We developed a JPEG-XS codec-based video transmission system corresponding to 8K UHDTV. JPEG XS has attracted attention as a mezzanine compression technology for IP interfaces such as SMPTE ST 2110-22. JPEG-XS is known for its high compression efficiency, picture quality, and very low latency, but there have not been any products adapted to 8K formats to date. In contrast, migration of interfaces from SDI to IP in program production facilities such as TV studios or OB vans is accelerating. It is important to define a network design starting with its bitrate per stream, especially in large-scale production systems, because the quantity of network switches and bandwidth in a backbone network design greatly affects development costs, system complexity, and feasibility. We developed an 8K JPEG-XS software-based codec prototype using only a CPU and not GPU, with which we were able to confirm 8K/60p video quality in real time at various compression ratios. For higher flexibility, the decoder can decode an 8K resolution image by using the full bit stream, or a 4K resolution image by decoding only parts of the bit stream. In terms of efficient system design, we gave it a scalable decoding function, which can also achieve 4K-resolution video, by partially using an 8K code stream. In this paper, we will introduce the results of the quality evaluations and propose an appropriate bitrate for the 8K JPEG-XS case. Furthermore, we will refer to an example of network design, where it is used in a large-scale, multi-resolution production system for which we are doing such evaluations.