鐵路數(shù)字移動通信系統(tǒng)(GSM-R)機(jī)車綜合無線通信設(shè)備-GlobalSystemforMobileCommunicationsRailway（GSMR）CabIntegratedRadioCommunicationEquipment

RAILWAYINDUSTRYSTANDARD

OFTHEPEOPLES'REPUBLICOFCHINA

GlobalSystemforMobileCommunications-Railway—

(GSM-R)

CabIntegratedRadioCommunicationEquipment

TB/T3375-2018

'

IssuedbyNationalRailwayAdministrationofthePeoplesRepublicofChina

IssuedDate:July16,2018

ValidDate:February1,2019

ChinaRailwayPublishingHouseCo.,Ltd.

Beijing2022

圖書在版編目CIP數(shù)據(jù)

()

鐵路數(shù)字移動通信系統(tǒng)機(jī)車綜合無線通信設(shè)備

(GSM-R):

英文國家鐵路局編著北京中國鐵道

TB/T3375-2018:/.—:

出版社有限公司

,2022.2

ISBN978-7-113-28767-2

鐵中鐵路通信無線電通信通信

Ⅰ.①…Ⅱ.①…Ⅲ.①--

設(shè)備行業(yè)標(biāo)準(zhǔn)中國英文

---Ⅳ.①U285.21-65

中國版本圖書館數(shù)據(jù)核字第號

CIP(2022)008333

'

ChineseversionfirstpublishedinthePeoplesRepublicofChinain2018

'

EnglishversionfirstpublishedinthePeoplesRepublicofChinain2022

byChinaRailwayPublishingHouseCo.,Ltd.

'

No.8,YouanmenWestStreet,XichengDistrict

Beijing,100054

PrintedinChinabyBEIJINGCONGREATPRINTINGCO.,LTD.

'

?2018byNationalRailwayAdministrationofthePeoplesRepublicofChina

Allrightsreserved.Nopartofthispublicationmaybereproducedortransmittedinanyformor

byanymeans,electronicormechanical,includingphotocopying,recording,orbyany

informationstorageandretrievalsystems,withoutthepriorwrittenconsentofthepublisher.

Thisbookissoldsubjecttotheconditionthatitshallnot,bywayoftradeorotherwise,

'

belent,resold,hiredoutorotherwisecirculatedwithoutthepublisherspriorconsent

inanyformofbindingorcoverotherthanthatinwhichitispublishedandwithouta

similarconditionincludingthisconditionbeingimposedonthesubsequentpurchaser.

ISBN978-7-113-28767-2

IntroductiontotheEnglishVersion

TopromotetheexchangeandcooperationinrailwaytechnologybetweenChinaandtherestof

theworld,PlanningandStandardResearchInstituteofNationalRailwayAdministration,

'

entrustedbyNationalRailwayAdministrationofthePeoplesRepublicofChina,organizedthe

translationandpreparationofChineserailwaytechnologyandproductstandards.

GlobalSystemforMobileCommunications-

ThisstandardistheofficialEnglishversionof

RailwayGSM-RCabIntegratedRadioCommunicationEquipment

()—(TB/T3375-2018).The

originalChineseversionofthisstandardwasissuedbytheNationalRailwayAdministrationofthe

'

PeoplesRepublicofChinaandcameintoeffectonFeburary01,2019.Incaseofdiscrepancies

betweenthetwoversions,theChineseversionshallprevail.NationalRailwayAdministrationof

'

thePeoplesRepublicofChinaownsthecopyrightofthisEnglishversion.

Yourcommentsareinvitedfornextrevisionofthisstandardandshouldbeaddressedto

TechnologyandLegislationDepartmentofNationalRailwayAdministrationandPlanningand

StandardResearchInstituteofNationalRailwayAdministration.

Address:TechnologyandLegislationDepartmentofNationalRailwayAdministrationatNo.6

FuxingRoad,Beijing100891,P.R.China.

PlanningandStandardResearchInstituteofNationalRailwayAdministrationatBlockB,

JianGongBuilding,No.1,GuanglianRoad,XichengDistrict,Beijing,100055,P.R.China.

ThetranslationwasperformedbyFanTingting,Wangjin,XuhuiandLixue.

ThetranslationwasreviewedbyShiBo,MuJiancheng,ChenSong,DiShiping,WangYuqiang,

HuangShuangningandWangLingling.

