Masterclock GMR5000 - PTP Port Data Set and Parameters; Port Data Set (portDS) Members

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MasterclockGMRUserManualv2–2016.12
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ptpTimescale–true,thecurrenttimescaleisthePTPdefault,TAItime.false,anothertimescaleis
beingused(suchasUTC).
timeSource–theGMRproductssupportthefollowingtimesourcevalues.Non‐GMRproducts
mayhaveadditionalvalues.
GPS–GPS/GNSSsatellitetime
PTP–PrecisionTimeProtocol
NTP–
NetworkTimeProtocol
OTHER–timecodereader,NMEA,NENA,etc.
INTERNAL_OSCILLATOR–internaloscillator
Thefollowingcanbemodified:
currentUtcOffset–offsetinsecondstoUTStime.
currentUtcOffsetValid–true,currentUtcOffsetoffsetvalueisvalidandcanbeused.false,
currentUtcOffsetisinvalidandcannotbeused.
leap59–
true,aleapsecondispending.false,noleapsecondispending.
leap61‐true,aleapsecondispending.false,noleapsecondispending.
5)portDS,PortDataSet
Selectwhichmembertomodify(1‐6),’x’togobackupalevel,‘?’forhelp
Thefollowingcannotbemodified:
portIdentity–portidentity
portState–master(deviceisthegrandmaster),slave(deviceisaslavetothegrandmaster),
passive(deviceisnotsynchronizingtothegrandmasterandcan
becomethegrandmaster).
peerMeanPathDelay–onlyusedwhenP2Pisenabled.
versionNumber–PTPversionnumber,always2forGMRproducts.
Thefollowingcanbemodified:
logAnnounceInterval–meantimeintervalbetweenAnnouncemessages.Usedintheselectionof
thegrandmaster.Thevalueislogarithmtothebase2.A
negativevalueisafractionalsecond.
Recommendedvalueis1,range0to4.
announceReceiptTimeout–timeoutinsecondsforthereceiptoftheannouncemessage.Must
begreaterthanthelogAnnounceInterval(inseconds).
logSyncInterval–intervalusedtosendSyncmessagesfromthegrandmaster.Thevalueis
logarithmtothe
base2.Anegativevalueisafractionalsecond.Recommendedvalueis1,range0
to4.
delayMechanism‐DelayMechanismisthemethodusedtocalculatethenetworkpathdelays.All
devicesonthenetworkmustusethesamedelaymechanism(eveniftheyareindifferentPTP
domains).End
ToEnd(E2E)onlyrequiresthemasterandslavetosupportPTP.Itdoesnot
requirethenetworkinfrastructuretosupportPTP.Iftheinterveninginfrastructureofthelocal
networkdoesnotsupportPTP,accuraciesof20‐100microsecondscantypicallybeachieved.If
theinterveningnetworkdevicesdoessupportE2E
PTP(ie.atransparentclock)sub‐microsecond
accuraciescanbeachieved.PeerToPeer(P2P)reducestheoverallnetworktrafficandcan