Specifications

Masterclock, Inc.
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phone(USAandCanada):1‐800‐940‐2248|phone(international):+1‐636‐724‐3666
email:[e-mail]|online:www.masterclock.com
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Power‐over‐Ethernet(PoE)extendstheversatilityforsystemdesignersandcompanies.Nolongerwillonehavetolocate
accesspointswithinthetypicalsixfootelectricalcordreachofanACoutletorlookforconvenientlocationstoinstallnew
outletsatpointswhereitssuitabletorunconduitand
mountoutletboxes.
PoEonlyrequirestechnicianstorunoneEthernetcable–CAT5orCAT6‐totheaccesspointforsupplyingbothpowerand
data.WithPoE,Power‐sourcingequipmentdetectsthepresenceofanappropriate“powerdevice”(e.g.PoEhub)and
injectsapplicablecurrentintothedatacable.
Anaccesspointcanoperatesolelyfromthepoweritreceivesthroughthe
datacable.ThePoEisknownbyIEEE802.3afinternationalstandard.
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PoEoffersthefollowingbenefits:
CostSavings–Itsignificantlyreducestheneedforelectricianstoinstallconduit,electricalwiringandoutletsthroughouta
facility.Consideraninstallation
of50ormoreaccesspoints.Thisrequireslotsofconduits,outletboxes,electricalwiring
andthetimeofqualifiedelectrician(s).Thelowcost ofdeployingPoEcomparedtotraditionalelectricalcircuitsleadsto
worthwhilereturnsoninvestment.
FlexibleAccessPointLocations–WithPoEaLANdesignerhasgreater
freedomtolocateaccesspoints.Youdon’tneedto
dependononlylocationswithinshortdistancesfromACoutlets.Thismakesiteasytorelocateaccesspointsinthefutureif
aneedarises.
HigherReliability–Systemswithfewerwirestendtobemorereliable.WithLANsnotusingPoE,
anelectricianmayunplug
anaccesspointtouseitsACoutlettopowertheirequipment.Electriciansrewiringelectricalcircuitscouldinadvertentlycut
powertoanaccesspoint.PoEeliminatesthepossibilityofsituationsthatdisrupttheoperationofthenetwork.
EnhancedOperationalSupport–ManyPoEdevicesimplementSNMP
(simplenetworkmanagementprotocol),which
enablessupportstafftoremotelymanagetheelectricalpowersuppliedtotheaccesspoints.Supportstaffscandisablea
PoE‐enabledaccesspointbyshuttingoffitsaccesspointafterdetectingamalfunctionortampering.Thetemporary
disablingoftheaccesspointcanprotectagainstin
intruderfromcontinuingunauthorizedaccesstothedevice(s).Other
SNMP‐basedfeaturesenablethemonitoringoftheconditionandconsumptionofpower,whichenhancetheabilityto
ensuresmoothandefficientnetworkoperation.
EasierInternationalDevelopment–Formanufacturers,PoEoffersthebenefitofthevendornotneedingtoprovide
differentpowercordsforvariouscountries.Thisnotonlyhelpskeepthecostofaccesspointsdown—itisonelesspieceof
equipmentthatinstallerneedtoworryabout.
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Power‐over‐Ethernet(PoE)requires:
(Injector)+(PoEcompatibledevice)
VoltageandPinoutStandards–TheIEEEhasstandardizedontheuse
of48VDCastheinjectedPoEvoltage.Theuseofthis
highervoltagereducesthecurrentflowingthroughtheCAT5/CAT6cableandthereforeincreasestheCAT5/CAT6cable
lengthlimitations.
AllMasterclock,Inc.equipmentlabeledPoEcompatibleorcompliantwillacceptandoperatefromthe48
VDCthatis
suppliedovertheCAT5/CAT6cable.
10.2
Information
Benefits of PoE