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This Concept Map, created with IHMC CmapTools, has information related to: 802.11 Physical, Long PPDU has Long PPDU Preamble (144-bit), OFDM PHY uses OFDM PLCP Preamble STF | LTF | SIG, Clause 19 Extended Rate Physical (ERP) 802.11g can be ERP-OFDM 6, 9, 12, 18, 24, 36, 48, 54 Mbps, Station can transition between Transmit (Tx), Protection Mechanism allows coexistence of ERP-OFDM 6, 9, 12, 18, 24, 36, 48, 54 Mbps, PLCP Header 48-bit follows PLCP Preamble, PLCP Protocol Data Unit (PPDU) can be Long PPDU, PLCP Header 48-bit has Service Field (8-bit), Signal Field (8-bit) indicates modulation method to transmit a Pysical Service Data Unit (PSDU), Data Encoding may use Complementary Code Keying (CCK), Barker Coding produces Chips, PLCP Protocol Data Unit (PPDU) has PLCP Preamble, 802.11n PPDU can be a HT Greenfield PPDU HT GF STF | HT-LTF1 | HT-SIG | HT-LTFs | DATA, Short PPDU Preamble (72-bit) is divided into 16-bit Start of Frame Delimiter (SFD) 0000 0101 1100 1111, ERP-OFDM 6, 9, 12, 18, 24, 36, 48, 54 Mbps is equivalent to OFDM PHY, Clause 18 High Rate DSSS (HR-DSSS) 802.11b uses Complementary Code Keying (CCK), The IEEE 802.11 Physical (PHY) Layer has implementations Clause 20 High Throughput (HT) 802.11n, ERP-DSSS/CCK 1, 2, 5.5, 11 Mbps is equivalent to DSSS PHY, Convolutional Coding is a Forward Error Correction (FEC) Method, OFDM PHY uses Convolutional Coding