDM 54 24.4 30.5 802.11a turbo 6 OFDM 108 42.9 54.8
The paper claims that encryption is enabled for these calculations, but my numbers seem to indicate that these number are for encryption disabled. Dunno for sure. The Max TCP and Max UDP are the theoretical maximum thruput rates.