By Philip Golden, Hervé Dedieu, Krista S. Jacobsen
The electronic subscriber line (DSL) is increasing swiftly and a know-how as soon as regarded as basically transitional will quickly transparent $100 billion in overall annual provider profit. From the world’s top DSL specialists, Implementation and alertness of DSL applied sciences builds upon the speculation awarded in Fundamentals of DSL applied sciences to tackle concerns primary to the good fortune of DSL know-how, together with those who maintain DSL improvement, constraints, and demanding situations. This hugely sensible textual content friends into the blossoming sub-industries, all born of the DSL.
The editors lead with a dialogue on splitter circuits and micro-filters and proceed through addressing electronic chipsets and the services required to mix 'n match them with numerous different parts. on the grounds that trying out has turn into an in its personal, a number of chapters describe some of the different types of checking out important for carrier qualification, the evolution of trying out and provisioning of companies from undeniable outdated cellphone provider, loop qualification, and regulator’s decree of spectrum administration. The e-book offers sufficient insurance of DSM know-how and describes networks for a number of purposes in video, telephony, and net info parts and the linked community architectures. additionally, a piece on protection discusses packet move mechanism and voice-over DSL.
Offering an enormous array of knowledge no longer at present within the public area, Implementation and alertness of DSL Technologies presents a rigorous survey of DSL functions that illustrates the profound impression this expertise is having at the communications undefined. whilst mixed with Fundamentals of DSL Technology, this can be the main accomplished and authoritative resource of data on DSL.
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Additional resources for Implementation and applications of DSL technology
Another problem for the designer is the amount of code that must be developed; most methods use gradient techniques or second-order derivatives when using quasi-Newton methods. One of the simplest methods of optimization that offers a good trade-off between extremely good capabilities to avoid local minima and simplicity of implementation is the simulated annealing method, which has been successfully used in many phases of circuit design. As its name suggests, the simulated annealing exploits an analogy between the way in which a metal cools and freezes into a minimum energy crystalline structure (the annealing process) and the search for parameters which offer a minimum for a cost function.
22 Insertion loss in ADSL band. For ETSI TS 101 952-1-1 option B the insertion loss has to be greater than 55 dB on the band 32–1100 kHz. 2007 05:35pm 38 Implementation and Applications of DSL Technology The two constraints on the deviation of the insertion loss in passband can be expressed as gi (θ) = max |ILi−2 (θ , f ) − ILi−2 (θ , 1000 Hz)| − 1 , i = 7, . . 22 is deﬁned as IL9 (θ , f ). The ninth constraint can be expressed as g9 (θ) = max 55 − IL9 (θ , f ) , i = 1, . . , 4 f∈W where W = [32 kHz, 1100 kHz] One possible solution for the implementation of the simulated annealing algorithm is to introduce a cost function C(θ ) suited for the minimax optimization of the form minimize C(θ ) = max wi gi (θ ) 1≤i≤9 where wi are weights which compensate for the disparities of the different gi ranges.
21. • One additional constraint is the level of rejection in the ADSL band that in option A should be above 55 dB between 200 Hz and 4 kHz. 22. Once the constraints are deﬁned, the cost function that is to be minimized remains to be deﬁned. There is a slight difﬁculty here with respect to the general constrained optimization framework that has been presented previously; the simulated annealing is more suited for nonconstrained optimizations. Therefore, the constraints have to be cast into the cost function.
Implementation and applications of DSL technology by Philip Golden, Hervé Dedieu, Krista S. Jacobsen