PSTN

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PSTN

  1. 1. PSTN By Amin Pathan (M.Tech, CSE)
  2. 2. What Is The PSTN? The Public Switch Telephone Network (PSTN) Is A Mesh Network Of Lines, Trunks, Switches, Etc. That Connects Customer Provided Equipment (CPE) Together To Allow The CPE To Communicate Together. The PSTN Was Originally Designed To Optimize The Transmission Of Voice Services.
  3. 3. Major Elements Of The PSTN CO Class 1 Switch PSTN CO Class 2 Switch Analog Loop Digital Interoffice Trunks CO Class 5 Switch Residence CPE Digital Loop PBX or KTS Office Bldg
  4. 4. The Four Major Elements Of The PSTN There Are Four Major Elements Of Today’s Public Switched Telephone Network (PSTN). Customer Premises Equipment (CPE) Access System Transport Signaling
  5. 5. Access System The Access Component Of The PSTN Provides Customers All Of The Wiring And Equipment For The Customer’s CPE To Be Connected To The Central Core Of The Public Switched Telephone Network. The Access System Includes Both Lines And Trunks And The Termination Equipment In The End Office. Access Lines And Trunks Along With The Telephone Poles, Conduits, Connector Boxes, Etc. Are Referred To As The Local Loop.
  6. 6. Central Office Termination Equipment Some Samples Of End Office Termination Equipment.
  7. 7. Access System – Residential Access Each Customer Circuit Is A Two-Wire Cable From The Customer Demarc Out To The First Cross Connection Box Class 5 Switch A & B – Cross Connection Pedestal Or Cross Connection Box
  8. 8. Transport Component Of The PSTN Transport Means Transmission – Taking Voice, Data, And Video Signals From One Subscriber’s Access Line And Delivering Them To Another Customer’s Access Line. The End-Office, Or Class 5 Central Office Is The Point Where All Customer Access Lines Connect. The Trunks Within The Transport Core Include A Wide Variety Of Transmission Speeds (e.g. T1, T3, OC-1, OC-12) And Transmission Media (e.g. Copper And Optical Fiber).
  9. 9. A Cell Call Placed To A Land-Based Phone Travels Through The PSTN CO Class 1 Switch Cellular User CO Class 2 Switch Digital Interoffice Trunks CO Class 5 Switch Radio Controller MTSO Analog Loop Residence CPE
  10. 10. Telephones, One Type Of CPE. Example Of Some Modern Telephones

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