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This paper explores the possible effects on the performance of IEEE 802.11 when high-rate real-time applications such as video streaming are transmitted simultaneously with data over the network. While most of the studies conducted have been limited to 802.11b and 802.11g; this study focuses on the newer 802.11n. It considers the effect on performance parameters like throughput, jitter and packets lost when video transmission is introduced in a network carrying purely data traffic. It also gives insight on the approximate number of users streaming high rate videos that can be supported over different environments (commercial, residential, and isolated) on 802.11n.