STM4

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=tN2DNuhDFGM

The STM-4 is a SDH ITU-T fiber optic network transmission standard. It has a bit rate of 622.080 Mbit/s. • The STM-4 specification is designed to carry 7,680 8-bit voice frames every 125 micro-seconds for a total payload bit rate of 491.520 Mbit/s. The other levels defined by the SDH standard are STM-1, STM-16 and STM-64. Beyond this we have wavelength-division multiplexing commonly used in submarine cabling. • • This video is targeted to blind users. • Attribution: • Article text available under CC-BY-SA • Creative Commons image source in 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