中广协会电视文艺工作委员会 The fourth generation of fiber-optic conversation systems made use of optical amplification to decrease the need for repeaters and wavelength-division multiplexing (WDM) to improve details capability. The introduction of WDM was the beginning of optical networking, as WDM turned the technological innovation of option for fiber-optic bandwidth enlargement.[24... https://ricardox23f4.thelateblog.com/34260151/network-options