802.11g Physical Rates ========================= .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What are physical rates in IEEE 802.11g?** Physical rates refer to the data transmission speeds supported by the 802.11g standard. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the maximum data rate of 802.11g?** Up to 54 Mbps using OFDM modulation in the 2.4 GHz band. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does 802.11g achieve different data rates?** By using adaptive modulation and coding schemes like BPSK, QPSK, 16-QAM, and 64-QAM. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are 802.11g data rates backward compatible?** Yes, it supports legacy 802.11b rates (1, 2, 5.5, 11 Mbps) for compatibility. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does rate adaptation work in 802.11g?** Devices adjust data rates dynamically based on signal quality and interference. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What frequency band does 802.11g use for these rates?** The 2.4 GHz ISM band with 20 MHz channel bandwidth. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How do physical rates impact Wi-Fi performance?** Higher rates provide faster throughput but may require better signal conditions. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What modulation schemes are used at the highest rates?** 64-QAM with a coding rate of 3/4 or 5/6. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can physical rates vary during a connection?** Yes, to maintain connection quality, devices dynamically switch rates. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow Topics in this section, * :ref:`physical_rates in 802.11g ` * :ref:`Reference links ` .. _physical_rates_g_step4: .. tab-set:: .. tab-item:: physical_rates in 802.11g ========== === ==== =========== ============ =========== ================ ========= ============ =========== ========== ====== Modulation BW Tsc FSP=BW/Tsc Tdata=1/FSP GI=Tdata/4 Symbol=Tdata+GI 1/Symbol Bits/Symbol Code rate Usable sc Rate ========== === ==== =========== ============ =========== ================ ========= ============ =========== ========== ====== BPSK 5 64 78.125 12.8 3.2 16 0.0625 1 1/2 48 1.5 BPSK 5 64 78.125 12.8 3.2 16 0.0625 1 3/4 48 2.25 QPSK 5 64 78.125 12.8 3.2 16 0.0625 2 1/2 48 3 QPSK 5 64 78.125 12.8 3.2 16 0.0625 2 3/4 48 4.5 16-QAM 5 64 78.125 12.8 3.2 16 0.0625 4 1/2 48 6 16-QAM 5 64 78.125 12.8 3.2 16 0.0625 4 3/4 48 9 64-QAM 5 64 78.125 12.8 3.2 16 0.0625 6 2/3 48 12 64-QAM 5 64 78.125 12.8 3.2 16 0.0625 6 3/4 48 13.5 BPSK 10 64 156.25 6.4 1.6 8 0.125 1 1/2 48 3 BPSK 10 64 156.25 6.4 1.6 8 0.125 1 3/4 48 4.5 QPSK 10 64 156.25 6.4 1.6 8 0.125 2 1/2 48 6 QPSK 10 64 156.25 6.4 1.6 8 0.125 2 3/4 48 9 16-QAM 10 64 156.25 6.4 1.6 8 0.125 4 1/2 48 12 16-QAM 10 64 156.25 6.4 1.6 8 0.125 4 3/4 48 18 64-QAM 10 64 156.25 6.4 1.6 8 0.125 6 2/3 48 24 64-QAM 10 64 156.25 6.4 1.6 8 0.125 6 3/4 48 27 BPSK 20 64 312.5 3.2 0.8 4 0.25 1 1/2 48 6 BPSK 20 64 312.5 3.2 0.8 4 0.25 1 3/4 48 9 QPSK 20 64 312.5 3.2 0.8 4 0.25 2 1/2 48 12 QPSK 20 64 312.5 3.2 0.8 4 0.25 2 3/4 48 18 16-QAM 20 64 312.5 3.2 0.8 4 0.25 4 1/2 48 24 16-QAM 20 64 312.5 3.2 0.8 4 0.25 4 3/4 48 36 64-QAM 20 64 312.5 3.2 0.8 4 0.25 6 2/3 48 48 64-QAM 20 64 312.5 3.2 0.8 4 0.25 6 3/4 48 54 ========== === ==== =========== ============ =========== ================ ========= ============ =========== ========== ====== .. _physical_rates_g_step17: .. tab-set:: .. tab-item:: Reference links * Reference links