802.11g PHYs
==============


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        **What is the PHY in IEEE 802.11g?**

        The PHY transmits and receives data over the 2.4 GHz band using OFDM and DSSS.

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        **What modulation does 802.11g use?**

        802.11g uses OFDM like 802.11a and DSSS/CCK for backward compatibility with 802.11b.

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        **What data rates are supported by 802.11g PHY?**

        Data rates include 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, and 54 Mbps.

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        **What is OFDM in 802.11g?**

        Orthogonal Frequency Division Multiplexing splits data over multiple subcarriers for better efficiency and robustness.

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        **How many subcarriers are used in 802.11g OFDM?**

        Same as 802.11a, 52 subcarriers (48 data + 4 pilot).

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        **What is the channel width in 802.11g?**

        20 MHz channel bandwidth, same as 802.11b and 802.11a.

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        **How many channels are available in 802.11g?**

        11 channels in the 2.4 GHz band, with 3 non-overlapping channels (1, 6, 11).

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        **Is 802.11g backward compatible?**

        Yes, it supports 802.11b modulation schemes for interoperability.

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        **What is the typical range of 802.11g?**

        Similar to 802.11b, around 100 meters indoors.

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        **Does 802.11g support OFDM guard intervals?**

        Yes, it uses a 0.8 µs guard interval like 802.11a.

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        **Does 802.11g support MIMO?**

        No, MIMO is introduced in later standards (802.11n and beyond).

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        **Is 802.11g half-duplex or full-duplex?**

        Half-duplex operation.

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        **Is 802.11g still used today?**

        Yes, though largely replaced by newer standards, it remains in use for legacy support.


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        Topics in this section,

                * :ref:`Reference links <phy_g_step17>`


.. _phy_g_step17:

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    .. tab-item:: Reference links

       * Reference links