Why is PDH better than SDH?

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Tags

  1. #digital
  2. #synchronous
  3. #everywhere
  4. #weaknesses
  5. #telecommunication
  6. #useful
  7. #replaced
  8. #equipment
  9. #sector
  10. #plesiochronous
  11. #transfer
  12. #abreviated
  13. #widely
  14. #hieratchy
  15. #hierarchy
  16. #earlier
  17. #while