World 1. Each resource is allocated to a communication well. When telephone I have my wire. If it is not my own property becomes mine in use. Part of my phone, get in my station. Requires the use of a wire from my central power plant 50 km. Even the use of another wire from the central to another. And so on. Arrival at the center that serves my correspondent. And use the wire from the center up to his house. And all I do is make him the phone ring. If you answered consolidating the use of all these steps. If you do not answer a lot of work for nothing. At the end I have to redo everything on the contrary, release all resources. Resources that are mine are using to try to build communication, both for communication. Resources that belong to everyone and that everyone can use. One at a time. You build a circuit. A circuit between source and recipient. A circuit that allocates resources, juxtaposing many pieces, one after another. The action to build a circuit is called a switching action. Swap resources. Fascinating to think that there is a thread calling Sidney, one that binds me to pay them. Is unique because of the many threads together. Switching them to tie me. But the wires are not only of copper. The wires are optical fibers. The wires are radio channels. And they tie in all possible combinations: copper with radio, fiber, copper on the fiber. It is important to know how it is done the circuit, it is important to have it and use it. The circuit comes to my phone via radio. The circuit extends fiber between continents. The circuit jumps mountain radio. The circuit through the copper district. Some buried, some in air. A circuit for each purpose. Two calls, two circuits. A phone call and a mechanism of surveillance, two circuits. The separation is at the user level but also in services. Each circuit is confined and secured. Each circuit is protected from others. Each trip is different paths. A circuit can be the backup to another: the first is broken, use the second. The network realizes the dream of communication. The network is the set of wires that make the circuits. The network is the tool to have a circuit from each place to each other. The network is the alternative to having to pose a real thread between each place and each other. The network is the organization and management of all the wires. The network is the agreement between the operators of the wires in one place and another. The network is the distribution of costs for the investment, operation and maintenance. Circuits and circuits in the network or network?
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