3Com 4500 Getting Started Manual

Also see for Switch 4500 Family: Product guide Datasheet Datasheet Datasheet Datasheet

Contents

3Com 4500 Getting Started Manual Manual pdf 22 page image

22 CHAPTER 2: INSTALLING THE S WITCHConnecting aRedundant PowerSupply to your Switch4500 PWRThe Switch 4500 PWR 26 and 50 port have a -48V DC Redundant Power Supplysocket that can be used in addition to the standard AC connection of the switch.If you intend to use this DC connection, please read this section.WARNING: The installation of the Redundant Power Supply (RPS) should only becarried out by properly trained and qualified personnel.WARNING: These instructions must be read in conjunction with the RPS flyer andthe safety and installation instructions supplied with your RPS.WARNING: When powering any Switch 4500 PWR from an RPS, the unit must beearthed (grounded). This can be achieved by either connecting the power cord tothe unit or by connecting the earth terminal on the rear of the unit to a reliableelectrical earth, or by connecting both. You must ensure that the earth connectionis made before connecting the DC supply from the RPS.3Com Switches which support -48V DC RPS inputs, that are PoE enabled, can onlybe powered by an RPS which complies with the isolation requirements of IEEE-Std802.3af. Non PoE enabled switches do not have this restriction.WARNING: A standard 'positive-earthed' -48V redundant power system suitablefor use with telecommunications equipment should not be used with the 3ComPower-over-Ethernet (PoE) network switches. In order to meet the IEEE 802.3af(PoE) specification, the -48V output must be isolated from earth (ground) andmeet the isolation requirements in that specification.