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Network Access
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As the illustration shows, network access is exactly that: the collection of technologies that support connectivity between the customer and the
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Figure 1-5 The network cloud.
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First Things First
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Transport
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Figure 1-6 Access vs. transport regions of the network.
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Access
Access
transport resources of the network. At its most common level, access is the local loop, the two-wire circuit that connects a customer s telephone to the local switch that provides telephony service to that customer. As the network has become more data-aware, other solutions have emerged that provide greater bandwidth as well as multiservice capability. ISDN, which uses the two-wire local loop, provides greater bandwidth than the traditional analog local loop through digitization and time-division multiplexing (both explained shortly). Digital Subscriber Line, or DSL, is also a local loop-based service, but offers even more diverse service than ISDN in the areas where it is available. Cable modem service, which does not use the telephony local loop, offers high downstream (toward the customer) bandwidth and smaller upstream (from the customer) capacity. Wireless services, including LMDS, MMDS, satellite, cellular, and others, represent another option for access connectivity. All of these will be discussed in greater detail later in the book. Miscellaneous Additional Terms A number of other terms need to be introduced here as well, the first of which are Data Terminal Equipment (DTE) and Data Circuit Terminating Equipment (DCE). DTE is exactly that it is the device that a user employs to gain access to the network. A DCE is the device that actually terminates the circuit at the customer s premises, typically a modem. One important point: because the bulk of the usage is over the Public Switched Telephone Network (PSTN), which is optimized for the transport of voice, the primary role of the DCE is to make the customer s DTE look and smell and taste and feel like a telephone to the network. For example, if the DTE is a PC, then
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First Things First
First Things First
the modem s job is to collect the high-frequency digital signals being produced by the PC and modulate them into a range of frequencies that are acceptable to the bandwidth-limited voiceband of the telephone network. That s where the name comes from, incidentally modulate/demodulate (mo-dem). Another pair of terms that must be introduced here is parallel and serial. You have undoubtedly seen the ribbon cables that are used to transport data inside a PC, or the parallel wires etched into the motherboard inside the PC. These parallel conductors are called a bus, and are used for the high-speed transport of multiple simultaneous bits in parallel fashion from one device inside the computer to another. Serial transmission, on the other hand, is used for the single-file transport of multiple bits, one after the other, usually deployed outside a computer. Finally, we offer simplex, half-duplex, and full-duplex transmission. Simplex transmission means one-way only, like a radio broadcast. Halfduplex transmission means two-way, but only one way at a time, like CB radio. Finally, full-duplex means two-way simultaneous transmission, like telephony or two-way data transmission.
Network Transport
The fabric of the network cloud is a rich and unbelievably complex collection of hardware and software that moves customer traffic from an ingress point to an egress point, essentially anywhere in the world. It s a function that we take entirely for granted because it is so ingrained in day-to-day life, but stop for a moment to think about what the network actually does. Not only does it deliver voice and data traffic between end points, but it does so easily and seamlessly, with various levels of service quality as required to any point on the globe (and in fact beyond) in a matter of seconds and with zero human involvement. It is the largest fully automated machine on the planet and represents one of the greatest technological accomplishments of all time. Think about that: I can pick up a handset here in Vermont, dial a handful of numbers, and seconds later a telephone rings in Ouagadougou, Burkina Faso, in North Central Africa. How that happens borders on the miraculous. We will explore it in considerably greater detail later in the book. Transport technologies within the network cloud fall into two categories: fixed transport and switched transport. Fixed transport, sometimes called private line or dedicated facilities, includes such technologies as T-1, E-1, DS-3, SONET, SDH, dedicated optical channels,
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