ToVoiceProjectDateSeptember30,1983FromL.StewartLocationPARCSubjectLarkRegistrationOrganizationCSLXEROXIntroductionAnEPROMfortheLarkhasbeendevelopedthatallowsthemachinetooperatestand-alonewithoutEthernetsupport.ThisEPROMisintendedforuseduringtelephoneregistrationtestingoftheLark.AsimpleuserinterfaceisprovidedwhichallowstheoperatortoplacetheLarkintoseveralconfigurationssuitablefortesting.ThisdocumentisfiledasLarkRegistrationEPROM.tioga.The"InitialConfiguration"Whenpowerisfirstturnedon,orwheneverthetelephonesetishungup,theLarkisestablishedinaninitialconfiguration.Theoutsidelineishungup.ThetelephonesetissetupsothatDTMFsignallingisdirectedtotheDTMFdecoderandsothatvoicefromtheoutsidelineissenttothetelephonesetreceiver.Sidetoneisenabled.TheoutputoftheCODECD/Aconverterisdirectedtotheoutsideline,tothespeaker,andtoLineOutB.VoicefromtheoutsidelineisdirectedtoLineOutAaswellastothetelephonesetreceiver.CommandsPoweron--setsupinitialconfiguration.Poweroff--"revert"relaysdropoutandpermituseoftelephonesetasastandardtelephone.Hanguptelephone--alwaysreturnsLarktoinitalconfiguration.Lifttelephonehandset--noaction,buttheDTMFkeypadisnotactivatedunlessthephoneisoffhook.DTMF1--pickuptheoutsideline.DTMF2--hanguptheoutsideline.DTMF3--recordthefollowingdigitsequenceasastorednumberofupto18digits.Thenumberisterminatedeitherbya'#orbyhangingupthephone.Anumberstoredinthiswayisremembereduntilanothernumberisrecordedoruntilpoweristurnedoff.pî ìï_/qî1ï_/îpî(îï_/rî3Cï_/î:*îî9oî<'î@˜ î ìï:qîî@î�î›î î!tî$¤î&Rtî ìï7"î ÅîŒ rî ®ï3Óî¿îçîLîî‰îáî!žî'Ìî*%î0uî2‹î3ñî7sî9×î<0î?{î@à îGáî ìï2,î ÜîÈ î ®ï/±î†îOîîqîúî ®ï-6î‹îèî î|îžî¶î€î"Tî'" î-Pî.Áî4î5Éî8/î<ýîB:îD÷îFÁî ìï+�î îæîFîîÆî1îî Ãî##î)yî+–î1�î7Nî8ºî ®ï)î¤î5î î‹îCî!¾î'ñî){î.èî0µî33î8î;Iî=î?”îE îGàî ìï'lî 'îôî ®ï$ñîŽîõîUîîÕî@î$Žî&=î)xî,Eî-Òî/€î2nî4î5Êî8)î>€î@�tî ìï!¢rî ®ïTîæîìîcîîî î ®ïØîæîî�îçîÒî!$î#šî&Qî*Âî-7î.ðî5Fî7cî9î:;î?Ö î ®ï]înî€î×îNî²î#eî&¶î(eî+í î ®ïâîjîÆîâî^îjî"àî%fî'Ëî,™î1gî2Øî5Rî;î?HîA¬îEëîG]î ìï;î ®ïÀîvîªî!î&î8î˜î aî ®ïEîvîªî!î‰î›îûî Äî ®ï Êîoîœî îTî¬î ¸î#áî)Âî+iî,Œî0¨î5Íî7î9Šî;1î=îA’îDcî ìï "î W îHî4î0îYî–îZîUî$—î&©î)î.î/©î4Öî8ùî:¦î=Hî@îA‹ î ìï {î 3î>îjîÖî’î Vî#�î'Ëî)7î-¨ÿ•TVm$©Inter-OfficeMemorandum2DTMF4--dialtherecordednumberusingtheCODEC.Thetonesaregeneratedatalevelofabout-3.5dBmpertoneattheoutsideline.DTMF5--turnonechomode.Moreaboutthislater.DTMF6--ConnectthemicrophonetotheCODECinputfortransmissiontothephoneline.DTMF7--ConnectLineInAtotheCODECinputfortransmissiontothephoneline.DTMF8--ConnectLineInBtotheCODECinputfortransmissiontothephoneline.DTMF9--"Revert"thetelephonesetsothatitisdirectlyconnectedtotheoutsidelineasastandardtelephone.SinceinthisconfigurationthetelephonesetisnolongerconnectedtotheDTMFdecoder,theonlywaytoreturntotheinitalconfigurationistohangupthetelephone.DTMF*--SetupthespeakertolistentotheoutsidelineinsteadoftheoutputoftheCODEC.DTMF0--ConnectthetelephonesettotheCODECinputfortransmissiontothephoneline.DTMF#--Ifanumberisbeingrecorded,thiswillservetoendit.Ifanumberisnotbeingrecorded,#hasthesameeffectashangingupandreturnstheLarktotheinitalconfiguration.EchoModeThissectionexpandsupontheexplanationoftheactionoftheDTMF5command.Commands6,7,8,and0connectvariousdevicestotheCODECinput"fortransmissiontothephoneline."Thewaythisworksisthatthesourceisfiltered,digitized,passedthroughthelevellimitingsystem,convertedbacktoanalog,filteredagain,andtransmittedtotheoutsidelineifitisoffhook.Alternatively,EchoModecanbeused.Inechomode,thestepsareexactlythesameexceptthatthedigitalvoiceisnotpasseddirectlyfromA/DtoD/A,butratherbufferedinmemoryforawhile.Theeffectofthisslightdelay,40milliseconds,istogivethevoiceaslight"echo"character.LimitingsystemTherearetwopathstotheoutsideline.Onepath,activewhenthepowerisofforwhenthe"Revert"modehasbeenenteredviacommandDTMF9,connectsthetelphonesetdirectlytotipandringoftheoutsideline.Inallothercases,voicedirectedtotheoutsidelineisproducedbytheD/AconverterofCODEC1.Thisconverterdrivesalowpassfiltertoensurethatnoout-of-bandcomponentsreachthephonesystem.Inaddition,thereisalimitingsystemwhichoperatesonthedigitalvoiceandservestopreventlevelshigherthan-9.5dBmfromreachingthephonesystem.Wheneverthelevel,averagedoverabout1.2seconds,reachesabout-9.5dBm,2.5dBoflossisinserted,reducingtheleveltoabout-12dBm.ThislimitingsystemisactiveatalltimesexceptduringDTMFsignallingoftherecordednumber.TheseDTMFtonesaretransmittedatabout-3.5dBmperfrequency.headNode,repeatasneeded,nestforsubheadsifappropriatebodynode,repeatasneededuî£ïfå î(¢ vîHDïfårî ®ï_/î”îæî{îPîÍî§î$ñî(¹î+6î1çî4Ýî8šî; 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