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would go through as planned and revenue would flow. If they weren t home, however, or if they were on the phone, then no revenue was generated. Furthermore, the network resources that another caller might have used to place a call were not available to them, because they were tied up transporting call setup data which produces no revenue. SS7 changes all that. With SS7, the signaling data travels across a dedicated packet network from the calling party to the called party. SS7 verifies the availability of the called party s line, reserves it, and then and only then seizes a talk path. Once the talk path has been created it rings the called party s phone and places ringing tone in the caller s ear. As soon as the called party answers, SS7 silently bails out until one end or the other hangs up. At that point it returns the path to the pool of available network resources.
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We have not discussed the manner in which offices are connected to one another. As Figure 3-36 illustrates, an optical fiber ring with add-drop multiplexers interconnects the central offices so that interoffice traffic can be safely and efficiently transported. The switches have trunk units
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Figure 3-36 Typical network showing fiber ring interconnecting offices
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(TUs) that connect the back side, called the trunk side, of the switch to the wide area network; in this case the optical ring. Trunks that interconnect offices have historically been four-wire copper facilities (a pair in each direction). Today they are largely optical, but are still referred to as four-wire because of their two-way nature. An interesting point about trunks: In the 1960s and early 1970s, most interoffice trunks were analog rather than digital. To signal, they used single frequency tones. Because these trunks did not talk directly to customers, there was no reason to worry about a human voice inadvertently emitting a sound that could be misconstrued as a dialing tone. There was, therefore, no reason to use DTMF dialing instead, trunk signaling was performed using single frequency tones. Specifically, if a switch wished to seize a long-distance trunk, it issued a single-frequency 2,600 Hz tone, which would signal the seizure to take place. Once the trunk seizure had occurred, the dialed digits could be outpulsed and the call would proceed as planned. In 1972, John Draper, better known by his hacker name Captain Crunch, determined that the toy plastic bosun s whistle that came packed in boxes of Cap n Crunch cereal emitted you guessed it 2600 Hz. Anyone who knew this could steal long-distance service from AT&T by blowing the whistle at the appropriate time during call setup. Before long, word of this capability became common knowledge and Cap n Crunch cereal became the breakfast food of choice for hackers all over the country. Soon hackers everywhere were constructing blue boxes, small oscillators built from cheap parts that would emit 2,600 Hz and make possible the kind of access that Draper and his cohorts were engaged in. In fact, Steve Wozniak and Steve Jobs, both founders of Apple, were early blue box users and, according to legend, used the money they made building blue boxes to fund the company that became Apple. Draper, a highly skilled hacker, was eventually caught and prosecuted for his activities, but he was given work furlough and was able to continue his software design studies. He is now a successful intrusion detection software designer! Returning to our example again, then, let s retrace our steps. Cristina dials Adam s number. The call travels over the local loop, across aerial and/or underground facilities, and enters the central office via the cable vault. From the cable vault the call travels up to the main distribution frame and then on to the switch. The number is received by the switch in Cristina s serving central office, which performs an SS7 database lookup to determine the proper disposition of the call and any special service
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