ToFileDateOctober18,1983FromL.StewartLocationPARCSubjectCSL-8308RegistrationOrganizationCSLXEROXReleaseas/Indigo/Voice/Documentation/RegistrationExhibitE.tiogaCamefrom/Indigo/Voice/Documentation/RegistrationExhibitE.tiogaLasteditedbyL.Stewart,October18,19832:52pmAbstractThisdocumentcontainsExhibitEtobeincludedwithFCCForm730forthePart68registrationapplicationfortheCSL-8308VoiceTerminal.1.0GeneralThisexhibitcontainsadescriptionofallelectricalcircuitryandmechanicalconstructionaffectingcompliancewiththerequirementsofSubpartDofPart68oftheFCCrules.TheCSL-8308VoiceTerminalusessolidstateaudio,switching,andcontrolcircuits.Thepowersupplyandinterfacetothetelephonenetworkcontaindielectricbarrierstoprotecttheinternalcircuitsfromexternalstressessuchashazardousvoltagesandlightning.ProtectingtheinternalcircuitsoftheCSL-8308assurescompliancewithmostoftherequirementsofPart68.Theremainingrequirements,suchassignalpowerlimits,aremetbydesign.Thisexhibitbeginswithadiscussionofbasicsystemstructure.Thenthetelephonenetworkportinterfaceisdiscussedindetail,describinghowthevariouscomponentsaffectcompliancewiththerules.Thepowersupplyandmechanicalconstructionarecoverednext,leadingintoadiscussionofeachtestandhowtheCSL-8308designfulfillstherequirementsofthattest.2.0HardwareDescription2.1GeneralDiagramE-1isablockdiagramoftheCSL-8308VoiceTerminal.The8308isamicroprocessorbasedmultifunctionterminalintendedforapplicationsinofficesystemresearch.Externalconnectionsaremadetothe8308forpower,telephonenetwork,separatelyregisteredtelephoneset(astandard2500typesinglelineinstrument),non-registeredanalogvoicedevices,anddigitalinterfacesforcommunicationswithotherofficeequipment.EachexternalconnectionwillbeconsideredbelowforitsaffectsoncompliancewiththerequirementsofPart68.The8308isdesignedaroundananalogswitch.Theswitchhandlesallvoiceinterconnectionsbetweenthevarioussourcesandsinksexceptforsignalsboundtothetelephonenetworkinterface.SignalsboundforthetelephonenetworkarehandledspeciallyinordertomeetthesignalpowerlimitationsofPart68.Theanalogswitchiscontrolledbyapairofmicroprocessorswhichhavetheadditionalfunctionsofpî ìï_,qî1ï_,pî(îï_,rî3Cï_,î8‘î:Îpî ìï[Prî1ï[Pîôpî(îï[Prî3Cï[Ppî ìïWtrî1ïWtîœ pî(îïWt rî3CïWtsî{ïOãtî ìïFîoqî¬ïFð6tî ìïDXî Lqî¬ïDXð6tî ìïB±î �î¬ïB±qîKïB±î2ïB±îî\î©î!çî%-î(;tî ìï?bqî¬ï?bîúî›î!3î&Fî'åî)Èî+ìî1Çî5î8°î<¹î?ƒîAôîD‡îGªî ìï=º î î0înîÍî#8î'uî ìï:kî )rî ®ï7îäîžîîe î"”î$iî&v î,Zî1åî4º î;þ îCéî ìï5u î*îEî¤ îöî ¯î%èî'‹î)Dî,2î.î/Ðî20î5—î ®ï2úî¤î.