TECHNICAL
is that for this technique to work, extra bandwidth for the FEC data is required. FEC packets are sent whether they are needed or not, using up additional bandwidth. SRT only resends packets if it detects that they are being lost in the process, preserving valuable bandwidth. How WISI is Transforming Video Delivery With a Comprehensive SRT Product Family: As a member of the SRT Alliance and leading provider of solutions for Pay-TV operators, WISI offers support for the SRT protocol in its Intelligent Headend Product family, which includes the Inca IP Video Platform, Tangram High-Density Video Platform, and Chameleon Headend Platform. We offer operators an unparalleled level of flexibility, with high-density video platforms capable of sending and receiving SRT streams and outputting in IP, QAM, analogue, ASI or SDI. Moreover, our solutions also feature powerful management and monitoring tools, providing operators with increased visibility into the health of video streams being delivered over SRT. Key applications for SRT: n Remote content creation and distribution n Wholesale distribution n Hospitality n Live events and sports n Satellite replacement for small headends n Direct connections to broadcasters n Headend consolidation Preparing for the Future of Television With ATSC 3.0 ATSC 3.0, also known as NEXTGEN TV, is a new broadcast television standard created by the Advanced Television Systems Committee (ATSC). It has been deployed in North America, South Korea, and Jamaica. Brazil has also announced that it will use essential ingredients of the standard as the country transitions to a next-generation television system, and other countries around the world are looking into its benefits.
is that the next-generation terrestrial broadcast system is built on IP, bringing together over-the-air and over-the-top content. By adopting technology that supports ATSC 3.0, operators will be able to provide viewers with higher quality experiences, including 4K and 8K, along with immersive audio. Ultimately, ATSC 3.0 is a way for operators to deliver local TV channels, news channels and live sports with superior quality and a better experience to end users. Market Drivers for ATSC 3.0 By the end of 2022, approximately 66 broadcast television markets 10 had successfully deployed ATSC 3.0 in the U.S. In 2023, more broadcasters are expected to roll out the new technology. As the broadcast industry embraces ATSC 3.0, Pay-TV operators need to ensure that they can receive NEXTGEN TV signals. While ATSC 3.0 is not yet a mandatory format for video operators in the United States, the new standard is the future of over-the-air TV and lays the foundation for a more engaging, immersive television experience. At some point in the future, ATSC 1.0 signals will be turned off, and if operators don’t have the capability to support ATSC 3.0, they risk being left behind. As ATSC 1.0 receive equipment ages out or starts failing, it only makes sense to replace this with ATSC 3.0 compatible equipment. By investing in new technologies now, operators can ensure their video network is future-proof and have peace of mind that they are ready for the future of television. Benefits of ATSC 3.0 The compatibility of ATSC 3.0 with existing infrastructure makes it a cost- effective and easy-to-launch solution. Benefits of ATSC 3.0 for operators include: n Better signal quality: ATSC 3.0 offers a new modulation scheme that is based on OFDM (Orthogonal Frequency Division Multiplexing) modulation. OFDM is more spectrally efficient and less susceptible to multi-path interference, ensuring better signal quality. n Superior video and audio: ATSC 3.0 enables the delivery of 4K/ UHD content, including wide colour gamut, high dynamic range and high frame rate images, with Dolby AC-4 Atmos audio, bringing a more visually
need a way to ensure secure transport of video streams. Also, operators want to increase the efficiency of the video delivery process, and SRT offers unparalleled efficiency. Moreover, operators have a strong desire to move away from the high costs of satellite transmission or dedicated fibre links. The cost savings of SRT can be huge compared with using a satellite downlink. Benefits of SRT SRT offers multiple advantages for cable operators, including: n Increased security and reliability: SRT protects video streams using industry- standard encryption AES 128/256, the same type of encryption that is trusted by governments and organisations around the world. SRT protects content throughout the entire video chain, from contribution to distribution, in turn protecting precious revenue streams. Offering an unparalleled level of reliability, SRT optimises streaming performance across noisy or unpredictable networks while addressing security concerns. n Exceptional quality: SRT protects against jitter, packet loss, and bandwidth fluctuations to help ensure the best viewing experience. Leveraging advanced low latency retransmission techniques, the protocol protects streams against packet loss. As video and audio packets are streamed between two endpoints, SRT detects and adapts to the real-time network conditions between the source and destination devices. n Outstanding flexibility: Video delivery is constantly evolving, and now more than ever operators need flexible solutions. Unlike other proprietary protocols, which are expensive to implement and difficult to implement from an interoperability standpoint — SRT is an open-source protocol. Being an open-source protocol, SRT simplifies interoperability between distribution and contribution devices, giving operators the freedom to work with devices from different vendors. n Groundbreaking efficiency: SRT is more efficient than alternative protocols, including Real-time Transport Protocol (RTP), which relies on Forward Error Correction (FEC) to recover corrupted or missing data. The drawback of using RTP+FEC
The key difference between ATSC 3.0 and the previous ATSC 1.0 standard
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Volume 46 No.2 MAY 2024
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