Good write ups. Thanks.
try this https://shallbd.com/pt/entendendo-a-faixa-de-frequencia-da-tecnologia-de-rf-sobre-fibra-tudo-o-que-voce-precisa-saber/
click here to read https://shallbd.com/zh/fa-xian-m15-wai-hui-jiao-yi-ce-lue-de-mi-mi-ti-gao-jiao-yi-cheng-gong-lu/