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800 Number Portability, Local Number Portability (LNP), Line Information Database (LIDB) lookups for credit-card verification, and other enhanced features. In a sense, it makes the local switch s job easier by centralizing many of the functions that formerly had to be performed locally. The original concept behind SS7 was to separate the actual calls on the public telephone network from the process of setting up and tearing down those calls as a way to make the network more efficient. This had the effect of moving the intelligence out of the Public Switched Telephone Network (PSTN) and into a separate network where it could be somewhat centralized and therefore made available to a much broader population. The SS7 network, shown in Figure 3-14, consists of packet switches (Signal Transfer Points [STPs]) and intelligent database engines (Service Control Points [SCPs]) interconnected to each other, and to the actual telephone company switches (Service Switching Points [SSPs]) via high-speed digital links, typically operating at 56 to 64 Kbps. When a customer in an SS7 environment places a call, the following process takes place. The local switching infrastructure issues a software interrupt via the SSP so that the called and calling party information can be handed off to the SS7 network, specifically an STP. The STP in turn routes the information to an associated SCP, which performs a database lookup to determine whether any special call-handling instructions apply. For example, if the calling party has chosen to block the delivery of caller-ID information, the SCP database will ensure that this occurs. Once the SCP has performed its task, the call information is returned to the STP packet switch, which consults routing tables and then establishes a route for the call. Upon receipt of the call, the destination switch determines 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
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Figure 3-14 The SS7 network.
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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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busy condition or some other event, a packet will be returned to the source indicating the fact and SS7 will instruct the originating switch to put a 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 CLASSservices such as Automatic Ringback. With Automatic Ringback, the network monitors 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 any special call-handling requirements should be invoked, such as CLASS services, and instructs the various switches along the way to process the call as appropriate. These features comprise a set of services known as the Advanced Intelligent Network (AIN), a term coined by Telcordia (formerly Bellcore). 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 and to invoke supplementary or enhanced services.
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Network Topology
Before we enter the central office, we should pause to explain the topology of the typical network (see Figure 3-15). The customer s telephone and most likely his or her 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 3-16). 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 from electrical damage. 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 occurs between wire pairs packaged within the same cable. The number of twists per foot is carefully chosen. An example of twisted pair is shown in Figure 3-17.
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