Cisco Cisco Aironet 350 Mini-PCI Wireless LAN Client Adapter Guia Do Desenho
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Enterprise Mobility 4.1 Design Guide
OL-14435-01
Chapter 3 WLAN Radio Frequency Design Considerations
Planning for RF Deployment
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Cisco Wireless IP Phone 7920 Design and Deployment Guide
WLAN Data Rate Requirements
Data rates affect AP coverage areas. Lower data rates (such as 1 Mbps) can extend the coverage area
farther from the AP than higher data rates (such as 54 Mbps) as illustrated in
farther from the AP than higher data rates (such as 54 Mbps) as illustrated in
(which is not
drawn to scale). Therefore, the data rate (and power level) affects coverage and consequently the number
of APs required for the installation, as illustrated in
of APs required for the installation, as illustrated in
planning process, consider the required data rates, the required range, and the required reliability.
Data Rate Compared to Coverage Area
Different data rates are achieved by the AP using different encoding techniques on the wireless link,
allowing data to be more easily recovered from noise; this can be seen in the different receiver
sensitivities for the different data rates. The number of symbols, or chips, sent out for a packet at the 1
Mbps data rate is greater than the number of symbols used for the same packet at 11 Mbps. This means
that sending data at the lower bit rates takes more time than sending the equivalent data at a higher bit
rate. And when there is more than one client associated to the radio, the lower rate client affects the
higher rate clients’ maximum data throughput by taking longer to transmit a packet of the same length.
allowing data to be more easily recovered from noise; this can be seen in the different receiver
sensitivities for the different data rates. The number of symbols, or chips, sent out for a packet at the 1
Mbps data rate is greater than the number of symbols used for the same packet at 11 Mbps. This means
that sending data at the lower bit rates takes more time than sending the equivalent data at a higher bit
rate. And when there is more than one client associated to the radio, the lower rate client affects the
higher rate clients’ maximum data throughput by taking longer to transmit a packet of the same length.
, depends on factors such as environment,
power level, and antenna gain.