How will the TV traffic impact on our network?
A: All TV and video channels are multicast across the network so the level of traffic does not increase with the number of viewers. It should be assumed that all channels will be present on the backbone of the network and the amount of traffic generated can be calculated as the number of channels multiplied by the bit rate per channel. For example, if 10 channels are required at a bit rate of 4.0 Mbps, (Megabits per second) the bandwidth utilized will be 40 Mbps. Multicast management protocols ensure that streams which are not required on a particular network segment are not forwarded to that segment. This means for instance, that only one stream is present on the local switched connection to an individual PC running IPTV because only one channel is displayed at a time on that PC.