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B-ISDN and ATM ( 보충 )

B-ISDN and ATM ( 보충 ). 발표자 : 박종민 jmpark@cs.chonbuk.ac.kr. Reference Site. http://myhome.netsgo.com/hl3qvh/ho/ppt/q2931 http://home.yeojoo.ac.kr/~dwhyun/atm. Characteristics of ATM. Uses small, fixed-sized cell Connection oriented Bandwidth allocation on demand

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B-ISDN and ATM ( 보충 )

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  1. B-ISDN and ATM (보충) 발표자 : 박종민 jmpark@cs.chonbuk.ac.kr B-ISDN and ATM (보충)

  2. Reference Site • http://myhome.netsgo.com/hl3qvh/ho/ppt/q2931 • http://home.yeojoo.ac.kr/~dwhyun/atm B-ISDN and ATM (보충)

  3. Characteristics of ATM • Uses small, fixed-sized cell • Connection oriented • Bandwidth allocation on demand • Supports multiple service types • Applicable to LAN and WAN B-ISDN and ATM (보충)

  4. ATM Signaling • UNI : User to Network Interface • NNI : Network to Network Interface • Different protocol in the different domain B-ISDN and ATM (보충)

  5. Virtual Path / Virtual Channel • Connection Identifier : VPI/VCI • Physical Link : Contains multiple VPs • Virtual Path : Contains multiple VCs • Virtual Channel : Logical path between ATM endpoint B-ISDN and ATM (보충)

  6. VP and VC Switching B-ISDN and ATM (보충)

  7. ATM Cell Header • PTI Payload Type Identifier(3 Bits) • - 1 bit : User/Control Data. - 2 bit : Congestion flag.- 3 bit : Last Cell flag • CLP Cell Loss Priority Bit • HEC Header Error Check(8 Bits) B-ISDN and ATM (보충)

  8. Permanent Virtual Circuit • Manual updates of VPI/VCI tables in network equipment B-ISDN and ATM (보충)

  9. Switched Virtual Curcuit • Setup connection using UNI/NNI signaling B-ISDN and ATM (보충)

  10. ATM Reference Model SAAL Signaling ATM Adaptation Layer B-ISDN and ATM (보충)

  11. ATM Service Criteria • Traffic parameters • Peak Cell Rate(PCR), Sustainable Cell Rate(SCR) • Maximum Burst Size(MBS), Minimum Cell Rate(MCR) • Quality of Service • Maximum Cell Transfer Delay(MCTD) • Cell Delay Variation Tolerance(CDVT) • Cell Loss Ratio(CLR) B-ISDN and ATM (보충)

  12. ATM Service Categories B-ISDN and ATM (보충)

  13. Traffic Management - I • CAC(Connection Admission Control) • Determine whether a connection can be progressed or not - satisfy the traffic contract of the connection- not disturb traffic contracts of the other connections B-ISDN and ATM (보충)

  14. Traffic Management - II • UPC(Usage Parameter Control) • Protect network resources from malicious as well as unintentional misbehavior- based on traffic contract of the connection- action : cell discard, cell tagging B-ISDN and ATM (보충)

  15. Traffic Management - III • CLP(Cell Loss Priority) Control • In Congestion state- EFCI(Explicit Forward Congestion Control) - CLP(Cell Loss Priority) B-ISDN and ATM (보충)

  16. Traffic Management – IV • CAC / Connection Management • UPC (Policing) • CLP / EFCI control • Frame Discard • Traffic Shaping • ABR Congestion Feedback B-ISDN and ATM (보충)

  17. ATM Signaling Protocol • Point-to-Point ATM Connection(Q.2931) B-ISDN and ATM (보충)

  18. Reserved VPI/VCI Q.2971 Q.2931 B-ISDN and ATM (보충)

  19. Message Structure B-ISDN and ATM (보충)

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