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to transmit, it simply does so, knowing that there exists the possibility that the transmitted signal may collide with the signal generated by another station that transmits at the same time. Even though the transmissions are electrical and are occurring on a LAN, some delay occurs between the time that both stations transmit and the time that they both realize that someone else has transmitted. This realization is called a collision and it results in the destruction of both transmitted messages, as shown in Figure 4-19. In the event that a collision occurs as the result of simultaneous transmission, both stations back off by immediately stopping their transmissions, waiting a random amount of time, and trying again. This technique has the wonderful name of truncated binary exponential backoff. It s one of those phrases you just have to commit to memory because it sounds so good when you casually let it roll off the tongue in conversation. Ultimately, each station will get a turn to transmit, although how long they may have to wait is based on how busy the LAN is. Contentionbased systems are characterized by what is known as unbounded delay, because no upward limit exists on how much delay a station can incur as it waits to use the shared medium. As the LAN gets busier and traffic increases, the number of stations vying for access to the shared medium, which only enables a single station at a time to use it by the way, also goes up, which naturally results in more collisions. Collisions translate into wasted bandwidth, so LANs do everything they can to avoid them.

The Rheostat A variable resistor can be made from a wirewound element, rather than a solid strip of material. This is called a rheostat. It can have either a rotary control or a sliding control. This depends on whether the resistive wire is wound around a donut-shaped form (toroid ) or a cylindrical form (solenoid ). Rheostats have inductance as well as resistance. They share the advantages and disadvantages of fixed wirewound resistors. A rheostat is not continuously adjustable, as is a potentiometer. This is because the movable contact slides along from turn to turn of the wire coil. The smallest possible increment is the resistance in one turn of the coil.

Perceived levels of sound, and of other phenomena such as light and radio signals, change according to the logarithm of the actual power level. Units have been invented to take this into account.

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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.

Rheostats are used in high-voltage, high-power applications. A good example is in a variablevoltage power supply. This kind of supply uses a transformer that steps up the voltage from the 117-V utility mains, and diodes to change the ac to dc. The rheostat can be placed between the utility outlet and the transformer (Fig. 6-11). This results in a variable voltage at the power-supply output.

108 Resistors The fundamental unit of sound change is called the decibel, abbreviated dB. A change of 1 dB is the minimum increase in sound level that you can detect, if you are expecting it. A change of 1 dB is the minimum detectable decrease in sound volume, when you are anticipating the change. Increases in volume are positive decibel values; decreases in volume are negative values. If you aren t expecting the level of sound to change, then it takes about 3 dB or -3 dB of change to make a noticeable difference.

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