3Com ProCurve E4500-48 Getting Started Manual

Also see for Switch 4500 PWR 26-Port: Getting started Getting started Getting started guide Configuration guide Datasheet

Contents

68 CHAPTER 5: PROBLEM SOLVINGIf your IP network is internal to your organization only, that is, you do notaccess the Internet, you may use any arbitrary IP address as long as it isnot being used by another device on your network. 3Com suggests youuse addresses in the range 192.168.0.0 to 192.168.255.255 with asubnet mask of 255.255.255.0.These suggested IP addresses are part of a group of IP addresses thathave been set aside specially for use ‘in house’ only.A device is connected to a Switch 4500 PWR but power is notbeing suppliedIf power is not being supplied to a device connected to a Switch 4500PWR, you should do the following checks:■ Check that the device is compliant with the 802.3af standard ref. [18].The 4500 PWR will only supply power through the front panel port to802.3af compliant devices.■ Check that power budget for the Switch has not been exceeded.If the power budget has been exceeded, then by default, the powereddevice connected to the Power over Ethernet port with the lowestpriority port will lose power. However, if all the devices connected tothe Switch have equal priority levels, then the port with the highestnumber will lose power.By default, the Switch will allow a device to receive power as long asPower over Ethernet power supply has 18 watts spare in its powerbudget. If this much power is not available, the device will not bepowered (unless it has a higher priority than existing powered ports)and a PoE fault will be reported for that port. If enough powersubsequently becomes available, the port will be powered.■ Check that the port has not had a power limit imposed on it.