Backup STL links
Jan 18, 2009 9:14 AM, By Russell Brown
Internet
If the transmitter is located where there is access to a very high-speed Internet connection (i.e. collocated with a wireless Internet provider), then it may be possible to use the Internet to transport the ASI stream to the transmitter site.
Figure 3
Click to enlarge
Once the ASI is converted to an IP-based stream, then the TsoIP can be routed to the studio’s broadband connection and then up to the transmitter. While many companies use the Internet to deliver large amounts of data in real time, this is probably not possible in many locations. But as high-speed Internet connections become more common, this scenario will become more likely. Again, this is only being proposed as a temporary backup to the main link to the transmitter.
Future networks
As digital television evolves, the use of IP networks will surely evolve with it. Instead of simple point-to-point microwave links carrying audio and video, TV stations can create their own data networks that relay streams of audio and video. An ENG crew can tap into the network via a microwave link and have a two-way link to the studio as well as be able to transport their video feed in real time. Just like you can send a file anywhere on your office network, personnel can send real-time video as well as files to any point on this video streaming network. (See Figure 3.)Some of these topics, including IP encapsulation of video streams, will be addressed at the upcoming VidTrans 2009 Conference and Expo next month. More information can be found at www.videoservicesforum.org.
Acknowledgments
Tim Pozar of StreamQ and Steven Williams of Wireless Guys contributed to this tutorial.
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