î-î =î#Uî&Åî*î.a î4ìî7Âî<“îBjîEaî ìï1Rîjî/îâîžî î!oî&Ôî+À î1¶î6Îî8Šî=@î?­îDÐî ìï/«î iîÀî©îðî´î#Lî(£î+p î2I î8ìî;aî@ŒîEaîG/î ìï.îjî$ îtî¢î#î$Ýî'O î/³î1î4€î7fî:Qî@å î ìï,\î îËî·îåîî[î î"î ®ï)áîÜî�îðîî] î#ôî%Áî)Hî-× î4˜î8Kî:¿îA)îF•î ìï(:î“îÿî î¹îÝ î#wî&|î(Ýî-¦ î5Sî9 î@_îCzîEÛî ìï&’î ÒîîŽîS î‰ î'fî)Çî.÷î2mî7Nî:5î;l îAýîCÄîGî ìï$ëî £î¨îîrîÁî!î#p î+Áî-zî0Iuî ìï!œî )î~ î ìïMî )rî ®ïþîvî%î©îìîÅî!6î#î%€î,î/þî6ýî9îî=Mî>Ñî@ î ìïVî ß î‘îî!êî$9 î+áî-¡î1‰î6îgî@âîBûîG‰î ìï¹ î*îEî¤ îöî ¯î#�î ®ï>îfîŒîØîsîîâî$&î(üî+µî/Ïî4ºî6Šî9þîD î ìï–î 9îïî°îVîµîóî"î&{î*Äî,`î.­î4ñî:7 î@”îE4î ìï ïî #î{îËîîiî!°î'9î(àî,Žî.5î1—î3ïî7Ôî;û îB¸îDkîGRî ìï Hî ñîƒîêîƒ î3î \î!³î$¸î&žî0Êî5î8yî; îAªîGÖÿ4TVm$2CSL-8308ExhibitE2handlingdigitalvoiceandofdigitalcommunicationswithotherofficeequipment.2.2ExternalconnectionsTheexternalpowerconnectionistostandard120vACmains.ThepowersupplyisolationtransformerconstructionandinsulationprovidesisolationbetweentheACmainsandboththetelephonenetworkandnon-registeredequipmentandcircuits.Thetelephonenetworkconnectionincludesbothtelephoneconnections(tipandring)andauxiliaryconnections(AandA1).Thetelephonenetworkportcircuitsfullyisolatetheseconnectionsfromallothercircuitsthroughadielectricbarrier.Thetelephoneinstrumentisseparatelyregistered.The8308incorporatesapower-faillinetransferrelaywhichconnectsthetelephoneinstrumentdirectlytothetelephonenetwork.Connectionstonon-registeredanalogvoiceequipmentfallsintotwogroups:thoseforinputonlyandthoseforoutputonly.Thevoiceinputportsarethemicrophone(forspeakerphoneservice),andtwoline-levelaudioinputs(formusic-on-hold).Theoutputsarealoudspeakerandtwoline-levelaudiooutputs.Therearetwodigitalcommunicationsports,TTYandEthernet.TheTTYportisintendedforcommunicationswithlowbit-ratedevicessuchascomputerterminals,theEthernetportisahighbit-rateconnectiontotheExperimentalEthernetlocalareanetwork.2.3TelephonenetworkinterfaceDiagramE-2isablockdiagramofthetelephonenetworkinterface.DiagramsE-3-AandE-3-BaredetailedschematicdiagramsofthoseportionsoftheCSL-8306affectingcompliancewithPart68.TheCentralOffice(CO)lineisisolatedfromallothercircuitsbyfourdielectricbarriers,tworelays,atransformer,andanopto-isolator.ThustheCOlineisfloatingandhasnoconnectiontogroundexceptthatprovidedbyasecondaryprotectiondevice.2.3.1ProtectioncircuitsOnentrytothe8308,tipandringoftheCOlinepassthroughprotectioncircuitsconsistingofaTII-47BTgas-tubesurgesuppressorandthrough100microhenryand10ohmresistorsforRFIisolation.