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Data transfer Based on a Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) algorithm as the media access scheme. Association The establishment of wireless links between wireless clients and access points (APs). Authentication The process of conclusively verifying a client s identity prior to a wireless client associating with an AP. 802.11 devices operate under an open system where any wireless client can associate with any AP without verifying credentials. True authentication is possible with the use of the Wired Equivalent Privacy Protocol (WEP), which uses a shared key validation protocol similar to that used in Public Key Infrastructures (PKI). Only those devices with a valid shared key can be associated with an AP. Privacy By default, data is transferred in the clear. Any 802.11compliant device can potentially eavesdrop on PHY 802.11 traffic that is within range. WEP encrypts the data before it is transmitted using a 40-bit encryption algorithm known as RC4. The same shared key used in authentication is used to encrypt or decrypt the data; only clients with the correct shared key can decipher the data. Power management 802.11 defines an active mode, where a wireless client is powered at a level adequate to transmit and receive, and a power save mode, under which a client cannot transmit or receive, but consumes less power while in a standby mode of sorts.

Pieces of quartz, when cut into thin wafers and subjected to voltages, will vibrate at high frequencies. Because of the physical dimensions of such a crystal, these vibrations occur at a precise frequency fo, and also at whole-number multiples of fo. These multiples, 2fo, 3fo, 4fo, and so on, are called harmonics. The frequency fo is called the fundamental frequency of the crystal. Quartz crystals can be made to act like LC circuits in electronic devices. A crystal exhibits an impedance that varies with frequency. The reactance is zero at fo and the harmonic frequencies.

plane, corresponding to the points shown in Fig. 14-6.

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802.11 has garnered a great deal of attention in recent months, particularly with the perceived competition from Bluetooth, another shortdistance wireless protocol. Significantly more activity is underway in the 802.11 space, however, with daily product announcements throughout the industry. Various subcommittees have been created that address everything from security to voice transport to quality of service; it is a technology to watch.

248 Capacitive reactance might take awhile for them to become fully charged. The current, once the plates are charged, will be zero.

When ac is driven through a capacitor and starts to increase (in either direction), it takes a fraction of a cycle for the voltage between the plates to follow. Once the current starts decreasing from its maximum peak (in either direction) in the cycle, it again takes a fraction of a cycle for the voltage to follow. The instantaneous voltage can t quite keep up with the instantaneous current, as it does in a pure resistance. Thus, in a circuit containing capacitive reactance, the voltage lags the current in phase. Another, and more often used, way of saying this is that the current leads the voltage.

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If you put some insulating material, such as glass, between the plates, their mutual voltage will not change, although the charging time might increase. If you increase the source voltage, the potential difference between the plates will follow along, more or less rapidly, depending on how large the plates are and on what is between them. If the voltage is increased without limit, arcing will eventually take place. That is, sparks will begin to jump between the plates.

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