What causes propagation delay?

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Tags

1. #arrival
2. #refers
3. #delay
4. #departure
5. #logic
6. #propagation
7. #input
8. #destination
9. #digital
10. #communications
11. #output
12. #system
13. #source
14. #signal
15. #required
16. #travel
17. #between
18. #symbolized