If you have a 802.11g module in the AP1100, it is 54Mbps. If not, it is 11Mbps
All 108Mbps technologies are propietary. You need to use equipment from the same vendor for 180Mbps. Both DWL-G650 and AP1100 support 802.11b or 802.11g. The maximum speed for 802.11b is 11Mbps and that of 802.11g is 54Mbps.