Enterasys S8-Chassis-POE4 - Poe Port Status Leds; Allocation of Poe Power to Devices; Management of Poe Power to Pds

PoE Port Status LEDs
B-2 About PoE (Power over Ethernet)
PoE Port Status LEDs
ThePoEportstatusofeach10/100/1000MbpsRJ45portonanS‐SeriesI/Omoduleisindicatedby
thetwo‐colorRXandTXLEDdisplayforeachport.ToobservethePoEportstatusindications,
youmustswitchtheS‐SeriesI/OmodulefromthedefaultRX/TXStatus
ModetothePoEPort
StatusModeusingtheredPoEbutton.Theswitchoperationandadescriptionofhowtousethe
LEDindicationsaredescribedintheEnterasysS‐SeriesModuleHardwareInstallationGuide.
Allocation of PoE Power to Devices
WhenequippedwithaPoEsubsystemandS‐POE‐PSpowersupplies,theS‐Serieschassis
providesdedicatedPoEpowerforpowereddevice s(PDs)attachedtothe10/100/100 0MbpsRJ45
portsontheinstalledS‐SeriesI/Omodules.
TheS‐SeriesfirmwaredeterminesthepoweravailableforPoEbasedonpower
supplystatusand
powersupplyredundancymode.Whenanychangeismadetothepowersupplystatusor
redundancymode,thefirmwarerecalculatesthepoweravailableforPoE.
ThepoweravailableforPoEisdistributedbasedontheconfiguredallocationmode:
• Automaticmode(default),inwhichavailablepowerisdistributedevenly.
Anychangein
availablepower,duetoachangeinpowersupplystatusorredundancymode,willtriggeran
automaticredistributionofpower.
• Manualmode,inwhichthepowerbudgetismanuallyconfigured,usingeitherCLI
commandsortheMIBs.Thewattageconfiguredcannotexceedthetotalpoweravailableon
the
switchforPoE.
TheconfiguredwattageassignmentisusedtocalculatethetotalavailablePoEpower.Ifthe
totalavailablePoEpowerchanges,aredistributionofavailablepowerwilloccur,applyingthe
calculatedpercentage.
IfthePoEpowerneededorrequestedexceedsthepoweravailable,thesystemwillgenerateatrap

tonotifythesystemmanager.
Formoreinformationonconfiguringallocationmode,seetheEnterasysS‐SeriesCLIReference
Guide.
Management of PoE Power to PDs
YoucanconfigurehowtheS‐SerieschassismakespoweravailabletoattachedPDs:
• Real‐timemode(default),inwhichthePoEcontrollercalculatesthepowerneededbyaPD
basedontheactualpowerconsumptionoftheattacheddevices.
• Classmode,inwhichthePoEcontrollermanagespowerbased
ontheIEEE802.3atdefinition
oftheclasslimitsadvertisedbytheattacheddevices.Inthismode,themaximumamountof
powerrequiredbyadeviceintheadvertisedclassisreservedfortheport,regardlessofthe
actualamountofpowerbeingusedbythedevice.
Formoreinformationon
configuringpowermanagementmode,seetheEnterasysS‐SeriesCLI
ReferenceGuide.