Masterclock TCR1000 Spezifikationen PDF herunterladen (Seite 81)

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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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.



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.



102

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NTP and Time Code Explained

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