BitTorrent is a peer-to-peer (P2P) protocol for sharing media (audio, video and software) files that accounts for 18% of traffic on cable high-speed data networks. In order to better understand the network dynamics of traffic associated with this protocol, we analyzed roughly 1 Gbytes of network trace data from BitTorrent clients running in three different environments. Based on this data, we performed a simulation-based analysis of a DOCSIS®- based cable network involving a varying number of simulated BitTorrent users and web browsing users. Our results suggest that as few as 10 BitTorrent clients can double the access delay experienced by other non-BitTorrent users.