中英文文献翻译红外数据协会的一系列红外物理层规则.docx

中英文文献翻译红外数据协会的一系列红外物理层规则.docx

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中英文文献翻译红外数据协会的一系列红外物理层规则

1.Introduction

1.1.Scope

Thisphysicalspecificationisintendedtofacilitatethepoint-to-pointcommunicationbetweenelectronicdevices（e.g.,computersandperipherals）usingdirectedhalfduplexserialinfraredcommunicationslinksthroughfreespace.ThisdocumentspecifiestheopticalmediainterfacesforSerialInfrared（SIR）data

transmissionuptoandincluding115.2kbit/s,0.576Mbit/s,1.152Mbit/s,4.0Mbit/sand16Mbit/s.ItcontainsspecificationsfortheActiveOutputInterfaceandtheActiveInputInterface,andfortheoveralllink.ItalsocontainsAppendicescoveringtestmethodsandimplementationexamples.

Overthepastseveralyearsseveralopticallinkspecificationshavebeendeveloped.Thisactivityhasestablishedtheadvantagesofopticalinterfacespecificationstodefineopticallinkparametersneededtosupportthedefinedlinkperformanee.Opticalinterfacespecificationsareindependentoftechnology,applyoverthelifeofthelinkandarereadilytestableforconformanee.TheIrDAserialinfraredlinkspecificationsupportslowcostoptoelectronictechnologyandisdesignedtosupportalinkbetweentwonodesfrom0toatleast1meterapart（20cmforlowpowerparts:

pleaseseeSection4.1）asshowninFigure1（thetwoportsneednotbeperfectlyaligned）.

Node2

Figure1SchematicViewoftheOpticalInterfacePortGeometry

1.2.References

Thefollowingstandardseithercontainprovisionsthat,throughrefereneeinthistext,constituteprovisionsofthisproposedstandard,orprovidebackgroundinformation.Atthetimeofpublicationofthisdocument,theeditionsanddatesoftherefereneeddocumentsindicatedwerevalid.However,allstandardsaresubjecttorevision,andpartiestoagreementsbasedonthisproposedstandardareencouragedtoinvestigatethepossibilityofapplyingthemostrecenteditionsofthestandardslistedbelow.

IrDA（InfraredDataAssociation）SerialInfraredLinkAccessProtocol（IrLAP）,Version

1.1,June16,1996.

IrDA（InfraredDataAssociation）SerialInfraredLinkManagementProtocol,IrLMP）,Version1.1,January23,1996.

IrDA（InfraredDataAssociation）SerialInfraredPhysicalLayerMeasurement

Guidelines,Version1.0,January16,1998.

IrDA（InfraredDataAssociation）IrMCSpecification,Version1.0.1,January10,1998.

2.GeneralDescription

2.1.Point-to-PointLinkOverview

Theserialinfraredlinksupportsopticallinklengthsfromzerotoatleast1meterwithstandardpowertransceivers（20cmforlowpowertransceivers:

seesection4.1）foraccurate（withinspecifiedbiterrorratio）,freespacecommunicationbetweentwoindependentnodes（suchasacalculatorandaprinter,ortwocomputers）.

2.2.Environment

TheOpticalInterfaceSpecificationsapplyoverthelifeoftheproductandovertheapplicabletemperaturerangefortheproduct.BackgroundlightandelectricfieldtestconditionsarepresentedinAppendixA.

2.3.ModulationSchemes

Fordataratesuptoandincluding1.152Mbit/s,RZImodulationschemeisused,anda

“0”isrepresentedbyalightpulse.Forratesuptoandincluding115o2ks,theopticalpulsedurationisnominally3/16ofabitduration（or3/16ofa115.2kbit/sbitduration）.ForO.576Mbit/sand1.152Mbit/s,theopticalpulsedurationisnominally1/4ofabitduration.

For4.0Mbit/s,themodulationschemeis4PPM.Init,apairofbitsistakentogetherandcalledadatasymbol.Itisdividedinto4“chips”,onlyoneofwhichcontainsan

pulse.For4.0Mbit/s,thenominalpulseduration（chipduration）is125ns.A“1”representedbyalightpulse.

For16.0MbiL匕transmission,theHHH（1,13）codeQalowdulycycle,rate2\（dk）—（1,13）runlengthlimited（RLL）codeZisusedastlicmodulationcodetoachievethe

specifieddatarate.TheHHH（1,13）codeguaranteesforatleastoneemptychipandatmost13emptychipsbetweenchipscontainingpulsesinthetransmittedIRsignal.

The16.0Mbit/sratepacketframestructureisbasedonthecurrentIrDA-FIR（4.0Mbit/s）frameformatwithmodificationsintroducedwherenecessarytoaccommodatetherequirementsthatarespecifictothenewmodulationcode.Furthermore,theHHH（1,13）codeisenhancedwithasimplescrambling/descramblingschemetofurtheroptimizethedutycycle.

3.MediaInterfaceDescription

3.1.PhysicalRepresentation

AblockdiagramofoneendofaserialinfraredlinkisshowninFigure2.Additionalsignalpathsmayexist.Becausetherearemanyimplementationalternatives,thisspecificationonlydefinestheseriallyencodedopticaloutputandinputsignalsat[3].

