December 2019
Beginner
510 pages
12h 7m
English
Content preview from Networking Fundamentals
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IEEE 802.11b
Like IEEE 802.11a, the 802.11b standard was released in September 1999. However, this standard utilized the 2.4 GHz frequency range and therefore is not compatible with 802.11a. This disparity in frequency between the two standards meant that there was no compatibility between the devices in each of the standards. 802.11b has a maximum indoor range of 35 m.
For modulation, 802.11 uses a technique called Direct Sequence Spread Spectrum (DSSS). If a radio signal is corrupted in transit between devices for any reason, such as interference or a weak signal, then it would likely be discarded and the original transmission would have to be re-sent. This becomes more of an issue over distance or in areas of higher RFI. To overcome this ...
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