Most 802.11g products can be configured to operate in 802.11g-only mode (ERP-OFDM), 802.11b mode (ERP-DSSS/CCK), or mixed 802.11b/g mode. The standard defines operation in both of these modes (and two other optional compatibility modes). The Wi-Fi Alliance tests 802.11g products for ability to interoperate with 802.11b reference implementations. However, it's up to you as the network owner to decide how you want to configure your 802.11g AP. If you don't have any 802.11g clients to support, you can usually configure your AP for 802.11g only mode to optimize operation.
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