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Telecommunication Networks

Telecommunication Networks. What is Telecom ?. Telecommunication is the assisted transmission of signals over a distance for the purpose of communication. It is the technology of transferring information over a distance. Information. Information can be of several type: Audio – Telephone

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Telecommunication Networks

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  1. Telecommunication Networks

  2. What is Telecom ? Telecommunication is the assisted transmission of signals over a distance for the purpose of communication. It is the technology of transferring information over a distance.

  3. Information • Information can be of several type: • Audio – Telephone • Text - Telegraph , email, SMS • Pictures – Picture attachments • Video – Clipping over internet • Data – ATM to bank. • The same telecom technology/service cannot communicate all the types of information.

  4. Thrust areas in Telecom • Customer premises equipment. • Access • Network • Transmission • Switching • Computerization

  5. Subscriber Line (2W) Subscriber Line (2W) Inter-Exchange Junction Telephone Exchanges Communication – Fixed Lines

  6. Inter-Exchange Junction Subscriber Line (2W) BSC BTS MS Telephone Exchange Mobile Switching Centre (MSC) Communication - Mobile

  7. Sub Access Network Drop wire DP CABINET PILLARS DP DP MDF Primary Secondary DP Distribution

  8. .. NETWORK DIAGRAM OF CDMA / WLL SYSTEM 2 Mbps DIGITAL LINK BTS 2 Mbps DIGITAL LINK 2 Mbps DIGITAL LINK FWT Telecom Network BSC ( V5.2 OR R2/NO.7 ) FAX PSTN MS BTS BSC : Base Station Controller MSC : Mobile Switching Centre FWT : Fixed Wireless Terminal at subscriber premises. MS : Mobile Station

  9. PSTN/ISDN PLMN IP Networks Today Separate Service Networks Services Separate Access Transport & Switching Networks

  10. PSTN model Vs NGN model • Dedicated Network per service • Large Invest • Multiple technologies / Knowledge • Convergence technologies • Cost reduction • One Protocol, one Knowledge Video Video Storage Voice Storage Data voice Data VideoNetwork StorageNetwork IPNetwork IPNetwork (for Voice, Data & Video) Voice Network

  11. PSTN model Vs NGN model • Dedicated Network per service • Large Invest • Multiple technologies / Knowledge • Convergence technologies • Cost reduction • One Protocol, one Knowledge Video Video Storage Voice Storage Data voice Data VideoNetwork StorageNetwork IPNetwork IPNetwork (for Voice, Data & Video) Voice Network

  12. One network for everything Transition to NGN: Third wave Today Tomorrow Internet Telephone network IP-Network Mobile radio network • Multimedia Access - Advantages: • easy to handle • reliable • mobile

  13. Outdoor Plant

  14. Purpose of External Plant • To provide connectivity between CPE & Switch. Advantages of copper over wireless. • Dedicated channel for each customer • More bandwidth than wireless.

  15. A Typical Public Switched Telephone Network Signaling and Switching system Local Loop

  16. Outdoor Plant Schematic Pictureork MDF Exchange Side MDF Line Side DP TAG No PILLARS DP E Pillar 125 BOX X C H A N G E EXCG Equip No. Drop-Pair CPE PILLARS IN PILLARS OUT Jumper Jumper MDF vertical-> Pillar In(hardwired), Pillar Out-> DP TAG No.(Hardwired)

  17. C-DOT Switch

  18. MDF (Main Distribution Frame)

  19. PILLAR Pillar/Cabinet

  20. DP (Distribution Point)

  21. Customer Premises Equipment

  22. Rosette Line Jack Unit (LJU)

  23. Types of Dialing Decadic or Pulse Dialing DTMF (Dual Tone Multi Frequency) or Tone dialing.

  24. DTMF

  25. Comparison of two types of dialing Decadic DTMF The interruption rate or the dialing rate is generally 10 Hz. Time taken for Decadic dialing varies with the digits dialed (for dialing '0' maximum time is required) On an average, it is possible to dial typically 0.8 digits/sec. Time taken to dial any digit is constant and it is possible to dial typically 7 digits/sec.. Thus, DTMF is almost 10 times faster.

  26. Electronic ringer Piezo electric transducer

  27. THE CLASSIFICATION OF UNDERGROUND CABLES Jelly Filled cable Paper Core Cable.

  28. Jelly Filled Telephone Cables • Conductor: Solid plain anneated high conductivity copper wire of nominal diameter 0.32, 0.4, 0.50, 0.63, 0.90 mm • Insulation: Solid or Foam skin extruded polyethylene insulation grade stabilized. 100 % vergin material and colored as per requirement. • Pair: Two insulated conductors of specified colors twisted together with pre-determined lay to form a pair. The cross talk is minimized.

  29. Thank 'u'

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