中广协会信息资料委员会 The fourth generation of fiber-optic interaction systems used optical amplification to reduce the have to have for repeaters and wavelength-division multiplexing (WDM) to boost info potential. The introduction of WDM was the start of optical networking, as WDM grew to become the technologies of choice for fiber-optic bandwidth expansion.[24] https://charlietneuj.answerblogs.com/34094027/what-does-network-switch-mean