Tag Archives: Visionary Solutions

IPTV and the Spanning Tree Process

By Phil Hippensteel

IPTVDear Professor Phil,

We’re using IPTV at our school and have discovered a situation that we don’t understand. The video is delivered over a group of Ethernet switches. When we investigate the individual links, we find some links carry large amounts of traffic, while others transport no traffic at all. Can you offer a possible explanation?
Barry, Alexandria, VA

Barry,

A very likely explanation is that the switches have a loop circuit within them and the spanning tree process has automatically disabled a link. That’s not bad. In fact, it is a very necessary requirement.

IPTVThe spanning tree algorithm is used with Ethernet switches to routinely remove loop circuits. If these loops weren’t removed, a single IP packet carrying video could loop endlessly while consuming valuable bandwidth. To understand essentially how spanning tree works, look at the diagram of a hypothetical network of switches. The simple hexagon with a diagonal has three loops in it: A-D-E-F-A, A-D-C-B-A, and A-B-C-D-E-F-A.

The spanning tree algorithm picks a switch, say B, to be the root of a tree that will be formed. A series of spanning tree messages is sent over the links starting from the root switch, B. These messages allow the switches to discover that a loop exists. For example, in our drawing, switch E received messages from both F and D. Therefore, E disables the link to one of them, say the one to D. In the same manner, C chooses to disable its link to D. After these two operations, the loops are eliminated and the entire structure forms a tree. Now every switch is connected to every other switch through exactly one path. Occasionally, technicians disable the spanning tree operation to reduce traffic, but that is almost always a bad idea.

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

Posted in Applications - Industries, Broadcast, Education, FAQ, Government and Military, H.264, IPTV, MPEG-4 H.264, Professional AV - Pro AV, Sports, Video Compression, Video Networking - Enterprise IPTV, Video Streaming - Webcasting | Tagged , , , , , , , , , | Leave a comment

UK’s Lords calls for IPTV

The House of Lords, the UK’s second legislative chamber, has called for a wholesale switch from digital terrestrial to IPTV.

Original Story from Broadcast Engineering – http://broadcastengineering.com/news/uk-s-lords-calls-iptv

Aug. 13, 2012 11:19am

UK House of Lords Proposes IPTV

UK House of Lords Proposes IPTV

Philip Hunter

The UK’s House of Lords has put its weight behind a wholesale switch from digital terrestrial to broadband for public service broadcast delivery, even though this might in the short term threaten universal access provision.

The House of Lords is the UK’s second legislative chamber whose main function is to revise primary legislation emerging from the House of Commons comprising elected members of parliament (MPs). The House of Lords’ Communications committee has now proposed that broadcasting be moved away from terrestrial delivery towards IPTV and OTT over the Internet as the primary means of distribution. This recommendation is made in the report “Broadband for all,” which sets out an alternative vision to that of the government. The government wants to retain digital terrestrial as the base medium for delivery of services from the country’s Free To Air broadcasters including the BBC and ITV.

Part of this government strategy is to roll out superfast broadband across the country to provide the basis for future multichannel HD services. But surprisingly, the House of Lords questions this, suggesting the nation’s interests might be better served by first ensuring universal access. The problem with this is that such universal access would be at speeds of 2Mb/s at best given current technology, without substantial fiber deployment in remote areas at great cost.

Therefore, the country will probably be better served for universal access in the short term by continuing with digital terrestrial, and in the long term by pursuing superfast broadband. Because of this, the House of Lords report seems to fall between two stools.

Posted in Applications - Industries, Broadcast, Broadcast Engineering, Video Networking - Enterprise IPTV, Video Streaming - Webcasting | Tagged , , , , , , | Leave a comment

Visionary Solutions Details its IPTV Encoders

VidOvation is an authorized Value-added reseller for Visionary Solutions Inc.   VSI provides encoding products for edge acquisition and distribution applications using IP technology. Anywhere that content originates — and anywhere content goes — Visionary Solutions is there to help you leverage the convenience and flexibility of IP whether for acquisition, backhaul, or distribution.

Our solutions are deployed worldwide powering all types of applications:

  • Enterprise and Institutional Pro A/V
  • Broadcast TV
  • High-end Video Surveillance
  • Government and Military
  • Digital Signage

…and many more. Continue reading

Posted in Applications - Industries, Broadcast, Government and Military, MPEG-2, MPEG-2 Basic Training, News, Professional AV - Pro AV, Sports, Video Compression, Video Networking - Enterprise IPTV, Video Streaming - Webcasting | Tagged , , , , , , , , , , , , | Leave a comment

Video Over IP Solutions – NAB Preview Video 3

Let VidOvation show you the cost benefits of implementing video over IP, which is the next generation of communication.  These systems include encoding, decoding and webcasting solutions:

Check out the latest from Visionary Solution’s diverse line of compact encoding solutions.  These solutions have been deployed worldwide powering enterprise and institutional pro A/V, broadcast TV, high-end video surveillance, government, military and digital signage.

For complex applications the ImmediaTV (formerly Magenta Video Networks) line capitalizes on the expansibility of the openGear platform with its extensive line of real-time encoding and decoding solutions.  The future-proof design fits perfectly in the most demanding requirements of contribution and distribution, IPTV, Telco and cable markets. ..

To webcasting solutions such as the Minicaster or VidBlaster.  No matter what your webcasting needs are these two solutions employ the technology to efficiently and effective broadcast over the internet to a diverse range of audiences.

Call today or stop by our NAB booth # SU11012 to experience the VidOvation difference.  Register for a FREE Exhibits Only Pass with VIP Code LV2863.

Stay tuned for more VidOvation informational videos…

Posted in Applications - Industries, Broadcast, H.264, NAB Show, News, NHL - National Hockey League, Professional AV - Pro AV, Trade Shows, Video Compression, Video Networking - Enterprise IPTV, VidOvation Video Report and Newsletter | Tagged , , , , , , , , | Leave a comment

Taking the Leap from Copper to the Network

Taking the Leap from Copper to the Network

Technology changes are inevitable, and you can easily get lost in options, wondering which new gadget or behavior is a trend and which is here to stay.

Posted in DIRAC, Education, FAQ, Flash, H.264, HTML5, JPEG2000, Standards, Video Compression, Video Networking - Enterprise IPTV, Video Streaming - Webcasting, Windows Media | Tagged , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , | Leave a comment