By XiPeng Xiao
This booklet offers a accomplished exam of web QoS thought, criteria, seller implementation and community deployment from the practitioner's viewpoint, together with vast dialogue of comparable monetary and regulatory matters. Written in a technology-light means in order that quite a few execs and researchers within the info and networking industries can simply grab the fabric. comprises case reports according to real-world reviews from undefined. the writer begins by way of discussing the commercial, regulatory and technical demanding situations of the present QoS version. Key insurance contains defining a transparent enterprise version for promoting and purchasing QoS with regards to present and destiny course of presidency legislation and QoS interoperability (or lack thereof) among providers and networking units. the writer then demonstrates tips to increase the present QoS version to create a transparent promoting aspect, much less law uncertainty, and better probability of deployment luck. This comprises dialogue of QoS re-packaging to end-users; monetary and regulatory advantages of the re-packaging; and the final merits of a more robust technical strategy. ultimately, the writer discusses the long run evolution of QoS from a web philosophy point of view and shall we the reader draw the conclusions.This ebook is the 1st QoS ebook to supply intensive assurance at the advertisement and regulatory elements of QoS, as well as the technical point. From that, readers can snatch the industrial and regulatory problems with QoS and their implications at the total QoS company version. This e-book can also be the 1st QoS booklet to supply case reports of actual global QoS deployments, contributed through the folk who did the particular deployments. From that, readers can seize the sensible problems with QoS in actual international. This booklet is usually the 1st QoS ebook to hide either wireline QoS and instant QoS. Readers can grab the QoS matters within the instant global. The ebook used to be reviewed and recommended through a protracted record of in demand business and educational figures. * the single ebook to debate QoS know-how on the subject of financial and regulatory concerns * contains case stories in response to real-world examples from practitioners.* presents special perception into find out how to increase the present QoS version to create a transparent promoting aspect, much less regulatory uncertainty, and better likelihood of deployment good fortune.
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Additional info for Technical, Commercial and Regulatory Challenges of QoS: An Internet Service Model Perspective (The Morgan Kaufmann Series in Networking)
Example text
This again points out that to reduce delay variation, increasing speed of the bottleneck links, which are usually the access links, is the most effective approach. 27 28 CHAPTER 2 What Is QoS? Another point to note in the maximum delay and delay variation calculations above is two low-speed access links are assumed, one at each end. This is applicable for consumerto-consumer communications and possibly consumer-to-small-business communications. If one of the communicating parties has a higher-speed access link, then one low-speed access link will be replaced by one high-speed access link, and the end-to-end delay and delay variation will be reduced by about 10 ms each.
Largest packet size is 1500 bytes, and VoIP packet size is 200 bytes. 1541] Class 1 requirement, but network delay variation doesn’t. But again note that the delay variation value is the worst-case value. With so many (24) hops in between, the chance that all the delay variations would add up is extremely low. The endto-end delay variation is only 38 ms. The distribution of the end to end delay is shown in Table 2-6. 8% Therefore, the conclusion on how to improve QoS is the same: Increasing bottleneck link speed is the most effective approach.
In the networks, the potential bottlenecks are the DSLAM uplinks between the DSLAMs and the aggregation devices, the peering links between NSPs, and the 29 30 CHAPTER 2 What Is QoS? last-mile access links between the customers and the NSPs. Whether packet loss will happen or not in these links is governed by a complicated dynamics. This makes it likely for the bottleneck links to become saturated and drop packets. This could possibly cause packet loss as well. The bottleneck links could simply have high utilization but 0 percent packet loss.