What is PSTN in telecom?

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Tags

1. #circuit
2. #world
3. #providing
4. #operators
5. #public
6. #telecommunication
7. #switched
8. #operated
9. #local
10. #networks
11. #services
12. #aggregate
13. #national
14. #network
15. #telephony
16. #telephone
17. #regional
18. #infrastructure