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Other Important Organizations
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In addition to the formal standards bodies, some industry groups are worth paying attention to. Some of them, like the United States Telecom Association (USTA) and the National Telecommunications and Information Administration (NTIA), are trade organizations that promote the
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First Things First
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efficient and effective operation of the industry. Others, like the Cellular Telecommunications and Internet Association (CTIA), focus on specific sectors of the marketplace. Still others, like SuperComm, are industry groups that sponsor annual trade shows where vendors gather to display their wares. These shows are worth attending, particularly if you are running low on keychains, T-shirts, and pens (only kidding). There are also technology specific groups that focus specifically on optical, wireless, component, switching, ATM, and so on. All are reachable online; depending on the nature of your interest in the industry, they are worth contacting.
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The Network
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For years now, communications networks have been functionally depicted as shown in Figure 1-5: a big, fluffy, opaque cloud into which disappear lines representing circuits that magically reappear on the other side of the cloud. I m not sure why we use clouds to represent networks; knowing what I know about their complex innards and how they work, a hairball would be a far more accurate representation. In truth, clouds are pretty good representations of networks from the point of view of the customers who use them. Internally, networks are remarkably complex assemblages of hardware and software, as you will see in the chapter on telephony. Functionally, however, they are straightforward: Customer traffic goes into the network on the Gozinta; the traf-
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Figure 1-5 The network cloud
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First Things First
First Things First
fic then emerges, unchanged, on the Gozouta. How it happens is unimportant to the customer; all he or she cares about or wants to care about is that the network receives, interprets, transports, and delivers his or her voice/video/images/data/music to the destination in a correct, timely, and cost-effective fashion. Later in the book we will discuss the various technologies that live within the network, but for now suffice it to say that its responsibilities fall into two categories: access and transport, as illustrated in Figure 1-6.
Network Access
As the illustration shows, network access is exactly that: the collection of technologies that support connectivity between the customer and the transport resources of the network. At its most common level, access is the local loop the (typically) two-wire circuit that connects a customer s telephone to the local switch, which 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 (DSL) is also a local loop-based service, but offers even more diverse service than ISDN in the areas where it is available. Cable
Figure 1-6 Access vs. transport regions of the network
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First Things First
1
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 Wi-Fi, WiMAX, LMDS, MMDS, satellite, cellular, microwave, and others represent alternative options 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, beginning with 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. The relationship between these network elements is shown in Figure 1-7. 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, smell, taste, and feel like a telephone to the network. For example, if the DTE is a PC, then 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 (Figure 1-8) or the parallel wires etched into the motherboard inside the PC (Figure 1-9). 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 singlefile transport of multiple bits, one after the other, usually deployed outside a computer.
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