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A number of widely known network technologies are found at the Data Link Layer of the OSI Model. These include the access protocols used in modern local area networks, such Carrier Sense, Multiple Access with Collision Detection (CSMA/CD, used in Ethernet), and Token Ring. CSMA/CD is a protocol that relies on contention for access to the shared backbone over which all stations transmit, while Token Ring is more civilized stations take turns sharing access to the backbone. This is also the domain of frame relay and ATM technologies, which provide highspeed switching. Frame relay is a high-speed switching technology that has emerged as a good replacement for private line circuits. It offers a wide range of bandwidth and, while switched, delivers service quality that is equivalent to that provided by a dedicated facility. It is advantageous for the service provider to sell frame relay because it does not require the establishment of a dedicated circuit, thus making more efficient use of network resources. The only downsides of the technology are that it relies on variable-size frames, which can lead to variable delivery delay, and requires careful engineering to ensure that proper quality of service is delivered to the customer. Frame relay offers speeds ranging from 56K to DS3, and is widely deployed internationally. ATM has become one of the most important technologies in the service provider pantheon today, because it provides the ability to deliver true, dependable, and granular quality of service over a switched-network architecture; thus, it gives service providers the ability to aggregate mul-
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Protocols
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tiple traffic types on a single network fabric. This means that IP, which is a Network Layer protocol, can be transported across an ATM backbone, allowing for the smooth and service-driven migration to an all-IP network. Eventually, ATM s overhead-heavy quality-of-service capabilities will be replaced by more elegant solutions but, until that time comes, it still plays a central role in the delivery of service. We will discuss all of these services in later chapters.
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The Physical Layer
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Once the CRC is calculated and the frame is fully constructed, the Data Link Layer passes the frame down to the Physical Layer, the lowest layer in the networking food chain. This is the layer responsible for the physical transmission of bits, which it accomplishes in a wide variety of ways. The Physical Layer s job is to transmit the bits; this includes the proper representation of zeroes and ones, transmission speeds, and physicalconnector rules. For example, if the network is electrical, then what is the proper range of transmitted voltages required to identify whether the received entity is a zero or a one Is a one in an optical network represented as the presence of light or the absence of light Is a one represented in a copper-based system as a positive or as a negative voltage, or both Also, where is information transmitted and received For example, if pin 2 is identified as the transmit lead in a cable, which lead is data received over All of these physical parameters are designed to ensure that the individual bits are able to maintain their integrity and be recognized by the receiving equipment. Many transmission standards are found at the Physical Layer, including T1, E1, SONET, SDH, DWDM, and the many flavors of DSL. T1 and E1 are longtime standards that provide 1.544 and 2.048 Mbps of bandwidth respectively; they have been in existence since the early 1960s and occupy a central position in the typical network. SONET, the Synchronous Optical Network, and SDH, the Synchronous Digital Hierarchy, provide standards-based optical transmission at rates above those provided by the traditional carrier hierarchy. Dense Wavelength Division Multiplexing, or DWDM, is a frequency-division multiplexing technique that allows multiple wavelengths of light to be transmitted across a single fiber, providing massive bandwidth multiplication across the strand. It will be discussed in detail later in the chapter on optical networking. And DSL extends the useful life of the standard copper wire pair by
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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