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In a multiple cell network topology, overlapping and/or adjacent cells using different channels can operate simultaneously. 4 Transmit and receive in-band and out-of-band spurious emissions The OFDM PHY shall conform to in-band and out-of-band spurious emissions as set by regulatory bodies. 407. request to the PMD and the start of the corresponding symbol at the air interface. 26 Copyright © 1999 IEEE. All rights reserved. 6 Slot time The slot time for the OFDM PHY shall be 9 µs, which is the sum of the RX-to-TX turnaround time, MAC processing delay, and CCA detect time (< 4 µs).

In general, these are specified by primitives from the PLCP, and the transmit PMD entity provides the actual means by which the signals required by the PLCP primitives are imposed onto the medium. 1 Transmit power levels The maximum allowable output power according to FCC regulations is shown in Table 89. Copyright © 1999 IEEE. All rights reserved. 2 Transmit spectrum mask The transmitted spectrum shall have a 0 dBr (dB relative to the maximum spectral density of the signal) bandwidth not exceeding 18 MHz, –20 dBr at 11 MHz frequency offset, –28 dBr at 20 MHz frequency offset and –40 dBr at 30 MHz frequency offset and above.

Request shall be enabled so that the PHY entity shall be in the transmit state. Further, the PHY shall be set to operate at the appropriate frequency through station management via the PLME. 2. indicate (IDLE). request. request (TXVECTOR) primitive. request are the PLCP header parameters DATARATE, SERVICE, and LENGTH, and the PMD parameter TXPWR_LEVEL. The PLCP shall issue PMD_TXPWRLVL and PMD_RATE primitives to configure the PHY. request primitive. Once PLCP preamble transmission is started, the PHY entity shall immediately initiate data scrambling and data encoding.

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