Operation Manual – PoEH3C S7500 Series Ethernet Switches Chapter 1 PoE Configuration1-21.1.2 PoE Features Supported by S7500S7500 series Ethernet switches (hereinafter referred to as S7500 series) support PoE.Equipped with external power supply and PoE-enabled boards, S7500 series canprovide –48 VDC power to remote PDs through twisted pairs.z The S7500 series support IEEE802.3af standard. They can also supply power toPDs noncompliant with the standard.z The power supply of the S7500 series is administered by the main control board;each PoE board on the switch can be viewed as a PSE and administers the powersupply of all the ports on it independently.z The S7500 series can deliver data and current simultaneously through data wires(1, 3, 2, and 6) of category-3/5 twisted pairs.z The S7500 series supply power through the Ethernet electrical ports on theservice boards. Each service board can supply power to up to 48 remote devicesat the maximum distance of 100 m (328 feet).z Each Ethernet port can supply at most a power of 15.4 W to remote PDs.z When the S7500 series supply power to remote devices, the maximum total powerthat it can provide is 2,400 W. The switch determines whether to supply power tothe next remote PD it discovers depending on the total power it currently supplies.Note:z When the PoE-enabled S7500 series supply power to remote PDs, the PDs neednot have any external power supply.z If a remote PD has an external power supply, the PoE-enabled S7500 series andthe external power supply will be redundant with each other for the PD.1.1.3 External PSE2500-A1 Power SystemIf PSE2500-A1 power system is taken as the external power supply, the power isdistributed as follows:1) Input voltage: 100 VAC to 140 VACz One power supply unit (PSU) of the PSE2500-A1 power system can supply 1,250W of power, and two PSUs can supply up to 2,400 W of power.z If the PSUs of PSE2500-A1 power system need to work in redundancy mode,three PSUs are required and they work together to supply 2,400 W of power.2) Input voltage: 200 VAC to 240 VACz One PSU of the PSE2500-A1 power system can supply 2,500 W of power.z If the PSUs of PSE2500-A1 power system need to work in redundancy mode, twoPSUs are required.
