3Com 3CR17561-91-US Getting Started Guide - Page 30
Specifying the Redundant Power System, Power Input before, User Intervention, Correct Response
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30 CHAPTER 2: INSTALLING THE SWITCH Table 8 Switch Power Inputs Power Input before Power Input after User Intervention User Intervention AC mains and RPS RPS only AC mains and RPS AC mains only RPS only AC mains AC mains and RPS AC mains and RPS Correct Response The unit remains powered by the RPS. The unit is powered by the AC mains. PoE dropped on all ports, however the unit does not reset. PoE restarts powered by the remaining power from the AC mains. PoE ports will be dropped depending on their preset priority level. The total power available to the Switch may be less than when powered from the RPS. Some PoE ports may be dropped as they are unable to obtain the power they require. The unit remains powered by the RPS. The unit is powered by the RPS. PoE ports can be added. Specifying the 3Com's redundant power solution allows the use of any off-the-shelf Redundant Power -48V DC RPS that meets the requirements defined in Appendix C on System page 115. For an approved vendor list, more details about purchasing the 3Com recommended RPS and a full set of requirements go to: http://www.3Com.com/RPS The 3Com recommended RPS generates -48V DC power using power supply units (or rectifiers). The outputs of the rectifier(s) are connected together so that the total -48V power available can be increased by adding additional rectifiers. For example, three 1500W rectifiers can provide up to 4500W. Hot removal or insertion of a rectifier will not affect the -48V DC output voltage. Table 9 shows an example of the total power available from a number of 1500W rectifiers. A minimum of two rectifiers are required for each shelf to provide N+1 rectifier redundancy.