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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NTPisanopenstandardInternetprotocolthatutilizes
standardethernetwiringtosynchronizecomputers,clocks,
networksandothersystemstoaNTPreferenceserver.The
signalcanbetransmittedoverLANandWANwirednetworks
andovervariouswirelesssystems.
TherearenumerouspublicsourcesofNTPavailable.Many
universities
andgovernmentalagenciesprovideaccesstoNTP
servers.Duetotheincreasingnumberofrequests,some
facilitiesarelimitingaccess,andinsomecaseschargingaccess
fees.
NTPservicecanbeestablishedonyourinternalnetworkusinga
stand‐alonedevicesuchastheNTP100,whichandgenerates
NTPfromatomicclocks
inGPSsatellites.GPSreceivercards
suchastheGPSPCIcanalsoprovidealocalNTPreference
source.InmanycasesalocalNTPserveristherecommended
approach,duetocomputerfirewallsandothernetwork
constraints.Inmanycasesthisprovidesamoreaccurateand
availableNTP.
Accuracyof
timeinatypicalNTPinstallationwilldependon
manyfactors,butitistypicallybetterthanonehalf‐second
afteroneyearwithoutGPS.
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TimeCodeisalowpoweraudiosignalsimilartothesignal
ofamodem.Itcontainstimeanddateinformation.Transmitted
overinexpensivecoaxialcableandwiring,suchastelephone
pairs,TimeCodewirescanbeconnectedinparalleltomultiple
clocksandcomputers.Withtheproperdistributionamplifiers
(likethe
TCA100)TimeCodecanbesentoverlongdistances
andconnectedinparalleltohundredsofclocksandother
devices.Itisgenerallyaninexpensive,robustandreliable
meansofdistributingtimeanddatearoundalocalplantor
operation.
TherearemanyvariationsofTimeCode.Ourproducts
generate,amplify,
anddistributeSMPTEandEBUTimeCodefor
film,video,andaudioproductionandgenerate,amplifyand
distrubuteIRIGTimeCodeforgovernment,military,and
commercialapplications.
WithanaccurateTimeCodesourcesuchastheGPS500anda
TimeCodereadercardsuchastheTCR500alocalsystem
can
besynchronizedtowithin20or30millisecondslimitedonlyby
thesoftwareoperatingsystem.
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Information
NTP and Time Code Explained