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continuous awake mode consumes the most power, but offers the highest throughput This setting is recommended for desktop and notebook computers and portable devices when AC power is used Two power-save modes are available One switches between awake mode and sleep mode, depending on network traffic When retrieving a large number of packets, the client goes into awake mode and after the packets are received goes back into sleep mode This setting is recommended when power consumption is a concern, such as when a notebook s battery is being used to supply power and no AC source is immediately available The other power-save mode causes the AP to buffer incoming messages for the client adapter, which wakes up periodically and polls the AP to see if any stored messages are waiting for it The adapter can request each message and then go back to sleep This mode conserves the most power, but offers the lowest throughput It is recommended for devices for which power consumption is a critical concern, such as small battery-powered PDAs Network Type Two types of wireless networks are available: ad hoc and infrastructure Also known as peer to peer, ad hoc indicates that the wireless network consists of a few wireless devices that are not connected to a wired Ethernet network through an AP For example, an ad hoc network could be set up between computers in a conference room so users can share information during a meeting Infrastructure indicates that the wireless network is connected to a wired Ethernet network through an AP
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With the client configuration utility, the network administrator can set parameters that control how and when the client adapter transmits and receives data (see Figure 5-5) Data Rate In this field, the rate at which the client adapter handles packets to or from APs (in infrastructure mode) or other clients (in ad hoc mode) is set For infrastructure mode, automatic rate selection is recommended; the client uses the 11 Mbps data rate whenever possible, but adjusts to lower rates when necessary Selecting a specific data rate is recommended for ad hoc mode Selecting 1 Mbps offers the greatest range but the lowest throughput, whereas selecting 2 Mbps offers less range but greater throughput The 55 Mbps option offers less range but still greater throughput, whereas selecting 11 Mbps offers the greatest throughput but
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Figure 5-5 The RF Network screen of Cisco s configuration utility for 340 Series client adapters
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the lowest range The client adapter s data rate must match the setting of the AP If it does not, the client will not be able to associate with the AP Short Radio Headers Some clients can be configured to use short radio headers, but only if the AP is similarly configured Short radio headers improve throughput performance, whereas long radio headers ensure compatibility with clients and APs that do not support short radio headers If any clients associated with an AP are using long headers, however, then all clients in that cell must also use long headers World Mode Available only in infrastructure mode, this setting enables the client to adopt the maximum transmit power level and the frequency range of the AP to which it is associated, provided the AP is also configured for this mode This feature is intended for users who travel between countries and want their client adapters to associate with APs in different regulatory domains When enabled, the client adapter is limited to the maximum transmit power level allowed by the country s regulatory agency
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Periodic Scan This setting enables the client to look for a better AP if its signal strength becomes weak and then switch associations if it finds one The resulting signal handoff works much like a cell phone and base station As the user drives away from a base station and the signal weakens, the signal is handed off to another base station where the signal is stronger The process is transparent to the user, but the handoff allows uninterrupted communication as the user s location changes Channel This setting specifies the frequency the client adapter will use as the channel for communications with the AP In infrastructure mode, the channel is set automatically and cannot be changed The client adapter scans the entire spectrum, selects the best AP to associate with, and uses the same frequency as that AP In ad hoc mode, the channel of the client adapter must be set to match the channel used by the other clients in the wireless network The channels conform to the IEEE 80211 standard for each regulatory domain (see Table 5-1) Transmit Power This setting defines the power level at which the client adapter transmits This value must not be higher than that allowed by a country s regulatory agency For equipment intended for use in the United States, the following power levels, expressed in milliwatts, can be used: 100, 50, 30, 20, 5, or 1 mW Reducing the transmit power level conserves battery power but decreases the radio range; conversely, increasing the transmit power increases the radio range but consumes battery power faster In the United States, WiFi products may not exceed the power level of 100 mW Clear Channel Assessment (CCA) This setting specifies the method the client adapter will use to determine whether the channel is clear prior to the transmission of data If the channel is busy with traffic from another device, the client will hold back the transmission of data until the channel becomes clear Since data is bursty, the wait time is very short often the user is not aware of any transmission delay However, as more clients become active with the AP, the delay of waiting for the channel to become clear can become quite noticeable to users The client adapter can use several methods to determine whether a channel is clear With the energy-detect (ED) method, the channel is considered busy upon the detection of any energy above the ED threshold The energy level exceeds this threshold when data is being transmitted over the channel; after all, the transmission of 1s and 0s over any medium is simply
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