IEEE 802.11bg
aliases:
IEEEE 802.11b/g802.11b802.11gWifi 1Wifi 3 Unit: 12 Lesson: 1
the second wifi standard of all time (OAT).
802.11b uses the 2.4 GHz frequency band, and was the twin brother of 802.11a on release. It standardized the use of DSSS and CCK signal encoding. While technically inferior to 802.11a with a data rate of 11 Mbps, 802.11b was quicker to market and became better established than 802.11a.
2.4 GHz Frequency Band (Raw Lesson Content)
The 2.4 GHz band is subdivided into up to 14 channels, spaced at 5 MHz intervals from 2412 MHz up to 2484 MHz. Because the spacing is only 5 MHz and DSSS needs 22 MHz channel bandwidth, 802.11b channels overlap quite considerably. This means that co-channel interference is a real possibility unless non-overlapping channels are chosen (1, 6, and 11, for instance). Also, in the Americas, regulations permit the use of channels 1-11 only, while in Europe channels 1-13 are permitted, and in Japan all 14 channels are permitted.
802.11g (Raw Lesson Content)
The 802.11g standard offered a relatively straightforward upgrade path from 802.11b. Like 802.11a, 802.11g uses OFDM, but in the 2.4 GHz band used by 802.11b and with the same channel layout. This made it straightforward for vendors to offer 802.11g devices that could offer backwards support for legacy 802.11b clients. 802.11g has a nominal data rate of 54 Mbps. When in 802.11b compatibility mode, it drops back to using DSSS.
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