Thesurgesuppressorqualifiesasasecondaryprotectiondevice.2.3.2RingdetectorTheCOline,nowreferedtoastipAandringAinthedrawings,connectstothelightemittingsideofaTITIL119opto-isolator.CapacitorC40isratedat600voltsandservestoconnecttheopto-isolatoronlyforACringingcurrent.TheringerequivalencenumberoftheinternalringdetectcircuitisestablishedbytheresistanceofR58andbytheimpedanceofcapacitorC40.Thedielectricbarrieroftheopto-isolatorisratedat1500voltsandservestoprotecttheinternalcontrolcircuitsofthe8308.ComponentsR58andC40alsodeterminetheonhookimpedanceofthe8308.TheyareselectedtocomplywiththerequirementsofSection68.312(On-HookImpedanceLimitations).2.3.3LineRelayDiodesD9,D10,D11,andD12areratedat1000voltseach.Thebridgeformedbythesediodesservestoestablishproperoperatingpolarityfortheelectronicholdingcoildiscussedbelow.RelayK1isthe8308'slinerelay;whenclosed,itestablishesaconductingpathforCOloopcurrent.Thedielectricbarrierbetweencoilandcontactsisratedat1000vrmsandservestoprotecttheinternalcontrolcircuitsvî!Ïïfåî)ƒî/LwîHDïfårî ìï_/î¨îáîtî,îåî  î*Uî-pî1î4å uî ìï[àî )î rî ®ïX‘îÖîiîè î!5î"ñî$ðî*Üî-Âî/Hî2#î7¢î:Ëî?JîD î ìïVê îQ îî¹ î"î'€î,ôî2Tî4¤î7 î;î=»î@èîC8î ìïUBîDîû îî!îî$¥î ®ïRÇîƒî×î, î"&î'‡î*Áî1 î8“î;'î=ÜîA5îCêî ìïQ î‰î¬î�îMîBî#¶î)+î,Bî1î4vî8×î<} îDîGŸî ìïOyî ‹îJî‚î« î”î ®ïLýî�îë îãîW î$Ê î+ÿî.ßî2, î:î;2 îAÆîD„î ìïKVî Sîaîüî[î² î&£î+˜î-Gî/¦î5üî ®ïHÛ î«îs îšî$î'Æî.Æî1Îî4Àî7†î< î@YîB°îFuî ìïG4î ¸îkî½îCîaîNî!õî%´î)Gî+®î." î5×î8¢ îAkîFØî ìïEŒî “ î€îRî|î.î'’î*eî/Wî1¦î2Ë î:rî=%î?Ì îE¹î ìïCåî ®ïAjîÙîVî,î� î$ðî(ðî,uî/Vî6,î9.î<³î?ÖîAlîGRî ìï? îî!î³îxî#3î&Uî'õî. î4Xî6©î<@î?+î@ˆîA£îDºî ìï> îèî–îö îsî#î&_î)Xuî ìï:Ìî )î×îrî ®ï7}îSîÞî@î_îî bî"î$fî*²î/ÿ î6lî<–î@¢îCOîG;î ìï5Öî,î€îeî&î Îî&9î'ûî*cî0Öî6… î=Ëî@îîCåîF·î ìï4/îî{î?î2îÙî! î$Ãî&îî*Éî/Äî1ûî5; î;_î@þîCæîHeî ìï2‡ î´îgîT î+î"¥î%î'‘î*Dî+«î0²î3eî5Öî7Ø î>Ðî@zîE?î ìï0àî ºîŒîˆî±î î"«uî ìï-‘î 2 îôrî ®ï*Bî îÉîŒîî²îäî°î"§î$uî&éî)’î,^î/kî4¸ î;Zî@- îF˜îHeî ìï(›îîsî îÜî"Œî'¼î*I î1”î4Dî6!î9Iî>Žî@ÃîC´ î ìï&óî Äîn î=îÁîoî™î& î,“uî ìï#¤î 2î‚rî ®ï Uîˆî î1î7î÷î§î Xî#î&9î*&î+Öî.8î4dî:î;±î>îAFîF·î ìï®î Ÿî Âî¬îŽ îaî"›î%xî&Ýî*`î+óî.‚î1Âî4sî8yî:!î?2îA‹ î ìïî FîÄî�îŒî³î Ëî% î,Ùî2Fî4@î6àî<6î?YîC¨îH#î ìï_ îîî~ îÂî‹î ‰î#Pî%\î'Ëî.Ìî0”î6‚î:`î=H îC@îGÖî ìï¸î p î™î)î×î”îþî"iî%Eî)vî+Iî0î2›î7Õî<¬îA�îCmîEñî ìï îî$îùîúîäî$„î'î)%î,Àî3Îî5¥î8"î<î@%îB–îGàî ìïiîËîæîE î—îPî#/î'}î. î52 uî ìïî 2îarî ®ïÌîpî-îšîîÎî ãî#Fî&àî(‰î+ßî/5î3cî6Kî:«î?�îA›îE4î ìï$îîÅîoîùî 'î%Lî'˜î* î0Vî5pî8 î>8îC?