https://hungwenlin.com/blog/2010/%e5%8f%b0%e7%81%a3-wimax-%e7%94%a2%e6%a5%ad%e6%b2%92%e6%a9%9f%e6%9c%83%ef%bc%9f%e7%ad%94%e6%a1%88%e5%89%9b%e5%a5%bd%e7%9b%b8%e5%8f%8d%ef%bc%81%e5%9b%9e%e6%95%99%e4%b8%96%e7%95%8c%e6%88%90%e7%99%bc/