Category Archives: DIRAC

Understanding Video Traffic Interference

Understanding Video Traffic Interference

Here is a great discussion on network traffic and video over IP.

By Phil Hippensteel On November 28, 2012

Dear Professor Phil,
At lunch several of us were discussing our new videoconferencing deployment. A debate developed. Some of the group said UDP traffic such as VoIP would be the most likely to interfere with the videoconferencing traffic because it gets high priority, just like the video. Others argued that traffic from TCP data applications would be more of a problem because of their socalled “bursty” nature. Who is correct? Terrance, Canton, OH

Terrance,

Both will cause problems but for very different reasons. The group arguing that VoIP will cause problems is assuming some things. First, to interfere with the video, the voice traffic must be on the same VLAN as the video traffic. Often it is not. Second, if the VoIP and video traffic are on the same physical LAN and have the same priority settings, the VoIP must be using enough of the bandwidth that it constrains the bandwidth available to the video conferencing devices. With good design, this should never happen. So, to summarize this side of the argument, VoIP can interfere with videoconferencing, but only if the network design is inadequate.
On the other hand, TCP traffic such as database applications and web traffic can have unpredictable effects on video conferencing traffic. The burstiness of TCP applications is virtually uncontrollable. It’s the way that TCP protocol works. So, when TCP traffic and video share a physical network, TCP has a tendency to grab all of the bandwidth it can. In addition, the TCP algorithm groups the packets in blocks of packets that can vary in size which is dependent on network conditions and application design. The resulting bursty nature of the traffic increases variation in delivery relative to time, or jitter. If the jitter becomes excessive, the jitter buffers can’t compensate and packets are dropped. This means that it is important to separate video conferencing traffic from data applications using VLANs or completely separate networks.
In addition to all of these facts, my experience has taught me that the group arguing that TCP traffic is more of a problem is indeed correct.

Phil Hippensteel, Ph.D., has spent more than forty years in higher education and now teaches for Penn State Harrisburg.

Posted in DIRAC, H.264, JPEG2000, MPEG-2, Video Networking - Enterprise IPTV, Video Streaming - Webcasting | Tagged , , | Leave a comment

VidOvation announces new MiniConverter product range from NuMedia at InfoComm

VidOvation has announced the product launch by partner NuMedia Technologies of 3 unique HD cable extenders developed in conjunction with Gennum PLC.

Other product includes 3 new Reclocking Distribution Amplifiers with integral cable length measurement.

HDX-SDI 1485Mbps HD-SDI to 270Mbps SDI Encoder/Decoder using DIRAC PRO by NuMedia

HDX-SDI 1485Mbps HD-SDI to 270Mbps SDI Encoder/Decoder using DIRAC PRO by NuMedia

Continue reading

Posted in Conversion and Converters, Convert 3G HD SDI to HDMI, DIRAC, Dirac Pro, News, Partner Profile, Routing - Distribution, Standards, Trade Shows, Video Compression, Video Networking - Enterprise IPTV | Tagged , , , , , , , , , , , , , , , , , , , , , | Leave a comment

Gennum and NuMedia Drive Next-Generation Industrial Connectivity with New Aviia

Enables Long-Distance Digital Transmission of High-Definition Video Over Coaxial Cable Beyond 300 Meters

BURLINGTON, Ontario, April 13, 2011

Posted in Conversion and Converters, DIRAC, Dirac Pro, News, Partner Profile, Standards, Trade Shows, Video Compression | Tagged , , , , , | 1 Comment

COTS SAVES – Identifying the Cost Savings of Technology Standards

Download the presentation by Jim Jachetta for the Panel Session and Q&A on the Implementation of Technology Standards at NAB Military & Government Summit. Learn how the DIRAC video compressions standard can save money transporting 3D, 3G HD-SDI and 1.5G HD-SDI over legacy video infrastructure.

Posted in DIRAC, Dirac Pro, Military - Government, NAB Show, News, Standards, Trade Shows, Video Compression | Tagged , , , , , , , , , , , , , , | 1 Comment

VidOvation Virtual Booth Tour and Interview NAB 2011

VidOvation Virtual Booth Tour and Interview NAB 2011.

VidOvation virtual demonstration of some of the most technologically advanced video communications systems at NAB Show.

Experience VidOvation

Posted in Conversion and Converters, Convert 3G HD SDI to HDMI, DIRAC, Dirac Pro, Education, H.264, JPEG2000, NAB Show, News, Routing - Distribution, Standards, Trade Shows, Video Compression, Video Networking - Enterprise IPTV, Video Streaming - Webcasting, Wireless Video | Tagged , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , | 3 Comments