îG:î ìï }î Jî œî°îYî,îÓî Kî!” î(Jî)f î0kî3„î5´î8;î;Rî@ÜîC¦ î ìï ÖîpîÜîzî/îpîÙî#`î$öî(:î+žî.Sî2]î4 î8°î; î@ îDÐÿ ÍTVm$JCSL-8308ExhibitE3ofthe8308.2.3.4Power-failtransferLinestipAandringAalsoconnecttothepower-failtransfercircuit.RelayK3servesasthepower-failtransferrelay.Intheeventofapowerfailure,theseparatelyregisteredtelephonesetconnectedtothe8308iscutthroughdirectlytotheCOtelephonelineviaK3.Thissetwilltypicallyhaveabridgedringer.RelayK3isofthesametypeasrelayK1andisratedfor1000vrmsbreakdown.Thetelephonesetdoesnotinvolvehazardousvoltagesourcesandfloatsontipandringassuringlongitudinalbalancerequirementsaremet.Inanyevent,thepower-failtransfermodeisnotanormaloperatingconditionandwouldbecorrectedquicklyasinthismodethecustomerwouldexperiencelossofallterminal-providedservicesexceptpower-failtransfer.2.3.5ElectronicholdingcoilAfterpassingthroughthelinerelayK1,theCOlineisreferredtoasSwLine+andSwLine-("SwitchedLine").ThesesignalsconnecttotheelectronicholdingcoilcircuitsurroundingtransistorQ2.ThiscircuitisacurrentsourcewithoperatingcurrentsetbythevalueofR98toapproximately38mA.ZenerdiodeD23divertssurgecurrentsbelowthethresholdofthegastubesupressordiscussedabove.2.3.6IsolationtransformerCapacitorC43isolatesthelinesideoftransformerT1fromtheoffhookvoltageacrosstheelectronicholdingcoil.Itservesnoroleinelectricalprotection.TransformerT1providesthemaindielectricbarrierbetweentheCOlineandtheinternalcircuitsofthe8308.Itsdielectricisratedat1250vrms.ThelongitudinalbalanceoftheCOlineisnotaffectedbytheterminationonthesecondarysidebecausethetransformerprovidesisolation.2.3.7TelephoneinterfacecircuitsThecircuitsonthesecondarysideoftransformerT1formasingletransformerhybrid.ZenerdiodesD13andD14provideafinallevelofprotectionfortheinternalcircuitsfromanysurgevoltageswhichpassthroughthetransformer.Thesignalpathfromthetelephonelinetravelstotheanalogswitchforfurtherdistribution.ThesignalpathtothetelephonelinecomesonlyfromthedigitaltoanalogconversionsectionoftheIntel2910/2912codec/filter.2.3.8SignalpowerlimitationsOut-of-bandsignalpowerislimitedbythelowpassanti-aliasingfiltersectionoftheIntel2912A.In-bandsignalpowerlimitsareenforcedbythemicroprocessorportionofthe8308.Boththesematterswillbedescribedinadditionaldetail.Signalpowerlimitsarenotadjustable.2.4Connectionstonon-registeredequipmentNospecialcircuitryisincludedintheinterfacecircuitrytonon-registeredequipmenteithertoprovidedielectricisolationfromtheinternalcircuitsofthe8306ortoprovidesignalpowerlimitations.Rather,thesefunctionsareprovidedbythetelephonenetworkportasdescribedabove.TheCSL-8308hastwoportsforconnectionofnon-registeredvoiceoraudiodevices,LineInAandLineInB.Theseportsareintendedformusic-on-holdapplication.Inaddition,thereisaportintendedfortheconnectionofamicrophoneforspeakerphoneservice(livevoice).vî!