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This thesis investigates techniques for improving the security and availability of secure wireless multimedia systems. Three effects are discussed in this study: 1) The effect on the audio-video capacity of the wireless system by securing the voice signal is measured; 2) The effect of the audio-video traffic originating foreign to the measured wireless local area network, thus using an access point to forward the traffic is evaluated; and 3) The effect of using an audio-only signal compared with an audio-video signal is also related to the capacity of the wireless system.