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Figure 3-7 Pre-Divestiture connectivity.
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loop, in turn, connects to the local switch in the central office. This switch is the point at which customers first touch the telephone network, and it has the responsibility to perform the initial call setup, maintain the call while it is in progress, and tear it down when the call is complete. This switch is called a local switch because its primary responsibility is to set up local calls that originate and terminate within the same switch. It has one other responsibility, though, and that is to provide the necessary interface between the local switch and the long distance switch, so that calls between adjacent local switches (or between far-flung local switches) can be established. The process, then, goes something like this. When a customer lifts the handset and goes off-hook, a switch in the telephone closes, completing a circuit that enables a current flow, which in turn brings dial tone to the customer s ear. Upon hearing the dial tone, the customer enters the destination address of the call (otherwise known as a telephone number). The switch receives the telephone number and analyzes it, determining from the area code and prefix information whether the call can be completed within the local switch or if it must leave the local switch for another one. If the call is indeed local, it merely burrows through the crust of the switch and then reemerges at the receiving local loop. If the call is a toll or long-distance call, it must burrow through the hard crunchy coating of the switch, pass through the soft, chewy center, and emerge again on the other crunchy side on its way to a long-distance switch. Keep in mind that the local switch has no awareness of the existence of customers or
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telephony capability beyond its own cabinets. Thus, when it receives a telephone number that it is incapable of processing, it hands it off to a higher-order switch, with the implied message, Here, I have no idea what to do with this, but I assume that you do. The long-distance switch receives the number from the local switch, processes the call, establishes the necessary connection, and passes the call on to the remote long-distance switch over a long-distance circuit. The remote long-distance switch passes the call to the remote local switch, which rings the destination telephone, and ultimately the call is established. Please note that in this pre-divestiture example, the originating local loop, local switch, long-distance switch, remote local loop, and all of the interconnect hardware and wiring belong to AT&T. They are all manufactured by Western Electric, based on a set of internal manufacturing standards that, were there other manufacturers in the industry, would be considered proprietary. Because AT&T was the only game in town prior to divestiture, AT&T created the standard for transmission interfaces. Fast-forward now to January 1, 1984, and put yourself into the mind of Bill McGowan, whose company s very survival depended upon the successful implementation of Equal Access. Unfortunately, Equal Access had one very serious flaw. Keep in mind that because the post-1984 network was emerging from the darkness of monopoly control, all of the equipment that comprised the network infrastructure was bought at the proverbial company store and was, by the way, proprietary. Consider the newly recreated post-divestiture network model shown in Figure 3-8. At the local-switch level, precious little has changed; at this point in time, still only a single local services provider is available. At the long-distance level, however, a significant change takes place. Instead of a single long-distance service provider called AT&T, there are now three: AT&T, MCI, and Sprint. The competitive mandate of Equal Access was designed to guarantee that a customer could freely select their long-distance provider of choice. If they wanted to use MCI s service instead of AT&T s, a simple call to the local telephone company s service representative would result in the generation of a service order that would cause the customer s local service to be logically disconnected from AT&T and reconnected to MCI so that long-distance calls placed by the subscriber would automatically be handed off to MCI. The problem of equal access to customers for the three long-distance providers was solved. Since 1984, the telecommunications marketplace has continued to evolve, sometimes in strange and unpredictable ways. Harold Greene
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