1

NoticeofNationalRailwayAdministrationonIssuingtheEnglishVersionof

EightChineseRailwayTechnicalStandardsincludingTechnical

SpecificationforLayingofHighSpeedTurnoutsforSlabTrack

DocumentGTKF〔2021〕No.33

TechnicalSpecificationforLayingofHigh

EightChineserailwaytechnicalstandardsincluding

SpeedTurnoutsforSlabTrack

(TB/T3302-2013)areissued.Incaseofdiscrepanciesbetweenthe

twoversions,theChineseversionshallprevail.

ChinaRailwayPublishingHouseisauthorizedtopublishanddistributetheEnglishversionof

thesestandards.

AttachedhereisalistoftheEnglishversionofthesestandards.

S/NChinesetitleEnglishtitleStandardnumber

高速鐵路無砟軌道道岔鋪設(shè)技

TechnicalSpecificationforLayingofHighSpeedTurnouts

1術(shù)條件TB/T3302-2013

forSlabTrack

高速鐵路有砟軌道道岔鋪設(shè)技

TechnicalSpecificationforLayingofHighSpeedTurnouts

2術(shù)條件TB/T3306-2013

forBallastedTrack

客運(yùn)專線鋼軌伸縮調(diào)節(jié)器

3RailExpansionJointofPassengerDedicatedLineTB/T3401-2015

客貨共線鐵路鋼軌伸縮調(diào)節(jié)器RailExpansionJointofMixedPassengerandFreight

4TB/T3518-2018

Railway

彈性支承塊式無砟軌道部件

5第部分混凝土支承塊LowVibrationTrackComponents—Part1:ConcreteBlockTB/T3515.1-2018

1:

鐵路橋梁鋼支座

6SteelBearingsforRailwayBridgeTB/T1853-2018

鐵路數(shù)字移動通信系統(tǒng)

(GSM-R)GlobalSystemforMobileCommunications-Railway(GSM-

7設(shè)備機(jī)車綜合無線通信設(shè)備TB/T3375-2018

R)—CabIntegratedRadioCommunicationEquipment

集中聯(lián)鎖結(jié)合電路一般原則GeneralPrinciplesforCombinedCircuitofCentralized

8TB/T2307-2017

Interlocking

'

NationalRailwayAdministrationofthePeoplesRepublicofChina

October28,2021

3

Contents

………………

ForewordⅢ

………………

1Scope1

………………

2NormativeReferences1

………………………

3Abbreviations2

…………

4EquipmentCompositionandStructureRequirements2

………………

5EquipmentFunctions4

………………………

6PerformanceRequirements6

……………

7InterfaceRequirements8

………………………

8TestMethods8

………

9Sign,Packaging,TransportandStorage18

…………

AnnexA(Informative)CIRInstallationRequirements19

Ⅰ

Foreword

ThisstandardisdraftedinaccordancewiththerulesgiveninGB/T1.1-2009.

ThisstandardispreparedbyCRSCResearch&DesignInstituteGroupCo.,Ltd.

ThisstandardisdraftedbySignal&CommunicationResearchInstituteofChinaAcademyof

RailwaySciences,ShanghaiCo.,Ltd.ofCRSCCommunication&InformationGroupCompany

Ltd.,Tianjin712Communication&BroadcastingCo.,Ltd.andBeijingCenturyEastCommunications

EquipmentCo.,Ltd.

ThisstandardismainlydraftedbyChenSong,WangZuyuan,YuJian,HuangZhigang,

XiongDaoquan,JiangZhiyong,DongChengwen,ZhangYujin,ZhouFeng,ZouHuayongand

YanXiaosheng.

Ⅲ

GlobalSystemforMobileCommunications-Railway

(GSM-R)

—CabIntegratedRadioCommunicationEquipment

1Scope

Thisstandardspecifiestheequipmentcompositionandstructurerequirements,equipmentfunctions,

performancerequirements,interfacerequirements,testmethods,aswellassigns,packagings,

transportationsandstoragesofcabintegratedradiocommumicationequipment(CIR).

Thisstandardisapplicabletotheproductdesign,manufacturingandtestofCIRinstalledon

differenttypesofcabs,EMUsandspecialequipmentoperatingbyitsownwheelset.

