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Because of the high CRCs, that would usually point to some type of interference or frequency issue. Check with the ISP about their recommended channel settings, making sure of what channels their other wireless clients may be using.Also, the BR500 u...
802.11a and 802.11b use two different chipsets/2 different radios. Therefore two different NIC cards would be required. To date, I am unaware of anyone manufacturing a dual chipset NIC.
Don't forget the fixed antenna. on the 1100. The 1200 and 350 series offer RPTNC ports to allow for different antenna configurations - a plus when designing cell coverage.