However, you have not taken into account any external competition for the channel used by the AP. That's fine if you can find a clear unused channel for your wireless LAN (WLAN), but doing so is not always easy for 802.11g WLANs that operate in the crowded 2.4 GHz band. Furthermore, if you wanted to support additional clients, you might do so by installing a total of up to three APs, configured for Channels 1, 6, and 11 -- all using the same SSID. Finally, you don't say whether your client applications will actually have a sustained data flow of 1 Mbps to send. For example, if your client applications simply send brief bursts of short frames, you might support many more clients using a single AP. In short, I think you're on the right track with your calculations, but recommend you think not only about network hardware capacity but how you'll deploy and use that capacity.
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