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Circuit switch telecommunication network

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Circuit switch telecommunication network

  1. 1. J.Tiberghien - VUBJ.Tiberghien - VUB Telecommunication s Concepts Chapter 2.1 The Circuit Switched Telephone Network
  2. 2. J.Tiberghien - VUBJ.Tiberghien - VUB Conten ts • The traditional Telephone Network –Overall structure –Trunk lines »Plesiochronous Data Hierarchy »Synchronous Data Hierarchy –Exchanges and signaling –General purpose SDH networks
  3. 3. J.Tiberghien - VUBJ.Tiberghien - VUB Conten ts • The traditional Telephone Network –Overall structure –Trunk lines »Plesiochronous Data Hierarchy »Synchronous Data Hierarchy –Exchanges and signaling –General purpose SDH networks
  4. 4. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone Network PABX SW SW SW SW SW PABX SW SW Analog / Digital
  5. 5. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone Network Some details : Analog telephones on analog switch twisted pair, average length 2.5 Km Line circuit Analog switch
  6. 6. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone Network Some details : Analog telephone on digital switch twisted pair, average length 2.5 Km Line circuit Digital switch Digital Analog
  7. 7. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone Network Some details : ISDN Basic Access twisted pair, average length 2.5 Km 144Kb/s modem Digital switch 144Kb/s modem S bus 2 * 64 Kb/s + 16 Kb/s
  8. 8. J.Tiberghien - VUBJ.Tiberghien - VUB Conten ts • The traditional Telephone Network –Overall structure –Trunk lines »Plesiochronous Data Hierarchy »Synchronous Data Hierarchy –Exchanges and signaling –General purpose SDH networks
  9. 9. J.Tiberghien - VUBJ.Tiberghien - VUB Time Domain Multiplexing 1 0 0 1 0 1 0 1 1 0 0 10 1 0 1 Synchronous multiplexing
  10. 10. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone Network Trunk Network (CEPT30) Optical Fiber or Microwave Link Digital switch Digital switch n*30*64 Kb/s n*2048 Kb/s
  11. 11. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone Network Trunk Network (Bell D2) Digital switch Digital switch n*23*64 Kb/s n* 1544 Kb/s Optical Fiber or Microwave Link
  12. 12. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone Network Some details : ISDN Primary Rate Digital switch 2048 Kb/s (CEPT30) Optical Fiber or Microwave Link PABX
  13. 13. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone Network Trunk Network Optical Fiber or Microwave Link n*30*64 Kb/s n*2048 Kb/s Analog switch Analog Digital
  14. 14. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone Network Trunk Network Digital switch Digital switch Optical Fiber or Microwave Link
  15. 15. J.Tiberghien - VUBJ.Tiberghien - VUB Conten ts • The traditional Telephone Network –Overall structure –Trunk lines »Plesiochronous Data Hierarchy »Synchronous Data Hierarchy –Exchanges and signaling –General purpose SDH networks
  16. 16. J.Tiberghien - VUBJ.Tiberghien - VUB Synchronous Multiplexing of almost synchronous data flows D C B AE S R Q PT F EST D C B AR Q P01F 1 Frame S C fout > n * MAX(fin)
  17. 17. J.Tiberghien - VUBJ.Tiberghien - VUB Plesiochronous Digital Hierarchy– Each multiplexed section has its own clock – Each level of multiplexing has its own clock – Frame structure from multiplexed signals is not explicitly present in the multiplexed stream > Full demultiplexing required at each node !
  18. 18. J.Tiberghien - VUBJ.Tiberghien - VUB Conten ts • The traditional Telephone Network –Overall structure –Trunk lines »Plesiochronous Data Hierarchy »Synchronous Data Hierarchy –Exchanges and signaling –General purpose SDH networks
