Download ATM Network Performance by George Kesidis (auth.) PDF

By George Kesidis (auth.)

ATM community functionality, moment Edition, describes techniques to desktop and communique community administration on the ATM layer of the protocol hierarchy. the focal point is on pleasing quality-of-service necessities for person connections. leads to either parts of bandwidth scheduling and site visitors regulate are defined. fresh leads to end-to-end functionality, provisioning for video connections and statistical multiplexing also are defined. all the fabric has been up-to-date the place applicable and new references extra and elevated.
well timed updates:

  • Entirely new bankruptcy on ATM switches with an emphasis on scalable-to-terabit switching.
  • New fabric on round-robin scheduling, jitter keep watch over, QoS paradigms in addition to specified remedy of fluid modeling and variable bit expense channel means.
  • Expanded assurance of CBR channels, IP over ATM, and guaranteed-rate functionality.
  • Substantial elevate in end-of-chapter workouts. strategies for chosen workouts in separate appendix. entire recommendations for all workouts additionally to be had from author.

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0 Note that p = 1 implies that p. = -1. This is due to the fact that the PSN is cut-through while the reference queue, that generates the TFTs, is not (recall that each cell arriving to the reference queue is delayed by at least one unit of time). 2 Hierarchical Round-Robin (HRR) The bandwidth granularity of a round-robin scheduler is defined to be the minimum amount of bandwidth it can allocate to a particular queue. Clearly, the bandwidth granularity of WRR is 1-1 cells per unit time. One can attempt to improve the bandwidth granularity of WRR by increasing its frame size I.

Consequently, the maximum number of tokens that can be "consumed" by cells (that are transmitted through the leaky bucket) over interval I IS < Ts + p( t - s + 1) + 1 ~ 0" + p( t - s + 1) + 1. 11), the desired result. o The departure process from a FIFO queue has a similar shaping property as described in the following. 2 The cell departure process of a FIFO queue served at rate p cells per unit time is (1, p) constrained for all arrival times process es {ai}. Proof: Consider the departure process of the FIFO queue {Dn} and the arbitrary interval of time I as in the previous proof.

There is at most one departure from the PSN per unit time. By definition, a cell departs the nth queue at time m if and only if D~ = 1. , it may arrive and depart in the same unit oftime. This is the so-called "cut-through" implementation of a PSN. The performance consequences of non-cut-through implementations are easy G. Kesidis, ATM Network Performance © Kluwer Academic Publishers 2000 42 CHAPTER 3 FIFO I ~ Xl PI • • • ~ 1 cell per unit time XN FIFO N ~ PI best-effort cells + P2 + ... 1 A Processor Sharing Node to account for and are addressed in an exercise at the end of this chapter.

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