Chapter 2: Physical Layer
Guide
This series of blog posts belongs to the mind map series. The textbook is a 5-day practice book for network planning designers (Zhu Xiaoping Shi You). Through mind maps, it is convenient for candidates to remember and understand the relevance of knowledge points. It is necessary to understand the knowledge points in depth. Read the original book for 5 days to practice network planners. The second knowledge point of the third article is the digital transmission system. The author's knowledge level is limited and there are mistakes and omissions. I hope to point out, thank you.
2.2 Digital Transmission System
2.2.1 Pulse code modulation PCM system
2.2.2 Synchronous optical network
2.2.3 Synchronous digital series
