具体作用见下连接

https://www.zhihu.com/tardis/zm/art/353211287?source_id=1005#:~:text=GSD%E6%98%AF%E8%8B%B1%E6%96%87%22General%20Station%20Description%22%E7%9A%84%E7%BC%A9%E5%86%99%EF%BC%8CGSD%E6%96%87%E4%BB%B6%E7%BF%BB%E8%AF%91%E6%88%90%E4%B8%AD%E6%96%87%E5%B0%B1%E6%98%AF%22%E9%80%9A%E7%94%A8%E7%AB%99%E6%8F%8F%E8%BF%B0%E6%96%87%E4%BB%B6%22%E3%80%82%20%E9%A1%BE%E5%90%8D%E6%80%9D%E4%B9%89%EF%BC%8CGSD%E6%96%87%E4%BB%B6%E7%94%A8%E6%9D%A5%E5%AF%B9%E7%AB%99%E7%82%B9%E7%9A%84%E4%BF%A1%E6%81%AF%E8%BF%9B%E8%A1%8C%E6%8F%8F%E8%BF%B0%EF%BC%8C%E8%BF%99%E4%BA%9B%E4%BF%A1%E6%81%AF%E5%8C%85%E6%8B%AC%EF%BC%9A%E7%94%A8%E4%BA%8E%E7%BB%84%E6%80%81%E7%9A%84%E6%95%B0%E6%8D%AE%E3%80%81%E5%8F%82%E6%95%B0%E3%80%81%E6%A8%A1%E5%9D%97,%28%E8%BD%AF%E4%BB%B6%E5%B1%82%29%E3%80%81%E8%AF%8A%E6%96%AD%E3%80%81%E6%8A%A5%E8%AD%A6%E3%80%81%E5%88%B6%E9%80%A0%E5%95%86%E6%A0%87%E8%AF%86%20%28Manufacturer%20ID%29%E5%8F%8A%E8%AE%BE%E5%A4%87%E6%A0%87%E8%AF%86%20%28Device%20ID%29%E7%AD%89%E7%AD%89%E5%86%85%E5%AE%B9%E3%80%82