2NormativeReferences

Thefollowingreferenceddocumentsareindispensablefortheapplicationofthisdocument.For

datedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthe

referenceddocument(includinganyamendments)applies.

Packaging-Pictorialmarkingforhandlingofgoods

GB/T191

GeneraltolerancesTolerancesforlinearandangulardimensionswithoutindividual

GB/T1804

toleranceindications

EnvironmentaltestingforelectricandelectronicproductsPart2Testmethods

GB/T2423.1—:—

TestsACold

:

EnvironmentaltestingforelectricandelectronicproductsPart2Testmethods

GB/T2423.2—:—

TestsBDrHeat

:y

EnvironmentaltestingforelectricandelectronicproductsPart2Testing

GB/T2423.3—:

methodsTestCabDamheatsteadstate

—:p,y

DegreesofprotectionprovidedbyenclosureIPcode

GB/T4208-2017()(IEC60529:2013,

IDT)

Safetyrequirementsforradiotransmittingequipment

GB9159

MethodsofmeasurementforradiotransmittersemployingF3Eemissionusedin

GB/T12192

themobileservices

MethodsofmeasurementforradioreceiversemployingF3Eemissionusedinthe

GB/T12193

mobileservices

GeneralspecificationforradiotransceiveremployingF3Eemissionused

GB/T15844.1-1995

inthemobileservices

RailwayapplicationsRollingstockequipmentShockandvibrationtests

GB/T21563——

RailwayapplicationsElectromagneticcompatibilityPart3-2Rollingstock

GB/T24338.4——:—

Apparatus

Technicalspecificationonradiocommunicationfortraincontrol

GB/T28792-2012

GSM-Rdigitalmobilecommunicationsystemapplicationserviceradiotransmission

TB/T3231

systemforrailwaytrafficcontrolcommandinformation

OnboardradiocommunicationmoduleofGlobalSystemforMobilecommunication-

TB/T3370.1-2018

RailwaGSM-RPart1Technicalseciication

y()—:pf

·1·

GlobalSystemforMobilecommunication-RailwayGSM-Rapplicationservice

TB/T3379()—

Dispatchingcommunication

Methodsof9001800MHzTDMADigitalCellularMobileTelecommunication

YD/T1215/

NetworkGeneralPacketRadioServiceGPRSEuimentMobileStations

()qp:

3Abbreviations

Thefollowingabbreviationsareapplicabletothisstandard.

CIR:CabIntegratedRadioCommunicationEquipment

CTC:CentralizedTrafficControl

DMS:TheDynamicMonitoringSystemofTrainControlEquipments

EOAS:ElectricMultipleUnitsOperationAnalysisSystem

GPRS:GeneralPacketRadioService

GRIS:GPRSInterfaceServer

GROS:GPRShOmeInterfaceServer

GSM:GlobalSystemforMobilecommunications

GSM-R:GSM-Railway

MMI:ManMachineInterface

MTBF:MeanTimeBetweenFailure

SIM:SubscriberIdentificationModule

4EquipmentCompositionandStructureRequirements

4.1EquipmentComposition

CIRconsistsofhost,MMI,handset,printingterminal,loudspeaker,cabdataacquisitionencoder

(hereafterreferredtoasencoder),connectingcable,antenna,feedercablesandcombiner,etc.,of

whichtheencoderisinstalledwithincabsafetyinformationintegratedmonitoringdevice(TAX).

SchematicdiagramofequipmentcompositionisasshowninFigure1.

Figure1SchematicdiagramofCIRequipmentcomposition

4.2StructureRequirements

4.2.1BasicRequirements

Equipmentstructureshallconformtothefollowingbasicrequirements:

a)Thestructureshallbecompact,thecomponentshallbesolidanddurable.

·2·

b)StandardsimplifiedChineseshallbeusedforLogotype.

c)Easyforoperation,convenientformaintenanceandtesting,withnecessarymaintenanceinterfaces.

d)EquipmenthostandMMIshallbeexcellentinheatdissipation.Thedustproofandwaterproof

levelofthehostshallconformtotherequirementsofIP40ofGB/T4208-2017.The

dustproofandwaterprooflevelofMMIshallconformtotherequirementsofIP42ofGB/T

4208-2017.

e)Unmarkedtoleranceofequipmentstructuredimensionshallconformtotherequirementsof

GB/T1804.

