Why is it called dark fiber?

Related questions

1. What is the difference between fiber and dark fiber?
2. What are the disadvantages of Fibre optic cable?
3. What is a CWDM mux?
4. What is DWDM network?
5. What is DWDM and CWDM?
6. What is dark fiber network?
7. What is channel spacing in DWDM?
8. What is the maximum distance for fiber optic cable?
9. What is dark fiber and lit fiber?

Tags

1. #communications
2. #advantage
3. #taken
4. #common
5. #unlit
6. #fiber
7. #unused
8. #active
9. #currently
10. #telecom
11. #black
12. #known
13. #should
14. #optical
15. #network
16. #rather