Before revision: PDH signals Eight-to-Fourteen Modulation 4B5B 8b/10b encoding HDLC Modified Frequency Modulation Anisochronous Morse code Asynchronous start-stop Most of these codes can be seen as a kind of Run Length Limited code.
After revision: PDH signals Eight-to-Fourteen Modulation 4B5B 8b/10b encoding HDLC Modified Frequency Modulation Asynchronous Morse code Asynchronous start-stop Most of these codes can be seen as a kind of Run Length Limited code.