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information about Cristina that it should invoke. The local switch routes the call over intraoffice facilities to a tandem switch, which in turn connects the call to the POP of whichever long-distance provider Cristina is subscribed. The long-distance carrier invokes the capabilities of SS7 to determine whether Adam s phone is available, and if it is, hands the call off to the remote local service provider. When Adam answers, the call is cut through and it progresses normally. There are, of course, other ways that calls can be routed. The local loop could be wireless, and if it is, the call from the cell phone is received by a cell tower (see Figure 3-37) and is transported to a special dedicated cellular switch in a central office called a Mobile Telephone Switching Office (MTSO). The MTSO processes the call and hands it off to the wireline network via interoffice facilities. From that point on the call is handled like any other. It is either terminated locally on the local switch or handed to a tandem switch for long-distance processing. The fact of the
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Figure 3-37 Cell tower
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matter is that the only part of a cellular network that is truly wireless is the local loop everything else is wired. Before we wrap this chapter, we should take a few minutes to discuss carrier systems, voice digitization, and multiplexed transport, all of which take place (for the most part) in the central office. In spite of all the hype out there about the Internet and IP magic, plain old telephone service (POTS) remains the cash cow in the industry. In these final sections we ll explain T- and E-Carrier, SONET, SDH, and voice digitization techniques.
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The original voice network, including access, transmission facilities, and switching components, was exclusively analog until 1962 when T-carrier emerged as an intra-office trunking scheme. The technology was originally introduced as a short-haul, four-wire facility to serve metropolitan areas and was a technology that customers would never have a reason to know about after all, what customer could ever need a meg-and-a-half of bandwidth Over the years, however, it evolved to include coaxial cable facilities, digital microwave systems, fiber, and satellite, and of course became a premier access technology that customers knew a great deal about. Consider the following scenario: A corporation builds a new headquarters facility in a new area just outside the city limits. The building will provide office space for approximately 2,000 employees, a considerable number. Those people will need telephones, computer data facilities, fax lines, videoconferencing circuits, and a variety of other forms of connectivity. The telephone company has two options that it can exercise to provide access to the building. It can make an assessment of the number of pairs of wire that the building will require and install them, or it can do the same assessment but provision the necessary bandwidth through carrier systems that transport multiple circuits over a shared facility. Obviously, this second option is the most cost-effective and is, in fact, the option that is most commonly used for these kinds of installations. This model should sound familiar: Earlier we discussed loop carrier systems and the fact that they reduce the cost of provisioning network access to far-flung neighborhoods. This is the same concept; instead of a residential neighborhood, we re provisioning a corporate neighborhood.
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