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 fifth knowledge point of the third article is the supplementary knowledge point. The author's knowledge level is limited and there are errors and omissions. I hope to point out, thank you.
2.5 Supplementary knowledge points
2.5.1 RS-232-C
2.5.2 Frame Relay
2.5.3 ATM