Ïïfåî)ƒî/LwîHDïfårî ìï_/î ¥îuî ìï[ßî 2 î¾rî ®ïX�îLîQîçî²î^î!Tî"áî% î+Œî0vî5Kî9î;Jî?6î@ÄîC î ìïVèîîTî,î”îRîîFî"|î'7î)  î0 î6hî<Çî>ìîExîG/î ìïUAî RîÞîSî«îÀî�î î"Äî);î,î.oî1àî5î7Xî:#î?ÈîC.îDxî ìïSšîÔîÀîî�î:î™îî!&î"Ôî&;î(‘î+Hî,´î0=î2zî5Àî9' î ®ïQî îîHî’î!î#î)«î.‚î3pî6Bî:î<1î>iîA:îD7î ìïOw î¢î¬ îî!fî%î&òî)�î-´î0 î6´î;Éî?©îAîCžîDÒî ìïMÏî î&îÛîîöî$óî)Ðî+|î-(î/Çî3›î5ùî;ßî@ îFäî ìïL(î ¥î •îÕîßî"/ î(¼uî ìïHÙî 2 îÈî¥rî ®ïE‰îˆî˜î î©î œî$?î')î)Åî,—î/Šî12î6°î8›î:…îA"îDî ìïCâ îðîîîhî#pî%î'a î-’î2�î5!î9M îA îFïî ìïB:î îFî´îáî­îÿî î&>î+ î-*î/)î1‹î57î6óî9äî;• îD™îF�î ìï@“î îîÄîÈîCîíî";î&Hî(§î.¼î0uî2Ôî53î8Yî>bîDkuî ìï=Cî 2îë rî ®ï9ôîÜî¬îbî°îTî"î#Á î+#î-.î0‚î2Ðî4ðî8[î=îAîCO î ìï8Lîîíî�îÂîñîæî½ î%¬ î-g î5|î7Áî=yî@îC¦ î ìï6¥î…îîyî!îëîµî!(î&Pî+"î,îî/`î3¨î5¶ î;±î=0î@ÌîBxîEÐî ìï4þî ¶ îTîFîñîBîÊî"rî#Ðî&7î+aî-Oî/  î6üî8ôî;EîA£îDmî ìï3Vî K îÀîO uî ìï0î 2îßîŽrî ®ï,·îrîîîZî±î!vî# î*{î,ƒî/Õî0ëî4 î<"îAGîE4î ìï+î øî·îÂîÕîî=î‹î!K î'áî*%î,Œî1ªî6pî9Þî<‡î@8îE�î ìï)iî ñî4îŸ îîéî#àî'î*„î,ïî3Pî6î:xî<1î>œîC îGRî ìï'ÁîÚ î«îÈîùî"dî$Xî&ýî-™î0•î5î8gî<î>¸îC6îE*î ìï& îÑîmî&î†îÌî#„ uî ìï"Êî 2îuîv rî ®ï{ î¯î®îïîmî#3î%Bî'´î*hî-t î52î8¢î=Qî?îA�îDéî ìïÓî+îî=îîSî#î$øî'T î0Ëî5¦î7[î9·î=ÑîA*îD°î ìï,î —îˆî³îa îØî!î%­î)Ûî-¥î/ùî2n uî ìïÜî ) îÿî¸ î¢rî ®ï�îNîî´î^î!Bî#.î%Ëî+®î1[î3H î<’îC¶îGàî ìïæîÿ îðî}îìî Tî%sî*:î+ûî.dî1²î3î56î:Iî>=îBt î ìï>îÖî`î^î±î ƒî"î$Þî+5î0Œî3†î54î;_î ®ïÃî|îÝîIîëî_î “ î'…î)4 î27î5Àî7{î;Gî@^îC�îEUîFØî ìïî îÏîðîÞîIî‰î 2î"\ î+a î3™î5Tî;î>~î?Öî@ìîCÓî ìï tî )î‰ î…î>îg î î"F î*úî/�î2šÿ bTVm$:CSL-8308ExhibitE4Othernon-registeredexternalequipmentincludesaloudspeaker,line-leveloutputs,anddigitalcommunicationsinterfaces.ThesedevicesdonotaffectcompliancewithPart68.2.5ConnectionstoseparatelyregisteredequipmentAstandard2500typedesktelephonesetisnormallyconnectedtotheCSL-8308.Inthepower-failtransfermode,thissetiscutthroughdirectlytotheCOline.Innormaloperation,however,thetelephonesetisconnectedtotheanalogswitch.Inthismode,thevoiceandsignalingpathfromthetelephonesettotheCOlinepassesthroughthesamefilteringandlevellimitingfunctionsasallothersignalsourcesexceptnetworkaddresssignaling.ThetelephoneincludedwiththeCSL-8308isregisteredunderFCCRegistrationNumberAS293