From your question, I assume that you want to use wireless bridging to backhaul traffic from distributed APs to a central point of Internet access. To avoid cross-channel interference between distributed WLANs and backhaul connections, you'll need to assign non-overlapping channels (e.g., 1, 6, 11 for 802.11b/g). Because you'll also need to avoid interference between distributed WLANs, you may want to consider using 802.11a for your backhaul connections. By using 802.11a, you'll have more non-overlapping channels to choose from, and your backhaul connections will be better insulated from overhead activity (e.g., clients probes/responses) generated by your distributed WLANs. Alternatively, you could use another kind of backhaul network - for example, a wireless mesh interconnecting your distributed APs, or wired backhaul connections. Mesh networking is becoming increasingly popular in municipal wireless networks -- for example, see BelAir Networks, Strix Systems, and Tropos.
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