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carefully you can hear them) that are slightly dissonant. This is done to prevent the possibility of a human voice randomly generating a frequency that could cause a misdial. The tone pairs, shown in Figure 3-12, are carefully selected such that they could not be generated by the human voice. This technique is called Dual Tone Multi-Frequency (DTMF). It is not, however, the only way. You may have noticed a switch on many phones with two positions labeled TONE and PULSE (see Figure 3-13). When the switch is set to the TONE position, the phone generates DTMF. When it is set on PULSE, it generates the series of clicks that old dial telephones made when they were used to place a call2. When the dial was rotated, let s say to the number three, it caused a switch contact to open and close rapidly three times, sending a series of three electrical pulses (or more correctly, interruptions) to the switch. DTMF has been around since the 1970s, but switches are still capable of being triggered by pulse dialing. Want to impress your friends Try pulse dialing on a DTMF telephone. Simply find a phone that has a real button or buttons that you can push down to hang up the phone. Pick up the handset, and then dial the number you want to call by rapidly pushing and releasing the buttons the
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Figure 3-12 DTMF tone pairings.
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2 About eight years ago, I took a trip to Seattle to teach a class, and my family accompanied me. One evening while strolling along Pike Street we came upon a bank of modern pay phones, all of which had dials instead of DTMF buttons. My kids, still little back then, begged me for quarters so that they could call their friends on those cool new phones.
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Telephony
Figure 3-13 Pulse/Tone switch on telephone.
3
appropriate number of times, leaving a second or two of delay between each dialed digit. It takes a little practice, but it really does work. Try something simple like Information (411) first. Back to our example. Cristina finishes dialing Adam s number and a digits collector in the switch receives the digits. The switch then performs a rudimentary analysis of the number to determine whether it is served out of the same switch. It does this by looking at the area code (Numbering Plan Area [NPA]) and prefix (NXX) of the dialed number. A telephone number is comprised of three sections: 505 - 555 - 7837 The first three digits are the NPA, which identifies the called region. For example, I live in Vermont where the entire state is served by a single NPA, 802. Other states, such as California, have a dozen or more NPAs to serve its much denser population base. The second three digits are the NXX, which identifies the exchange that the number is served from, and by extension the switch to which the number is connected. Each NXX can serve 10,000 numbers (555-0000 through 555-9999). Remember the New York fire Twelve exchanges were lost, under which 104,000 subscribers were operating (out of a possible 120,000). A modern central office switch can typically handle as many as 15 to 20 exchanges of 10,000 lines each. In our example, Adam is served out of a different switch than Cristina, so the call must be routed to a different central office. Before that routing can take place, however, Cristina s local switch routes a query to the signaling network, known as Signaling System 7 (SS7). SS7 provides the network with intelligence. It is responsible for setting up, maintaining, and tearing down a call while at the same time providing access to enhanced services such as Custom Local Area Signaling Services (CLASS),
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