802.11a is in the 5GHz range. it is not compatible with 802.11b or 802.11g except if the 802.11a device is going through an access point that is 802.11a/b/g compatible and then out to an 802.11b or 802.11g device.
BEFW11S4 is a 802.11b AP/router. The data sheet on linksys.com says it's WiFi compliant. but being WiFi compliant doesn't mean much to the average user.
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