中央新闻纪录电影制片厂 The fourth generation of fiber-optic communication systems used optical amplification to decrease the require for repeaters and wavelength-division multiplexing (WDM) to raise data ability. The introduction of WDM was the beginning of optical networking, as WDM turned the engineering of choice for fiber-optic bandwidth expansion.[24] The initial to marketplace https://kenwood-chef-xl-kitchen-m71481.suomiblog.com/fascination-about-network-49521720