4.2.2InstallationRequirements

RefertoAnnexAforCIRinstallationrequirements.

4.3MMIDisplayRequirements

4.3.1Maininterface

Thedisplayofmaininterfaceshallconformtothefollowingrequirements:

a)Thedisplayofmaininterfacedividesintobasicinformationzone,end-of-train(EOT)state

zone,safetywarningzone,workingmodeandoperatinglinezone,dispatchingcommunication

statezoneandfunctionalbuttonzone.SeeFigure2forlayoutofeachzone.

Figure2Schematicdiagramoflayoutforeachzoneofmaininterface

b)Basicinformationzonedisplaysloudspeakervolume(on-hook)orearphone(off-hook),train

number,enginenumber,GPRSworkingstate,receivingsignalfieldstrengthindicationof

GSM-Rvoiceunit.Basicinformationzonedisplaysregistrationandderegistrationstateof

trainfunctionalnumberandenginefunctionalnumberunderGSM-Rworkingmode.

c)EOTstatezonedisplaysconnectingstateandwindpressureinformationofEOT.Itshallalso

displaypassengerEOTIDandotherinformationforpassengertrain.

d)Safetywarningzonedisplayssafetywarninginformationandstateandtimeofsatellitepositioning

unit.

e)Workingmodeandoperatinglinezonedisplaysworkingways,linenames,operatingsections,

workingmodesandotherinformation.

f)Dispatchingcommunicationstatezonedisplaysstateinformationsuchasoutgoing,incoming

andcallingandotherstateofdispatchingcommunication.Thetransmittingandreceivingstate

of450MHzcabradiounitshallbedisplayedunder450MHzworkingmode.

4.3.2DisplayInterfaceofDispatchingCommands

Thedisplayinterfaceofdispatchingcommandsshallconformtothefollowingrequirements:

a)MMIdispatchingcommanddisplayinterfacedividesintoinformationzoneandmainbody

contentsarea,seeFigure3.

·3·

b)Informationareadisplaysvouchername,dispatchingcommandnumber,issuingsector,issuing

timeofdispatchingcommand,trainnumber,signingstateofdispatchingcommand,etc.

c)Mainbodycontentsareashalldisplaymainbodycontents,signingtimeandsigninglocation

andotherinformationofdispatchingcommands.

Figure3Schematicdiagramofzonelayoutfordispatchingcommands

5EquipmentFunctions

5.1SelectionsofWorkingTypes

Selectionfunctionofworkingtypesshallbeprovided,whichcanbesetas"manual"or"automatic"way,

anddisplayedinzoneofMMIworkingmodeandoperatingline.

5.2SelectionsofWorkingModes

Settingfunctionofworkingmodesshallbeprovided,whichcanbesetas"GSM-Rworkingmode"

or"450MHzworkingmode",anddisplayedinzoneofMMIworkingmodeandoperatingline.

5.3PoweronInitialization

5.3.1

WhensingleMMIisconfigured,MMIshallenterintomaincontrolorsecondarycontrolstate

automaticallyaccordingtothesettingafterpoweron.

5.3.2

WhendualMMIisconfigured,MMIshallenterintosecondarycontrolstateafterpoweron.

5.3.3

Afterstart-up,CIRshallmaintainthesameworkingwaysandmodesastheonebeforeshut-

down.Whenworkingwayis"automatic",workingmodeisdeterminedaccordingtooutputinformationof

satellitepositioningunit.

5.3.4

TheprocessesofGSM-Rnetworkregistration,PDPactivatingandIPaddressacquisitionof

GSM-RdataunitarecarriedoutautomaticallyunderGSM-Rnetworkcoverage.

5.3.5

Whensatellitepositioninginformationiseffective,CIRsystemtimecancalibrateautomatically

accordingtosatellitepositioninginformation.

5.4Functionsof450MHzWorkingMode

5.4.1

Support450MHztrainradiodispatchingcommunicationfunction,conformtorelativeprovisionsin

GB/T28792-2012.

5.4.2

Support450MHzradiotransmittingfunctionofdispatchingcommand,conformtotherequirements

ofTB/T3231.

5.4.3

Support450MHzradiotransmittingfunctionoftrainnumbercheckingdata.

5.4.4

Havethefunctionoftrainnumbersetting.

5.4.5

Havethefunctionoftrainnumbermanualacknowledgement.

