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Phil Hippensteel

Phil Hippensteel on IP Video Types and Networks: IPTV

The last newsletter focused on video conferencing and how it operates on an IP network. Now our study will consider the forms of video that depend directly on IP and the MPEG transport stream format. This format was first used in enterprise and carrier networks to support what has been called IPTV. However, it now includes digital signage and some forms of streaming video. While I’ll call all......

Phil Hippensteel on IP Video Types and Networks: Videoconferencing

In our newsletters we’ve focused on the importance of the layer four protocols, TCP and UDP. This is important to understand so that now we can discuss how each of the major categories of IP video behaves on an IP network. In the next few newsletters we’ll look at each of the following video types: video conferencing, IPTV, adaptive bit rate video and surveillance video. IPTV will include other......

Phil Hippensteel on The Effect of Network Jitter

In previous newsletters, we talked about the effect that packet loss and network latency would have on IP video. In both cases, we found that any deterioration of the video depended on whether the transport protocol in use was TCP or UDP. Today, we will study network jitter and see what problems it might cause.First, we should clarify what the term network jitter means. Suppose a source sends......

Phil Hippensteel on The Effect of Network Packet Loss

In our last newsletter, we investigated the effect of network latency on IP video. We found that if latency was high, video transported with TCP might pause but would show no other signs of deterioration. On the other hand, when UDP was used as the transport protocol, buffers in the network or at the receiver might empty causing the video to pause. Or, buffers in the network could overfill,......

Phil Hippensteel on The Effect of Network Delay

In our last newsletter, we discussed the important differences that result from using TCP (Transmission Control Protocol) rather than UDP (User Datagram Protocol) as the transport protocol for IP video.  You will recall that TCP guarantees delivery, adapts automatically to network conditions, and adapts to competing traffic levels.  On the other hand, UDP simply sends packets as fast as the......

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