  19. 19. J.Tiberghien - VUBJ.Tiberghien - VUB Synchronous Digital Hierarchy STM-1 STM-1 Up to 63 channels at 2 Mb/s – The entire trunk network has one clock – Multiplexed stream based on 125 µS frames – Different channels can each have their own asynchronous clock. – Add-drop multiplexers
  20. 20. J.Tiberghien - VUBJ.Tiberghien - VUB Synchronous Digital Hierarchy SDH - SONET Data rate CCITT USA-Elec. USA-Opt. 51.84 STS-1 OC-1 155.52 STM-1 STS-3 OC-3 466.56 STM-3 STS-9 OC-9 622.08 STM-4 STS-12 OC-12 933.12 STM-6 STS-18 OC-18 1244.16 STM-8 STS-24 OC-24 1866.24 STM-12 STS-36 OC-36 2488.32 STM-16 STS-48 OC-48
  21. 21. J.Tiberghien - VUBJ.Tiberghien - VUB SDH Rings 34 Mb/s 2 Mb/s
  22. 22. J.Tiberghien - VUBJ.Tiberghien - VUB SDH Rings
  23. 23. J.Tiberghien - VUBJ.Tiberghien - VUB SDH Rings
  24. 24. J.Tiberghien - VUBJ.Tiberghien - VUB SDH Rings The Worldcom Belgian Network 065 060 064 071 057 069 056 051 058 059 050 068 055 054 053 067 02 09 052 03 061 082 084 083 085 063 086 080 010 081 016 019 011 015 014 04 012 087 089013 WCOMPOP WCOMPOP WCOMPOP WCOMPOP WCOMPOP WCOMPOP WCOMPOP WCOMPOP WCOMPOP WCOMPOP LUXEMBOURG
  25. 25. J.Tiberghien - VUBJ.Tiberghien - VUB SDH Rings CUT !
  26. 26. J.Tiberghien - VUBJ.Tiberghien - VUB Conten ts • The traditional Telephone Network –Overall structure –Trunk lines »Plesiochronous Data Hierarchy »Synchronous Data Hierarchy –Exchanges and signaling –General purpose SDH networks
  27. 27. J.Tiberghien - VUBJ.Tiberghien - VUB Telephone Exchange (Conceptual Model) Switching Matrix Line Circuit Line Circuit Line Circuit Line Circuit Line Circuit Control Computer trunk lines + Inter-office signaling Register Register Register Register
  28. 28. J.Tiberghien - VUBJ.Tiberghien - VUB Signaling system generations• SS1 - SS5 : Analog call forwarding between exchanges • SS6 : First digital signaling system – monolithic communications system (no layers) – Full mesh of virtual circuits, based on 2400 b/s links • SS7 : Signaling system for the intelligent network – uses any digital links, satellites included – layered, OSI inspired, network architecture – supports "intelligent network" applications » Non-geographic numbers (800) » CLIP, Call forwarding, Conference calls, etc... » Number portability » Carrier selection » Mobility & roaming • IP ???
  29. 29. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone Network 629 62X 477 538 64X 643 673 Non-geographic Numbering 6234567 6292905 6433180 0800 12345 4776970 6736476 database 0800
  30. 30. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone NetworkNumber portability Ported numbers
  31. 31. J.Tiberghien - VUBJ.Tiberghien - VUB The Telephone NetworkCarrier selection • through prefix • through preselection
  32. 32. J.Tiberghien - VUBJ.Tiberghien - VUB Conten ts • The traditional Telephone Network –Overall structure –Trunk lines »Plesiochronous Data Hierarchy »Synchronous Data Hierarchy –Exchanges and signaling • General purpose SDH networks
  33. 33. J.Tiberghien - VUBJ.Tiberghien - VUB General Purpose SDH Networks PABX PABX
  34. 34. J.Tiberghien - VUBJ.Tiberghien - VUB Bibliography To know More about Telephony Recommended for this chapter John BELLAMY Digital Telephony Second edition John Wiley, 1991. ISBN : 0-471-62056-4
  35. 35. J.Tiberghien - VUBJ.Tiberghien - VUB Bibliography To know More about SDH Recommended for this chapter Mike SEXTON, Andy REID Transmission Networking: SONET and the Synchronous Digital Hierarchy Artech House, 1992. ISBN : 0-89006-551-9

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