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Background

Background. PSTN/SS7 networking IP networking ATM networking SONET networking WDM networking Telephony data model. Bidirectional DS0 circuit. PSTN. A T1 (1.5 Kbps) is a time-multiplexed signal of 24 DS0 (64 kbps)

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Background

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Presentation Transcript

  1. Background • PSTN/SS7 networking • IP networking • ATM networking • SONET networking • WDM networking • Telephony data model

  2. Bidirectional DS0 circuit PSTN • A T1 (1.5 Kbps) is a time-multiplexed signal of 24 DS0 (64 kbps) • A TDM switch maps bits arriving in one time slot to another time slot on an output port DS0 lines TDM Switch TDM Switch TDM Switch TDM Switch Trunks T1

  3. SS7 network architecture Databases (e.g. 800) TDM Switch TDM Switch A B STP STP F TDM Switch TDM Switch B C TDM Switch TDM Switch STP STP TDM Switch A TDM Switch STP: Signal Transfer Point: datagram router A-F: Types of signaling links Databases (e.g. 800)

  4. Switch STP IS U P MTP L3 MTP L2 MTP L1 SS7 protocol stack TCAP SCCP SCCP MTP L3 MTP L2 MTP L1 MTP L3-L1 Message Transfer Part Level 3 to Level 1 TCAP Transaction Capabilities Application Part SCCP Signaling Connection Control Part ISUP ISDN User Part

  5. MTP L3 Header SLS OPC DPC SLS Signaling link Selection DPC Destination Point Code Network Identifier Network Cluster Network Cluster Member OPC Originating Point Code 8 8 8 MTP L3 • Connectionless (datagram) NL protocol • Addressing scheme: point code (14 or 24 bits) MTP L2 Header ISUP or ISUP/SCCP or TCAP/SCCP 8 24 24

  6. SSP SSP Does MTP L3 packet forwarding Basic call setup (using ISUP) DTMF Signaling SSP ANM ANM RING ACM IAM ACM RESPONSE IAM STP IAM Initial Address Message ACM Address Complete Message ANM Answer Message SSP IAM

  7. 516-555-1278 Long distance carrier 516-555-1278 800-555-4400 800-555-4400 800-555-4400 Call setup with advanced services (using TCAP) SCP STP STP Local Carrier Local Carrier Switch Switch Long Distance SCP STP SCP STP Switch Switch ring Signaling links Voicetrunks 516-555-1278 STP: Signal Transfer Point SCP: Service Control Point

  8. IP protocol stack

  9. TCP

  10. UDP

  11. IP network routing protocols

  12. ATM protocol stack

  13. Types of AAL

  14. Service classes

  15. CAC

  16. Scheduling

  17. ATM addressing

  18. ATM signaling

  19. ATM network routing protocol

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