| Korea Telecom: A case study of all-in-one multi-service media transport solution |
| Posted: February 2009 | ||||||
 The CompanyDrawing on cutting-edge technology, Korea Telecom (KT) has played a key role in turning South Korea into an IT and electronics giant
on the world stage. Established in1981, KT’s goal is to build a network infrastructure that enables it to maintain and strengthen its communication leadership. A key requirement for the future network infrastructure is to provide flexible and expandable media transport with high quality of service. The Issue KT initially needed to provide a solution for broadcaster Seoul Broadcasting System (SBS), who would use the network for video and audio services between Seoul and nine other cities in South Korea. The same network should also allow each local broadcasting company to send uncom¬press¬ed HD and SD video for contribution purposes and to share the content between SBS and local sites. Several local studies have concluded that terrestrial TV services should be distributed in un¬compressed format as far out in the network as possible to minimise problems with pixeli¬sation and latency. This calls for a cost-effective infrastructure that is able to combine distribution and contribution of video services. If possible, the same transport platform should also support radio channels, digital audio services and IP/Ethernet data. Other key requirements include high availability of services providing resilience against failures of both equipment and transmission media, and a flexible multicasting mechanism to allow KT to monitor the video services carried between SBS and local broadcasters. The Solution Initially, KT carried out extensive qualification testing of multiple vendors in their labs. The tests included product functions and characteristics, temperature cycling and other climatic tests, and network management. As a result of the tests, Net Insight’s Nimbra platform came out as the preferred solution. As KT wants to offer its customers the ability to distribute uncompressed HD video end-to-end, the low latency of Nimbra is a crucial success factor. KT was also impressed by the strong features of the Nimbra Vision network management system. KT will make the most of the multi-service transport capability of the Nimbra platform by combining HD-SDI, SDI, ASI, AES/EBU, IP/Ethernet, and E1 services over 2.5Gbps high-capacity transport links. The initial deployment for SBS comprises over 100 Nimbra 300 series nodes in dual-ring topology for maximum availability. Given the flexible topology support offered by the Nimbra platform, which allows for a complete mesh network, KT can easily expand the network as customer demand grows. A newly added Nimbra node instantly and automatically establishes contact with all existing network nodes and vice versa. The Nimbra platform’s flexible multicast solution enables KT to monitor the quality of transmitted video services at its own premises. The Nimbra platform also offers 1+1 redundancy with automatic switching and re-routing in case of failures. The end-to-end provisioning capabilities and graphical overview featured in the Nimbra Vision management system makes it easy to manage and monitor the network and allows for easy set-up of dedicated end-to-end transport of media contents. The Results The Nimbra solution was installed in KT’s network during the fourth quarter of 2007 connecting Seoul with nine other cities in South Korea, delivering all required media services for SBS and local broadcasters. Net Insight’s partner, Sanam Technologies, and systems integrator Yukyung Technologies have built up local training and support facilities to help KT make the most of the solution. Jeoung Ha-Myung, general manager for the leased-line technology support team at KT, explained why the company chose Net Insight’s Nimbra platform: “We take great pride in being the world’s leading broadband operator. We take even greater pride in combining our industry-leading know-how with partners and operators around the globe as they deploy networks that push technology and solution offerings to even higher levels in the global telecom market and Net Insight fits well into this.” Add this page to your favorite Social Bookmarking websites       
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