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PSTN - Public Switched Telephone Network

Today my topic is Public Switched Telephone System, or PSTN. PSTN is a century-old worldwide connected telephone network. The PSTN topology and class level might be different in different countries but the original design was only for circuit switching analog telephone calls. Nowadays, the backbone of the PSTN is mostly digital, and most local loops are still using analog technologies. In terms of physical media, PSTN is a mix of copper wires, cables, fiber optics, and wireless. PSTN forms a basic foundation and a very important part in the infrastructure of WAN technologies. My topics are organized by playlists:    / sunnylearning   My most popular videos: https://www.youtube.com/user/sunnylea... Wireless and Wi-Fi    • CSMA/CA - Wireless Medium Access Cont...   Remote Access/WAN technologies    • Circuit Switching vs. Packet Switching   This is my education channel. My topics cover networking, security, programming, data structure, algorithm, programming and other computer-related materials. Please leave comments, questions and subscribe! Thank you very much! Sunny Classroom