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Protocols
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Figure 2-28 Meshed network; 5 users, 10 circuits.
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The racket is almost deafening. Boys are rushing madly hither and thither, while others are putting in or taking out pegs from a central framework as if they were lunatics engaged in a game of fox and cheese. It was a perfect bedlam.
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Later in 1878, the boys were grabbed by their ears and removed from their operator positions. They were replaced quickly, to the enormous satisfaction of the customers according to a multitude of accounts, by women, shown in Figure 2-29. These operators were, in fact, the first switches. Now, instead of needing a dedicated circuit running from every customer to every other customer, each subscriber needed a single circuit that ran into the central exchange, where it appeared on the jack field in front of an operator (each operator managed approximately 100 lines, the optimum number according to Bell System studies). When a customer wanted to make a call, they would crank the handle on their phone, generating a current that would cause a flag to drop, a light to light, or a bell to ring in front of the operator. Seeing the signal, the operator would plug a headset into the customer s jack appearance and announce that they were ready to receive the number to be dialed. The operator would then simply crossconnect the caller to the called party, and then wait for the receiver to be picked up on the other end. The operator would periodically monitor the call and pull the patch cord down when the call was complete. This model meant that instead of needing 3,997,999 circuits to provide universal connectivity for a town of 2,000 people, 2,000 were needed.
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Figure 2-29 First women operators (Courtesy Lucent Technologies).
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2
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A rather significant reduction in capital outlay for the telephone company, wouldn t you say Instead of looking like Figure 2-28, the network now looked like Figure 2-30. Over time, manual switching slowly disappeared, replaced by mechanical switches followed by more modern all-electronic switches. The first true mechanical switches didn t arrive until 1892 when Almon Strowger s Step-by-Step switch was first installed by his company, Automatic Electric. Strowger s story is worth telling, because it illustrates the serendipity that characterized so much of this industry s development. It seems that Almon Strowger was not an inventor, nor was he a telephone person. He was, in fact, an undertaker in a small town in Missouri. One day, he came to the realization that his business was (OK, I won t say dying) declining and upon closer investigation determined that the town s operator was married to his competitor. As a result, any calls that came in for the undertaker naturally went to her husband, and not to Strowger. To equalize the playing field, Strowger called upon his considerable talents as a tinkerer and designed a mechanical switch and dial telephone, shown in Figure 2-31, which is still in use today in a number of developing countries. The bottom line to all this is that switches create temporary end-toend paths between two or more devices that want to communicate with each other, which is accomplished in a variety of ways. Circuit-switched networks create a virtually dedicated path between the two end points
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Protocols
Protocols
Figure 2-30 Switched network; five users, five circuits.
Figure 2-31 Strowger dial telephone.
and offer constant end-to-end delay, making them acceptable for delaysensitive applications or connections with long hold times. Store-and-forward networks, particularly packet networks, work well for short, bursty messages with minimal delay sensitivity. Managing all this, however, is more complicated than it would seem at first blush. First of all, the switches must have the capability to select not
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