5.4.6

Havethefunctionofoperatingsectionselection.

5.4.7

Havethefunctionofoperatinglineselection.

·4·

5.5FunctionsofGSM-RWorkingMode

5.5.1

Havethefunctionoftrainfunctionnumberregistrationandderegistration.

5.5.2

Havethefunctionofcabfunctionnumberregistrationandderegistration.

5.5.3

SupportGSM-Rdispatchingcommunictionfunction,conformtotherequirementsofTB/T3379.

5.5.4

SupportGPRSradiotransmittingfunctionofdispatchingcommandinformation,conformto

therequirementsofTB/T3231.

5.5.5

SupportGPRStransmittingfunctionoftrainradiotrainnumbercheckingdata.

5.5.6

Havethefunctionoftrainnumbermanualacknowledgement.

5.5.7

Havethefunctionofoperatingsectionselection.

5.5.8

Havethefunctionofoperatinglineselection.

5.6TrainProtectionAlarm

5.6.1

Havethefunctionofsendingandreceivingtrainprotectionalarminformationwithaudibleand

visualprompt.

5.6.2

Havethefunctionofreceivinglevelcrossingalarminformationandconstructionprotectionalarm

informationwithaudibleandvisualprompt.

5.6.3

Havethefunctionofsendingtrainapproachingwarninginformation.

5.6.4

Havethefunctionofrecording,queryinganddownloadingoftrainprotectionalarm,level

crossingalarmandconstructionprotectionalarminformation.

5.7SafetyProtectionInformationTransmissionofPassengerEOT

5.7.1

HavethefunctionofsendingconnectingrequeststosafetyprotectiondeviceofpassengerEOT

(KLW).

5.7.2

HavethefunctionofsendingmanualandautomaticquerywindpressuretoKLW.

5.7.3

HavethefunctionofcontrollingKLWexhaustingforbrake.

5.7.4

HavethefunctionofsendingdisconnectingrequesttoKLWandreleasing"one-to-one"connecting

relation.

5.7.5

Havethefunctionofreceivingwindpressureauto-promptingandpowersupplyvoltageunder-

voltagepromptingwithaudibleandvisualpromptsentbyKLW.

5.7.6

Havethefunctionofrecording,queryinganddownloadingofsafetyprotectioninformationof

passengerEOT.

5.8In/Ex-warehouseTest

5.8.1

Haveself-testfunctionofcompletemachineandfailurepositioning.Thefailuremaybelocated

tounitmodule.

5.8.2

Havefunctionsofstarting-upself-testthroughMMIandthereceivedtelemeteringcommand

ofdeparture-returningtestequipment,andsendingbacktestresults.Testitemsatleastinclude

workingstateofGSM-Rvoiceunit,GSM-Rdataunit,satellitepositioningunit,encoder,450MHz

cabradiounit,trainprotectionalarm(LBJ)unit,recordtransferunit,MMIandbatteryunit.

5.8.3

Havefunctionsofmanualtestincooperationwithdeparture-returningtestequipment.Test

itemsatleastincludeGPRSdata,450MHzdata,450MHzsamefrequencycalling,450MHzdifferent

frequencycalling,GSM-Rcalling,recordtransferunit,trainprotectionalarm(LBJ)unitandsafety

protectioninformationtransmissionofpassengerEOT.

5.9Setting

5.9.1

Haveaddressbookqueryfunction.

5.9.2

Havethefunctionforvolumeadjustmentsofloudspeakerandearphoneandbrightnessadjustments

ofdisplayer.

·5·

5.9.3

Havethefunctionofmanualsettingofenginenumberandengineterminalnumber,etc.

5.9.4

Havethefunctionofpasswordprotectionofmaintenanceinterface.

5.9.5

HavethefunctionforsettingoftelephoneandIPaddressofexaminationindepot.

5.9.6

Havethefunctionfortheenquiryofsoftwareversionnumberofmainfunctionunit.

5.9.7

HavethefunctionofmanualcalibrationofCIRsystemtime.

5.9.8

Havethefunctionforrecordandoutputofvoice,dataserviceandstateinformation.

5.9.9

HavestatequeryfunctionsreceivingsignalstrengthofGSM-RvoiceunitandGSM-Rdata

unit,workingstateofsatellitepositioningunit,currenttimeofthesystem,batterystate,localIP

addressandotherinformation.

