By Giovanni Giambene

This publication is aimed to supply a simple description of present networking applied sciences and protocols in addition to to supply vital instruments for community functionality research in keeping with queuing thought. the second one version provides chosen contents within the first a part of the booklet for what matters: (i) the token bucket regulator and site visitors shaping concerns; (ii) the TCP protocol congestion keep an eye on that has an important half in present networking; (iii) uncomplicated satellite tv for pc networking concerns; (iv) including information on QoS help in IP networks. The ebook is equipped in order that we've got first networking applied sciences and protocols (Part I) after which idea and workouts with purposes to the various applied sciences and protocols (Part II).
This booklet is meant as a textbook for grasp point classes in networking and telecommunications sectors.

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With the development of the Internet (IP-based traffic), QoS issues have also been addressed by IETF in RFC 2216, according to which QoS refers to “the nature of the packet delivery service provided, as described by parameters such as achieved bandwidth, packet delay, and packet loss rates”. 1541 Recommendation, where 8 QoS classes are envisaged, also detailing possible applications and queuing schemes to be adopted at nodes. 30 1 Introduction to Telecommunication Networks The Service Level Agreement (SLA) is a contract between the end-user and the service provider/operator, which defines suitable bounds for some of the QoS performance parameters described above.

The protocols from the physical level to the transport one are related to the network infrastructure and deal with telecommunication aspects from transmission, to error management, to routing, and, finally, to flow and congestion control, whereas protocols from layers 5–7 are mainly related to software elaboration aspects. ) implementing the OSI protocol stack. The generic layer X ∈ {1, 2,. , 7} is composed of functional 24 1 Introduction to Telecommunication Networks End system A End system B X-SAP Layer X+1 Primitives Primitives Interface X protocol Layer X Peer-to-peer equivalent collo quium based on packet headers Interface Layer X−1 X-entity X-entity Primitives Primitives (X−1)-SAP Fig.

The diameter of the core is different for different types of fibers: 8, 10 or 50 μm. Hundreds or thousands of these optical fibers are arranged in bundles in optical cables. The bundles are protected by the cable outer covering, called jacket. See Fig. 28. The difference in densities between core and cladding allows to exploit the principle of total internal reflection. As optical radiation passes through the fiber it is constantly reflected during the propagation through the center core of the fiber.

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