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Chapter 9 ATM Networks

Chapter 9 ATM Networks. Chapter Figures. 48 bytes. 5 bytes. Header. Payload. Figure 9.1. Management plane. Plane management. Control plane. User plane. Layer management. Higher layers. Higher layers. ATM adaptation layer. ATM layer. Physical layer. Figure 9.2. Voice. AAL. A/D.

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Chapter 9 ATM Networks

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  1. Chapter 9ATM Networks Chapter Figures

  2. 48 bytes 5 bytes Header Payload Figure 9.1 Communication Networks

  3. Management plane Plane management Control plane User plane Layer management Higher layers Higher layers ATM adaptation layer ATM layer Physical layer Figure 9.2 Communication Networks

  4. Voice AAL A/D s1 , s2 … cells Digital voice samples Video Compression … AAL A/D cells compressed frames picture frames Data AAL cells Bursty variable-length packets Figure 9.3 Communication Networks

  5. User information User information AAL AAL ATM ATM ATM ATM PHY PHY PHY PHY … End system End system Network Figure 9.4 Communication Networks

  6. Private ATM network Private UNI X X Private NNI Public ATM network A Public UNI X X X NNI X Public UNI B-ICI Public ATM network B X Public UNI X X Figure 9.5 Communication Networks

  7. ATM layer Transmission convergence sublayer Physical layer Physical medium dependent sublayer Physical medium Figure 9.6 Communication Networks

  8. GFC (4 bits) VPI (4 bits) VPI (4 bits) VCI (4 bits) ATM cell header VCI (8 bits) CLP (1 bit) VCI (4 bits) PT (3 bits) HEC (8 bits) Payload (48 bytes) Figure 9.7 Communication Networks

  9. probability density  D0 Peak-to-Peak CDV Dmax Figure 9.8 Communication Networks

  10. Service Specific Convergence Sublayer Convergence Sublayer Common Part AAL Layer Segmentation and Reassembly Sublayer Figure 9.9 Communication Networks

  11. User data stream Higher layer … b1 b2 b3 Convergence sublayer CS PDUs 47 47 47 SAR PDUs SAR sublayer H H H 1 47 1 47 1 47 ATM Cells H H H ATM layer 5 48 5 48 5 48 Figure 9.10 Communication Networks

  12. (a) SAR PDU header SNP Seq. Count CSI 1 bit 3 bits 4 bits (b) CS PDU with pointer in structured data transfer 47 Bytes AAL 1 Pointer 46 Bytes 1 Byte Figure 9.11 Communication Networks

  13. AAL 2 Mobile switching office ATM cells Low bit rate Short voice packets Figure 9.12 Communication Networks

  14. This example assumes 24 byte packets Higher layer P3 P2 P1 Service specific convergence sublayer Assume null Common part convergence sublayer Add 3-byte header to each user packet H H H 3 24 3 24 3 24 SAR sublayer Segment into SAR PDUs PAD 1 47 1 47 H H ATM layer 5 48 5 48 Figure 9.13 Communication Networks

  15. (a) CPS packet structure CID (8 bits) PPT (2 bits) CPS packet header LI (6 bits) UUI (3 bits) HEC (5 bits) Payload Figure 9.14 – part 1 Communication Networks

  16. (b) ATM SDU Cell Header SN (1 bit) P (1 bit) Start field (STF) OSF (6 bits) CPS-PDU payload PAD Figure 9.14 – part 2 Communication Networks

  17. Higher layer Information User message Service specific convergence sublayer Assume null Pad message to multiple of 4 bytes. Add header and trailer. Common part convergence sublayer H Information T PAD 4 4 Each SAR-PDU consists of 2-byte header, 2-byte trailer, and 44-byte payload. SAR sublayer … 2 44 2 2 44 2 2 44 2 … ATM layer Figure 9.15 Communication Networks

  18. (a) CPCS-PDU format Trailer Header AL Etag Length CPI Btag BASize Pad CPCS - PDU Payload 1 1 2 1 - 65,535 0-3 1 1 2 (bytes) (bytes) (bytes) (b) SAR PDU format Trailer (2 bytes) Header (2 bytes) LI CRC ST SN MID SAR - PDU Payload 2 4 10 44 6 10 (bits) (bytes) (bits) Figure 9.16 Communication Networks

  19. Higher layer Assume two packets from different users P1 P2 Service specific convergence sublayer MID = b MID = a Common part convergence and SAR sublayers Each packet is segmented separately. SAR PDUs identified by MID. CPCS SAR CPCS SAR  SPDUA2 SPDUA1  SPDUB2 SPDUB1 Interleaver Cells from two packets are interleaved. Interleaved cells ATM layer Figure 9.17 Communication Networks

  20. Higher layer Information Service specific convergence sublayer Assume null Common part convergence sublayer Information T PAD SAR sublayer … 48 (0) 48 (0) 48 (1) … ATM layer PTI = 1 PTI = 0 PTI = 0 Figure 9.18 Communication Networks

  21. UU CPI Length CRC Pad Information 0 - 65,535 0-47 1 1 2 4 (bytes) (bytes) Figure 9.19 Communication Networks

  22. Signaling application Message Message SSCF maps SSCOP service to service required by SSCF user SSCF SSCS SSCOP identifies gaps in SDU sequence and requests retransmissions SSCOP Message T AAL 5 provides non-assured service CSCP and SAR of AAL 5 As per Figure 9.18 … ATM layer Figure 9.20 Communication Networks

  23. PL RSVD PDU SN Type Pad Information 0 - 65,535 0-3 2 2 4 24 (bytes) (bytes)(bits)(bits) (bits) (bits) Figure 9.21 Communication Networks

  24. (a) DCC ATM format 1 3 13 19 20 AFI DCC HO-DSP ESI SEL IDP DSP IDI (b) ICD ATM format 1 3 13 19 20 AFI ICD HO-DSP ESI SEL IDP DSP IDI (c) E.164 ATM format 1 9 13 19 20 AFI E.164 HO-DSP ESI SEL IDP DSP IDI Figure 9.22 Communication Networks

  25. UNI UNI Source Destination Network SETUP SETUP CALL PROCEEDING CALL PROCEEDING CONNECT CONNECT CONNECT ACK CONNECT ACK RELEASE RELEASE RELEASE COMPLETE RELEASE COMPLETE Figure 9.23 Communication Networks

  26. Network A Network B PNNI PNNI Figure 9.24 Communication Networks

  27. Source Switch Transit Switch Destination Switch Destination B Source A SETUP SETUP SETUP SETUP CALL PROCEEDING CALL PROCEEDING CALL PROCEEDING CALL PROCEEDING CONNECT CONNECT CONNECT CONNECT CONNECT ACK CONNECT ACK CONNECT ACK CONNECT ACK RELEASE RELEASE RELEASE RELEASE COMPLETE RELEASE RELEASE COMPLETE RELEASE COMPLETE RELEASE COMPLETE Figure 9.25 Communication Networks

  28. Logical Link A B Logical Group Node Peer Group Leader PG(A) A.2 A.1 PG(B) PG(A.2) PG(A.1) A.2.2 B.1 A.1.2 B.3 A.2.3 A.2.1 A.2.4 B.2 A.1.1 A.1.3 B.4 Physical Link Figure 9.26 Communication Networks

  29. A.2 B A.1.2 A.1.3 A.1.1 Figure 9.27 Communication Networks

  30. ATM network LIS4 LIS3 LIS5 LIS2 LIS6 LIS1 Router Router Router Router Router Figure 9.28 Communication Networks

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