Inthediagram,theelectricalsignalstotheleftoftheEncoder/Decoderat[1]areserial

bitstreams.Fordataratesuptoandincluding1.152Mbit/s,theopticalsignalsat[3]arebitstreamswitha"0"beingapulse,anda"1"isabitperiodwithnopulse.For4.0Mbit/s,a4PPMencodingschemeisused,witha“1”beingapulseanda“0”

chipwithnopulse.For16.0Mbit/s,aHHH（1,13）,（d,k）=（1,13）runlengthlimited（RLL）,lowdutycycle,rate2/3modulationcodeisused.TheHHH（1,13）codeguaranteesforatleastoneemptychipandatmost13emptychipsbetweenchipscontainingpulsesinthetransmittedIRsignal.AsummaryofpulsedurationsforallsupporteddataratesappearsinTable2inSection4.1.

Theelectricalsignalsat[2]aretheelectricalanalogsoftheopticalsignalsat[3].Fordataratesuptoandincluding115.2kbit/s,inadditiontoencoding,thesignalat[2]isorganizedintoframes,eachbyteasynchronous,withastartbit,8databits,andastopbit.Animplementationofthis（upto115.2kbit/s）isdescribedinAppendixB.Fordataratesabove115.2kbit/s,dataissentinsynchronousframesconsistingofmanydatabytes.DetailoftheframeformatisfoundinSection5.

Figure2.IRTransducerModule

3.2.OpticalAngleDefinitions

Theopticalaxisisassumedtobenormaltothesurfaceofthenode'sfacethatcontainstheopticalport（SeeFigure3）.Forconvenience,thecenteroftheopticalportistakenasthereferencepointwheretheopticalaxisexitstheport.Ifthereisasymmetry,aslongasthemaximumhalfangleofthedistributionisnotgreaterthantheallowableHalf-AngleRangemaximum,andtheminimumhalfangleofthedistributionisnotlessthantheHalf-AngleRangeminimum,theHalf-AngleRangespecificationismet.

4.MediaInterfaceSpecifications

4.1.OverallLinks

Therearetwodifferentsetsoftransmitter/receiverspecifications.Thefirst,referredtoasStandard,isforalinkwhichoperatesfrom0toatleast1meter.Thesecond,referredtoastheLowPowerOption,hasashorteroperatingrange.Therearethreepossiblelinks（SeeTable1below）:

LowPowerOptiontoLowPowerOption,StandardtoLowPowerOption;StandardtoStandard.Thedistanceismeasuredbetweentheopticalreferencesurfaces.

LewPower-LewPowver

Standard-LwPower

Standard-

Standard

LinkDistanceLwerLimit,metera

D

0

0

MinimumLinkDistanceUpperLimit,meters

0.2

0.3

10

Table1LinkDistanceSpecifications

TheBitErrorRatio（BER）shallbenogreaterthan10A-8.ThelinkshalloperateandmeettheBERspecificationoveritsrange.

SignalingRateandPulseDurationAnIrDAserialinfraredinterfacemustoperateat9.6kbit/second.Additionalallowablerateslistedbelowareoptional.SignalingrateandpulsedurationspecificationsareshowninTable2.

Forallsignalingratesuptoandincluding115.2kbit/stheminimumpulsedurationisthesame（thespecificationallowsbotha3/16ofbitdurationpulseandaminimumpulsedurationforthe115.2kbit/ssignal（1.63microsecondsminusthe0.22microsecondtolerance））.Themaximumpulsedurationis3/16ofthebitduration,plusthegreaterofthetoleranceof2.5%ofthebitduration,or0.60microseconds.

For0.576Mbit/sand1.152Mbit/s,themaximumandminimumpulsedurationsarethenominal25%ofthebitdurationplus5%（tolerance）andminus8%（tolerance）ofthebitduration.

For4.0Mbit/s,themaximumandminimumsinglepulsedurationsarethenominal25%ofthesymboldurationplusandminusatoleranceof2%ofthesymbolduration.

For4.0Mbit/s,themaximumandminimumdoublepulsedurationsare50%ofthesymbolplusandminusatoleraneeof2%ofthesymbolduration.Doublepulsesmayoccurwhenevertwoadjacentchipsrequireapulse.

For16Mbit/s,themaximumandminimumsinglepulsedurationsarethenominalsymboldurationplusandminusatoleranceof8%ofthenominalsymbolduration.

ThelinkmustmeettheBERspecificationoverthelinklengthrangeandmeettheopticalpulseconstraints.

SignalingRate

Modulation

RateTolerance%ofRate

PulseDurationMinimum

PulseDuration

Nomnai

PtilseDuration

Maximum

2.4KbltfS

R3

+7-0.S7

141LIS

7813ps

8855iis

96K沁

R3

+/-0.S7

1.41ps

1953us

2213iis

192kbiVs

RZJ

+/-0S7

1.41LIS

9.77its

11.07lis

3&4kbit/s

R3

+/-0B7

1.4-1PS

4.S8its

596US

57.6kbit/5

R3

+/-007

1.41两

3.2Blis

4.342

1152kbit/s

RZ1

+/-087

1.41ps

1.63ilis

2.23卜is

□.576Mbit/s

Ra

+/-0.1

295.2ns

434□ns

520.8ns

1.152Mbit/s

Ra

+/-□1

147.6ns

2170ns

260.4ns

4.0Mbrt/s

（singleputse）

4PPM

+/-0.01

115.0ttS

1250ns

135.0ns

（doublepulse}

4PPM

+/-0.01

240.0ns

2500rte

260.0ns

16.Dr-.1bit/s

+/-0.01

38.3ns

417ns

450ns

Table2Si^-ialingRateandPulseDurationSpecifications

Inordertoguaranteenon-disruptivecoexistencewithslower（115.2kbit/sandbelow）systems,onceahigherspeed（above115.2kbit/s）connectionhasbeenestablished,thehigherspeedsystemmustemitaSerial