Installation ManualH3C S7500 Series Ethernet Switches Chapter 1 Product Overview1-191.5.4 Power SupplyNote:z The S7500 series support AC and DC power supply. You can select AC or DCpower modules as required.z Only one power module can ensure the normal operation of the S7503. However,the S7503 provides two power module slots to implement 1+1 redundancy backup.z Two power modules can ensure the normal operation of the S7506 or the S7506R.However, the S7506 or S7506R provides three power module slots to implement2+1 redundancy backup.z The power modules of the S7500 series are hot swappable.z Although the S7503 provides three power module slots, no power module can beinserted in the power module slot marked with NULL. Therefore, the PWR3 LED isalways off.AC power modules and DC power modules of the S7500 series mustz Have exactly the same dimensions and ports.z Have exactly the same type of output connector in the same position.z Not be inserted into one switch.z Use their corresponding power distribution boxes.(1)(2)(3)(1) Captive screw (2) Front shell of power module(3) Air filterFigure 1-12 Power module
