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Figure 3-11 The SS7 network
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tions apply. For example, if the calling party has chosen to block the delivery of caller ID information, the SCP query will return that fact. Once the SCP has performed its task, the call information is returned to the STP packet switch, which consults routing tables and then selects a route for the call. Upon receipt of the call, the destination switch will cooperate with SS7 to determine whether the called party s phone is available, and if it is, it will ring the phone. If the customer s number is not available due to a busy condition or some other event, a packet will be returned to the source indicating the fact, and SS7 will instruct the originating SSP to put busy tone or reorder in the caller s ear. At this point, the calling party has several options, one of which is to invoke one of the many CLASS services such as automatic ringback. With automatic ringback, the network will monitor the called number for a period of time, waiting for the line to become available. As soon as it is, the call will be cut through, and the calling party will be notified of the incoming call via some kind of distinctive ringing. Thus, when a call is placed to a distant switch, the calling information is passed to SS7, which uses the caller s number, the called number, and SCP database information to choose a route for the call. It then determines whether there are any special call handling requirements to be invoked such as CLASS services, and instructs the various switches along the way to process the call as appropriate. These features are made up of a set of services known as the Advanced Intelligent Network (AIN), a term coined by Telcordia (formerly Bellcore, sold to Science Applications International Corporation, recently sold again to Providence Equity and Warburg Pincus). The SSPs (switches) are responsible for basic calling, while the SCPs manage the enhanced services that ride atop the calls. The SS7 network, then, is responsible for the signaling required to establish and tear down calls
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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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and to invoke supplementary or enhanced services. It is critically important, even more so today as the network begins the complex process of migrating from a circuit-switched model to a VoIP packet-based model. More on that later in the book.
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Before we enter the central office, we should pause to explain the topology of the typical network (please refer to Figure 3-9). The customer s telephone, and most likely, their PC and modem, are connected via house wiring (sometimes called inside wire) to a device on the outside of the house or office building called a protector block (see Figure 3-12). It is nothing more than a high-voltage protection device (a fuse, if you will) designed to open the circuit in the event of a lightning strike or the presence of some other high-voltage source. It protects both the subscriber and the switching equipment. The protector connects to the network via twisted pair wire. Twisted pair is literally that a pair of wires that have been twisted around each other to reduce the amount of crosstalk and interference that occur between wire pairs packaged within the same cable. The number of twists per foot is carefully chosen. The twisted pair(s) that provides service to the customer arrives at the house on what is called the drop wire. It is either aerial, as shown in
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