Channel 14 is only allowed in Japan, and then only for DSSS / CCK (802.11b), and not OFDM (802.11g/n). United States, hence Channels 12 and 13 are reserved essentially as a guard interval. For Channels 12 - 13, there can be out-of-band emissions in the restricted frequencyīand 2483.5-2500 MHz (encompassing Channel 14) which is used by the mobile satellite service in the While channels have a width of 20 MHz, there is some additional side-band leakage, typically at a level below -30 dB of the peak signal.
(2467 MHz and 2472 MHz) are actually allowed by the FCC at low power levels. While it is not generally known, Channels 12 and 13 Levels must be set so as to minimize the mismatch between the range of theĪccess point and the corresponding range of the client devices. Accordingly, though non-intuitively, theĮffective coverage area is driven by the client devices, and the AP power Think of it this way: the access point is shouting but the clientĭevice is whispering. The relatively weak transmissions of the client device in response. Strong transmission from the access point, but the access point cannot receive As a result, the client device can receive a relatively Transmitters in order to preserve both space and battery life. Most smartphone, tablet, and IoT appliances use relatively weak Power mismatch that leads to a range mismatch. Smartphones, tablets, and network appliances, however, there is often a transmit When most clients had reasonably strong transmitters themselves, such as Deployments, which were primarily driven by the coverage requirements, it wasĬommon to turn up the power on the AP transmitter as high as allowed by FCC and
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