What is the difference between dense wavelength division multiplexing and coarse wavelength division multiplexing?

use the textbook which i offered and some other materials and answer the questions blow: Page 146

7. How are a T-1 and SONET similar?

8. What are the main differences between statistical time division multiplexing and synchronous time division multiplexing?

13. What is the difference between dense wavelength division multiplexing and coarse wavelength division multiplexing?

15. How does code division multiplexing distinguish one signal from another?

16. What are the two basic forms of compression?

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