Masterclock TCR1000 Spezifikationen PDF herunterladen (Seite 82)

Masterclock, Inc.

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phone(USAandCanada):1‐800‐940‐2248|phone(international):+1‐636‐724‐3666

email:[email protected]|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.



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.



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

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