Installation ManualH3C S7500E Series Ethernet Switches Chapter 1 Product Overview1-9active-standby switchover. Different LPUs are inserted in the other six slots (seecallout (2) in Figure 1-8).z The fan tray is installed above the SRPUs and LPUs (see callout (1) in Figure 1-8)and the air flows up from the bottom.z The two power modules, which sit in the lower part of the chassis (see callout (3) inFigure 1-8), provide 1+1 redundancy backup. You can select either AC powersupply or DC power supply.1.2.2 BackplaneThe backplane in the integrated chassis of the S7500E series implements high-speeddata exchange as well as management & control signal exchange between SRPUs andLPUs.The backplane mainly provides the following functions:z Interconnection between cardsz Card hot-swappingz Automatic slot recognitionz Automatic chassis type recognitionz Distributed power supply to the system. The S7506E-V has two backplanes:signal backplane and power supply backplane. The power supply backplane isconnected to the power modules and is also connected to the signal backplanewith an internal cable.z Connection of the signal cable that monitors the fan tray and power supply1.2.3 Power Supply SystemThe S7500E series support a variety of power modules, as listed in Table 1-3.Table 1-3 Power module models of the S7500E seriesModel Height Power inputmode (AC/DC)Support PoEpower (Yes/No)PSR320-A 1 U AC NoPSR320-D 1 U DC NoPSR650-A 1 U AC NoPSR650-D 1 U DC NoPSR1400-A 3 U AC NoPSR1400-D 3 U DC NoPSR2800-ACV 3 U AC No
