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Offering IPTV to broadband access subscribers is a key challenge as well as a prospective revenue source for ISPs. Despite of its growing interest, no comprehensive study has presented the traffic details of real-world commercial IPTV services yet. We have measured commercial IPTV traffic via four different residential broadband access networks, namely xDSL, Cable, FTTB, and FTTH. In this paper, we present traffic statistics and insight of the IPTV traffic impact onto these end- subscriber broadband accesses. We also present the mathematical formulas to describe traffic behavior and bandwidth demand in IPTV VoD services.