In what order to study networks?

Question

Telephony

It is necessary to study the basics of the following topics in a month:

• IP networks
  
• axis models
  
• PDH and SDH
  
• IP telephony
  
• Radio communication
  

You can recommend a book or in what order to study the topics. It is also interesting to know whether these topics are best studied bit by bit from different sources or there is one source in which everything is explained in sequence.
At the moment, I studied the osi models on Wikipedia, a couple of articles and a podcast on pdh sdh , in which I learned in addition about SIP and Cloud PDX

Answer 1

Did you find a podcast, but there is no series of articles?)
https://linkmeup.ru/blog/11.html
+ youtube with the same title