Jntuk,vizianagaramdelhip,94413062721 B-ISDN and ATM.

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Presentation transcript:

Jntuk,vizianagaramdelhip, B-ISDN and ATM

Jntuk,vizianagaramdelhip., Characteristics of ATM Uses small, fixed-sized cell Connection oriented Bandwidth allocation on demand Supports multiple service types Applicable to LAN and WAN

Jntuk,vizianagaramdelhip., ATM Signaling UNI : User to Network Interface NNI : Network to Network Interface Different protocol in the different domain

Jntuk,vizianagaramdelhip., 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

Jntuk,vizianagaramdelhip., VP and VC Switching

Jntuk,vizianagaramdelhip., 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)

Jntuk,vizianagaramdelhip., Permanent Virtual Circuit Manual updates of VPI/VCI tables in network equipment

Jntuk,vizianagaramdelhip., Switched Virtual Curcuit Setup connection using UNI/NNI signaling

Jntuk,vizianagaramdelhip., ATM Reference Model Signaling ATM Adaptation Layer Q.2931, Q2971 SAAL ATM PHY SAAL

Jntuk,vizianagaramdelhip., 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)

Jntuk,vizianagaramdelhip., ATM Service Categories

Jntuk,vizianagaramdelhip., 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

Jntuk,vizianagaramdelhip., 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

Jntuk,vizianagaramdelhip., Traffic Management - III CLP(Cell Loss Priority) Control In Congestion state - EFCI(Explicit Forward Congestion Control) - CLP(Cell Loss Priority)

Jntuk,vizianagaramdelhip., Traffic Management – IV CAC / Connection Management UPC (Policing) CLP / EFCI control Frame Discard Traffic Shaping ABR Congestion Feedback

Jntuk,vizianagaramdelhip., ATM Signaling Protocol Point-to-Point ATM Connection(Q.2931)

Jntuk,vizianagaramdelhip., Reserved VPI/VCI Q.2931 Q.2971

Jntuk,vizianagaramdelhip., Message Structure Information ElementLength Protocol discriminatorDistinguish Message1 Call referenceIdentify call at the local UNI4 Message typeIdentify the function of message2 AAL parameter4-21 ATM traffic descriptor12-20 Broadband bearer capability 6-7 QoS parameter6 ………