Enterasys Networks G3G124-24 Manual de usuario descargar pdf (Pagina 22)

Features

1-4 Introduction

commonmodevoltageonthesignalpair.PoEexploitsthisfactbyusingtwotwistedpairsasthe

twoconductorstosupplyadirectcurrent.Onepaircarriesthepowersupplycurrentandtheother

pairprovidesapathforthereturncurrent.Whileseveralproprietarylegacyimplementationsof

PoEhave

beendeployedbyLANequipmentvendors,in2003theIEEEpublishedtheIEEE802.3af

specification,whichispartofthe802.3suiteofstandards.

TheswitchisfullycompliantwiththeIEEE802.3afstandard.Itsupportsthestandardresistor‐

baseddetectionmethod,aswellasACdisconnectcapability.Theswitchis

alsocapableof

supplying15.4wattsofpowerto96portsinnonredundantpowermode,and9.4wattsofpower

to96portsinredundantpowermode.

Powered Device Classifications (PDs)

PDsaredevicesthatreceivetheiroperating48VdcpowerthroughaneworexistingEthernet

cablefromaswitchorotherdevicethatcanprovideaPoE‐compliantportconnection.This

enablesthePDtooperateinalocationwithoutlocalpower.Forexample:

• DevicessuchasPoE‐compliantremote

EXITsignsandPersonalDataAssistants(PDAs),

• DevicesthatsupportVoiceoverIPsuchasPoE‐compliantdigitaltelephones,

• DevicesthatsupportWirelessApplicationProtocol(WAP)suchas securitycameras,laptop

PCs,andmanymoredevices.

Fan Management

TheG3systemsupportsthreegroupsofindependentlycontrollablefansandseveralfirmware

readablethermalsensors.Fanzonesareasfollows:

•Group1(fans1,2,and3)islocatedinthefrontleftoftheswitchtocooltheEthernet

subsystemandoptional1OMmoduleslots.

•Group2(fans8and

9)islocatedinthebackleftoftheswitchbehindGroup1tocooltheCPU

subsystem.

•Group3(fans4,5,6,and7)islocatedoneithersideofthepowerslotstocoolthepower

supplies

FanspeedsaredeterminedbythermalsensorslocatedthroughouttheG3

system.Thefirmware

samplestheappropriatethermal sensorsatregularintervals,andsetstheappropriatefanspeeds.

Fangroup1drivesairflowacrossthefrontportionofthechassis,andfangroups2and3driveair

flowacrosstherearportionofthechassis.

Forfangroup1,when

allappropriatetemperaturesensorsregistertemperaturesof50degreesC

orlower,group1fansrunat60%ofmaximumspeed.Ifsoftwaredetectsanysensorreading(on

thebaseboardoranyIOMmodule)above50degreesC,allgroup1fanswillincreaseto100%of

maximumspeed.Inaddition,

iffirmwaredetectsafailureofanyfaningroup1,allothergroup1

fanswillbeincreasedto100%ofmaximumspeed.

Forfangroup2,behaviorissimilar.Whenallappropriatetemperaturesensorsregister

temperaturesof50degreesCorlower,group1fansrunat60%of

maximumspeed.If firmware

detectsanysensorreading(ontherearofthebaseboardoranypowersupplysensor)above50

degreesC,allgroup2and3fanswillincreaseto100%ofmaximumspeed.Inaddition,iffirmwa re

detectsafailureofanyfaningroup2or

3,allothergroup2and3fanswillbeincreasedto100%of

maximumspeed.

RefertotheEnterasysG‐SeriesConfigurationGuideforinformationonusingtheG3CLIto

determinefanstatus.

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