Masterclock TCR1000 Especificações descarregar pdf (Página 87)

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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1.1SCOPE

ThisdocumentspecifiesawiredclocksystemthatreliesontheaccuracyoftheGlobalPositioningSatellite(GPS)system

forsynchronizingthetimeprovidedtoclocksandnetworkdevicesusingtheNetworkTimeProtocol(NTP).Suchaclock

systemreliesononeormoreNTPtimeserverswithan

integratedGPSreceiver,toactasmasterclocksandvirtuallyan

unlimitednumberofnetworkclockdisplaysactingasclientdevices.Inaddition,othernetworkclientdevicescanbenefit

fromtheavailabilityoftheNTPtimeservers.DataandlowvoltageDCpowercanbedistributedoverthesamenetwork

cableusing

PoweroverEthernettechnology,resultinginsignificantcostsavings.Thelimitationsareprimarilynetwork

configurationandimplementationbased,asthesystemcanbeaddedtoanexistingnetworkorconfiguredasan

independentnetworktosimplyprovideasynchronizedclockdisplaysystem.

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1.2GENERAL

NTP(NetworkTimeProtocol)serversallowclients

tosynchronizeclocks,bells,computerclocks,othercomputertiming

devicesandotherkindsofnetworkequipmentusingastandardreferenceoftimeacceptedworldwide,knownasUTC

(UniversalTimeCoordinated).NTPserverswithanintegratedGPSreceiverlocatedonaLAN(LocalAreaNetwork)can

providethehighaccuracyof

theGPSsatellitesystemtoprovidetheUTCreferencetime,eliminatingtheneedtoreceive

timefromaNTPserverlocatedontheInternet.PlacingoneormoreNTPonyourlocalnetworkbehindafacilityfirewall

enhancesreliability,redundancy,accuracy,andsecurity.

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UsingNTPisclearlyanadvantagesince

itpermitsautomaticsynchronizationofalltheequipmenthookeduptothe

network,thusreducingtheneedandassociatedcostforpersonneltotraveltoremoteclocklocationstosetthetime

manually.Ingeneral,ithasbeenobservedthatsincetherecentintroductionofNTPasastandardfornetwork

synchronization,

clockinstallationshavebecomeeasier,bettersynchronized,morereliable,andprovideatraceablesource

oftimeforcriticalnetworkfunctions,resultinginloweroverallcost.

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NTPprovidesasimplifiedprotocolcalledSNTP(SimplifiedNetworkTimeProtocol),whichclientscanutilizetosetthetime

totrustedNTPtimeservers.SNTPV4

isasubsetofthefullNTPV3versionandiswidelyacceptedforclientdevices.

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InformationForaGPSSynchronizedClockSystemusingNetworkTimeProtocolandPoweroverEthernet

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POE(PoweroverEthernet)isarecognizedandagrowingmethodofsignificantlyreducinginstallationcostsandproviding

low

voltageDCpowertonetworkdevicesbydistributingpowerovertheunusedpairofstandardnetworkcables.The

modestincrementalcostofpurchasingPOEequipmentthatiscomplianttotheIEEE802.3afstandard,dramaticallyoffsets

theinstallationcostsandsafetyissuesassociatedwithutilizinganddistributingACpower.AGPS

Synchronizedclock

systemusingNTPandPOEoffersignificantinstallationandmaintenancecostbenefitsovertraditionalclocksystems.

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2.1GENERALSYSTEMREQUIRMENTS

Thesynchronizedclocksystemshallmeetorexceedtherequirementsofthisspecificationinallaspects.

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2.2OPERATIONALREQUIREMENTSANDENVIRONMENTALSPECIFICATIONS

Theclocksystemshallbelocated

andoperatedinanindoorenvironment,withintheparametersofastandardnetwork

configuration,andutilizingstandardindustryprovidednetworkequipmentanddistributionmethods,including

standardizedPOEdistributiontechnology.Theclocksystemshalloperateautonomouslyandprovidesoftware

configurationoptionsfortimezoneoffsets,automaticdaylightsavingtimecorrectionswithout

scheduledoperator

interventionormaintenance.Theclocksystemshallbeconfiguredviasoftwarecontrolandshallallowforremote

monitoringandconfigurationchangeswhileprovidingpasswordprotection.

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Environmentalspecifications

Thesystemshalloperateunderthefollowingenvironmentalconditions:

•OperatingRange:32°Fto122°F(0°Cto50°

C)

•StorageRange:‐40°Fto70°F(‐40°Cto70°C)

•RelativeHumidity:0‐90%,non‐condensing

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Compliancespecifications

Allequipmentshallbetested,labeledandcertifiedbyanationallyrecognizedandapprovedtestinglaboratorytomeetthe

followinglowvoltagesafetyandelectromagneticcompliancerequirements

oftheUnitedStatesandEuropeanUnion.

•FCC,part15,ClassBlimitsforradiatedandlineconductedemissions

•ElectromagneticCompatibility89/336/EEC;92/31/EC;93/68/EEC;2004/108/EC

•Lowvoltagedirective2006/95/EC

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2.3CLOCKENGINEERINGREQUIRMENTSANDPERFORMANCE

Thenetworkclocksshallmeetthefollowingengineeringandperformancerequirements.

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10.2

Information

Suggested Functional Specs

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