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World's first successful demonstration of STL using IP/PTP on microwave utility line

World's first successful demonstration of STL using IP/PTP on microwave utility line


Media Links has become the first in the world to successfully demonstrate PTP and STL transmission using IP over a microwave dedicated line. Microwave dedicated lines are widely used for STLs at many broadcasting stations both in Japan and overseas. With the success of this demonstration, Media Links will provide STL transmission using the IP/PTP transmission method to broadcasting stations both in Japan and overseas. Broadcasting systems are rapidly changing from networks using conventional coaxial cables to systems using new IP-based technologies. However, for STLs, which are the backbone of many broadcasting networks, the location of transmitting stations is often not suitable for wired networks (such as mountaintops), making microwave transmission indispensable. For this reason, the development of IP transmission technology using PTP over microwave has become important.

Media Links was the first to develop and deploy STL using PTP over a wired IP network (STL over IP/PTP). Building on this innovative work, we have developed a new technology solution (STL over IP/PTP Microwave) that enables STL over IP/PTP over dedicated microwave circuits.

Media Links conducted a demonstration experiment of this technology in collaboration with its partner Oscilloscopes over an existing microwave link. The experiment was conducted at a broadcasting station in the Philippines from May 13 to 17, 2024, and Media Links' STL over IP/PTP device MDP3020 SFN was used to transmit broadcast content and PTP timing, while the station's existing equipment was used for regular microwave transmission and reception. As a result, it was confirmed that signal transmission worked normally and that PTP timing was transmitted accurately. This marked the world's first successful realization of STL over IP and PTP over a microwave link.

Media Links President and CEO Tsukasa Sugawara commented, “The success of this PoC has made it possible to achieve STL transmission over microwave lines with IP/PTP, which has been difficult to achieve until now when converting broadcast station systems to IP. Going forward, we would like to propose not only converting broadcast stations to IP, but also converting STL transmission to IP, and realize the complete conversion of broadcast systems to IP.”

Anil K Reddy, Vice President, Oscilloquartz, Adtran Networks, commented, “We are pleased with the successful trial of PTP over IP microwave network using OSA synchronization technology. Adtrans Oscilloquartz's innovative and versatile solution delivers the highest timing accuracy required for packet broadcast networks, both wired and wireless networks, resulting in a better experience.”




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