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CHAPTER 6 Transmission Techniques: Wire and Cable Power sourcing equipment (PSE) 4 5 48 Vdc + - RX 1 TR 2 3 6 7 8 Spare pair Signal pair Signal pair Spare pair 1 2 3 6 7 8 4 5 Powered device (PD) TX A. Power supplied via data pairs Power sourcing equipment (PSE) 48 Vdc 4 5 Spare pair + - 1 TR 2 Signal pair 1 2 RX 4 5 Powered device (PD) DC/DC converter RX