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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2.3.1NETWORKCLOCKENGINEERINGGENERALSPECIFICATION
Thenetworkclocksshallbedesignedtoprovideyearsofreliableandmaintenancefreeserviceandshallbeconstructedof
allmetalenclosureswithhighimpact,UVstablelensestoensurestructuralintegrityandmaximumdurability.Awall
mountingbracket,orothermeans,
shallbeprovidedformountingtothesurfaceofawall.Thefinishofthenetworkclocks
shallbeofahighquality,durable,paintedtexturedpowdercoatfinishandavailableinachoiceofcolors.Thenetwork
clocksenclosureshallbeavailableinoptionalunpaintedstainlesssteelmaterialandfinish
forspecialapplications.
Thenetworkclocksshallbeavailableindoublefacedordualmountoptionsforapplicationsinhallwaysorcorridors.
Thenetworkclocksshallbedesignedforeasy,costeffective,andreliableinstallationandusestandardRJ45,10MB
Ethernetstyleconnectors.
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Accuracy:
Thenetworksclockdisplaysshallbe
accuratetowithin50millisecondsoftheUTCtimereferenceprovidedbytheNTP
server(s),whensynchronized.
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Protocol:
TheEthernetwiredclocksshallsupportthefollowingprotocols:
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SNTP,SimpleNetworkTimeProtocol
ThenetworkclocksshalloperatewithaninternalreferencetimethatissettoUTC(UniversalCoordinated
Time)viaa
built‐intheSNTPclient,fromuptotwoNTPtimeservers.Selectionoftheprimaryandsecondaryserversshallbeautomatic,
butconfigurablebyeitherstaticIPaddressorDHCPprovidedIPaddressconfigurationmethods.Thenetworkclocksshallbe
configurabletooperateasanSNTPclient
inthefollowingoperationalmodes:unicast(orquery),broadcast,or
multicast.
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DHCP,DynamicHostConfigurationProtocol
ThenetworkclocksshallutilizeDHCP(DynamicHostConfigurationProtocol),bydefault,asameansofautomatingthe
configurationofallrequirednetworksettingsutilizingtheoptionalsettingsareaofaDHCPserver.All
DHCPnetworkand
optionalNTPsettingsshallallowforenablingordisablingateachclock,inordertousestaticIPaddress
modenetworkandNTPsettings.
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Power:
ThenetworkclocksshallutilizeastandardizedPoweroverEthernet(POE)technologytopowertheclockincompliancewith
theIEEE802.3afPower
overEthernetspecification.Thenetworkclocksshallbeconsideredtobeandtooperateas
PoweredDevices(PD);andshallutilizea48VDCnominalvoltagesuppliedoverthespareEthernetnetworkcablepairs,
and/ortheshareddata/pairs,fromanIEEE802.3afcompliantPowerSourcingEquipment(PSE)device,witha
10/100MB
rating,foradistanceofupto100m(328ft).Powerconsumptionshallbelessthan12.95WattsmaximumforallPD
equipment.EachnetworkclockPDshallhaveatypicalpowerratingoflessthan7.5W.
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Thenetworkclocksshallbemadeavailablewithanoptional
ACpower.Thepowerinputshallbemadeasauniversaltype
withaninputpowerrangeof90‐264VAC,47‐63HzandutilizingastandardIECpowerjack.
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Connectors:
Ethernet10/100Base‐T:RJ45
ThenetworkclocksystemshallutilizestandardCat5orCat6cabling
forthedistributionofeitherdata,ordataandpower
usingthesamestandardcable,andeliminatingtheneedforanACpowersourceattheclocklocation.
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Configurationsettings:
ThetimedisplayedonthefaceofthenetworkclocksmayeitherbeUTCtimeorlocaltimeandshall
beconfigurablevia
software.ClockdisplaysshallofferflexibilitytoallowforanyinternationaltimezoneoffsetandautomaticDaylightSaving
Time(DST)adjustmentandshallprovidemaintenancefreereliableoperation.Configurationchangesshallberetainedin
non‐volatileflash.Thenetworkclocksshallutilizeaninternalmaintenancefreerechargeablebattery
backedreal‐timeclock
(RTC)toretaintheinternaltimeintheeventofapoweroutageorforconditionswhentheNTPserver(s)isnotavailable.
Thenetworkclocksshallnotdisplaythetimeduringapoweroutage,butshallrecoverfromsuchpoweroutageasa
systemwithout
intervention.Duringsuch“free‐wheeling”periodsandwhileinoperation,thenetworkclocksshallprovide
avisualindicationthatthedeviceisrelyingontheinternaloscillatorandisnotcurrentlysynchronizedtothenetwork
timeserver.
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2.3.2ANALOGCLOCKENGINEERINGSPECIFICATION
Theshapeoftheanalogclockshallberound12”
[30cm]or18”[46cm].Thefaceoftheclockshallbeoff‐white,thetime
indicationmarksonfaceshallbeblack.ThehourmarkingsshallbeinanArabicnumeralformatandinaneasilyreadfont.
Minute/secondmarkingshallbeprovided.Theanalogclockshallhaveblackhourandminutehandsandaredsecondhand
indicator.
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Theanalogclockshallcontainasteppermotordriveandstateoftheartmicroprocessorandelectronicscontroltorapidly
synchronizethehandsonthefaceoftheclocktoanaccurateNTP(NetworkTimeProtocol)reference.Thestepper
motor
driveandgearsystemshallbeofallmetalconstructionforlongmaintenancefreelifeandhighproductreliability.
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