Lower data rates, such as 1 Mbps, use simpler modulation schemes (e.g., BPSK) which are more robust against noise and require lower signal-to-noise ratios (SNR) for successful reception.This means that frames transmitted at lower data rates can be received over longer distances compared to higher data rates like 54 Mbps, which use more complex modulation schemes (e.g., 64-QAM) that require higher SNR and are more susceptible to signal degradation.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on ProtocolandSpectrum Analysis

IEEE 802.3at (PoE+) provides up to 30 watts of power per port. To determine how many devices can be supported with a total budget of 740 W:
740 W ÷ 30 W per device = 24.67
However, due to real-world power overheads and cable losses, it's safe to estimate each device may draw up to ~25-30 W. Most vendors recommend a planning budget of around 25-28 W per 802.3at device.
Safe calculation using full 30 W:
740 ÷ 30 = 24.6 # you could theoretically power 24, but for guaranteed power availability considering margin, most designs plan for:
740 ÷ 40 = 18.5 # about 18 devices conservatively
answer: 18 devices can certainly be powered.
- Reference: CWDP-305 Official Study and Reference Guide, Chapter on Infrastructure Design