PSTN Presentation.pdf - system Topicstobediscussed 1 2...

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7/25/2015 1 Introduction PSTN switching system Topics to be discussed 1. History of switching systems 2. PSTN switching system 3. Circuit switching and Packet switching 4. Signaling protocols used in PSTN 1. CCS and CAS 2. Line Signaling 3. R2 Signaling Basics 4. C7 signaling Basics History of Switching systems 1. Manual Board ( Telephone Operator Positions)- Manual 2. Strowger Switch- Mechanical (More) 3. Cross Bar Switch- Semi Electronics ( Mechanical+Electonics) 4. Digital ( TDM ) Switch- Fully Electronics ( Digital) 5. Soft switch ( NGN) - IP 6. IMS ( IP Multimedia Subsystem) - IP PSTN NGN 1.Manual Board ( Telephone Operator Positions) 2.Strowger Switch 3.Cross Bar Switch
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