5.10ShutdownDeregistration

5.10.1

Havethefunctionforderegistrationoftrainfunctionalnumber,enginefunctionalnumber

andnetworkderegistrationfromGSM-Rnetworkautomatically.

5.10.2

HavethefunctionforderegistrationofIPaddressandnetworkderegistrationfromGPRS

networkautomatically.

5.10.3

Havethefunctionfordischargevoltagetestofbatteryunitandbatteryoverchargeprotection.

5.11InternalCalling

HavecommunicationfunctionbetweenmainandsecondaryMMI.

5.12ManualSystemResetting

Havemanualsystemresettingfunction.

6PerformanceRequirements

6.1RequirementsofPowerSupplyandPowerConsumption

6.1.1Powersupply

PowerunitmayadapttoDCpowersupplyconditionofdifferenttypesofpowersupply(battery),

U

ratedvoltage(n)is24V,48V,72V,96Vand110V,toadaptpowersupplyconditionbyselecting

differenttypesofpowersupplyunit.

Powersupplyconditionadaptedbypowersupplyunitistheminimumworkingvoltageof

UU

0.6nandmaximumworkingvoltageof1.4n.

6.1.2Powerconsumption

Undernormaloperation,thetotalpowerconsumptionofthecompletemachineisnotmorethan

300W,andthemaximumstart-upinstantaneouspowerconsumptionisnotmorethan3000W.

6.1.3Battery

NominalvoltageofbatteryunitisDC12V.

Batterycapacityshallbenolessthan3.3A·h.

6.2GSM-RVoiceUnit

ShallconformtotechnicalrequirementsofClassⅠmoduleinTB/T3370.1-2018.

6.3GSM-RDataUnit

ShallconformtotechnicalrequirementsofClassⅢmoduleinTB/T3370.1-2018.

6.4SatellitePositioningUnit

Satellitepositioningunitshallconformtothefollowingrequirements:

a)Numberofreceivedchannel:nolessthan12.

b)Receivingsensitivity:superiorto-158dBm.

c)Powersupplyvoltageofantennaport:5V±0.5V.

d)Horizontalpositioningaccuracy:nolessthan10m(95%).

·6·

e)Initialpositioningtime(90%):

1)Hotstart(withstoredinformationsuchasheavenlycalendar,position,date,timeand

ephemeris):lessthan5s.

2)Warmstart(withstoredinformationsuchasheavenlycalendar,position,dateandtime):

lessthan40s.

3)Coldstart(withoutstoredinformation):lessthan60s.

f)Satelliterecapturingtime:nomorethan2s.

g)Outputintervalofpublicpositioninginformationofsatellitepositioning:nomorethan2s.

h)Outputintervaloforiginalinformationofsatellitepositioning:nomorethan2s.

6.5450MHzCabRadioUnit

Performanceindexesoftransmitterandreceiverof450MHzcabradiounitshallconformtothe

requirementsconcerningcabradioinGB/T28792-20127.1-7.5.

6.6LBJUnit

PerformanceindexesoftransmitterandreceiverofLBJunitshallconformtotherequirements

concerningcabradioinGB/T15844.1-1995.

6.7MMI

6.7.1MMIdisplayscreen

Displayscreenshallconformtothefollowingrequirements:

a)Screensize:5.7inches.

b)Resolution:nolessthan320×240pixels.

c)Displaycolournumber:nolessthan65536.

d)Contrast:nolessthan350∶1.

2

e)Brightness:nolessthan350cd/m.

6.7.2MMIloudspeaker

RatedaudiooutputpowerofMMIloudspeaker:0.5W-5Wadjustable.

6.8Loudspeaker

Loudspeakershallconformtothefollowingrequirements:

a)Impedance:8Ω.

b)Ratedpower:nolessthan5W.

6.9PrintTerminal

Printterminalshallconformtothefollowingrequirements:

a)Maxmiumprintingpowerconsumption:lessthan10W.

b)Printingspeed:nolessthan0.7row/s.

c)Printingcharacters:nolessthan12Chinesecharacters/row.

6.10Handset

Handsetshallconformtothefollowingrequirements:

a)AudiooutputofMMIinterface:level(effectivevalue)245mV(196mV-294mV),impendanceis

nomorethan600Ω;level(eff