P-70088-TE-Tandhasaringerequivalencenumberof1.0A.2.6DigitalcommunicationsThemicroprocessorinthe8308includesinterfacesfordigitalcommunicationswithotherofficeequipmentbyEIARS-232andbytheXeroxExperimentalEthernetlocalareanetwork.TheRS-232interfaceisintendedforcommunicationswithlowbit-ratedevicessuchascomputerterminals.TheEthernetinterfaceisintendedforcommunicationswithofficeworkstationcomputers.2.7PowerSupplyTheCSL-8308VoiceTerminalincorporatesaCondorTD-60Wlinearregulatedpowersupply.Forfurtherelectricalisolation,anisolationtransformerisincludedwhichincorporatestransformerdielectricinexcessof1500vrms.Allsecondaryoutputsofthepowersupplyarenon-hazardousandoperateatplus5voltsfordigitallogic,andplusandminus12voltsforoperationalamplifiers.The8308doesnotincorporatearinginggeneratortodrivethetelephonesetringer.Allprimarycircuitsarewellseparatedfromthesecondarycircuitwiring.DiagramE-4showscircuitsontheprimarysideofthepowersupply.DiagramsE-5-AandE-5-Barethemanufacturer'spartslistandschematics.2.8MechanicalconstructionTheCSL-8308packageconsistsofametalcaseenclosingcircuitboardsandpower-supply.Theexternaldimensionsare12.5incheshigh,5incheswide,and13.5inchesdeep.Thecaseconsistsoftopandbottomsolidcovers,perforatedsides,front"connector"panel,andrear"powersupply"panel.Theentirecaseandsecondarycircuitgroundiselectricallyconnectedtothepowercord"green"earthgroundterminalandconsideredtobeanexposedconductingsurface.Thetopandbottomcoversincludepermanentlymountedpemnuts.Thesides,front,andrearpanelsattachtothetopandbottomcoverswith28screws.Thepowersupplypanelsupportsthepowersupply,circuitbreaker,andIECpowercordconnector.Secondaryleadsfromthepowersupplyarecabledtogetherandconnecttothe"digital"boardviaalatchingconnector.Theconnectorpanelsupportsthe"digital"and"analog"circuitboards.ThedigitalboardisattachedtothepanelbythemountingscrewsfortheEthernetandTTYconnectors.Theanalogboardisattachedtothepanelbytwoanglebrackets.Theanglebracketsattachtostudspermanentlyweldedtothepanel.Thedigitalandanalogboardsformasandwich.Thefrontedgeofeachboardisattachedtotheconnectorpanelasdescribedabove.Theboardsareinterconnectedattheirrearedgesbyalatchinginterboardconnector.Duringshipping,cardguidesareinstalledonthetopandbottomcoversforaddtionalboardsupport.vî!Ïïfåî)ƒî/LwîHDïfårî ®ï_/îð îIîÖî'î,·î., î6| î<¹îBSîEVî ìï]ˆ î# î)î+î#ôî%úî(oî,; î3yî6“î9‚uî ìïZ8î ) îÿî¸ î. î"wrî ®ïVèî9îÓîî'îWî#¬î%Èî'3î-î3„î52î7�î>Öî@¤îC î ìïUAîÙîéîmîlîºîñî î$ãî&tî(µî+-î.„î05î4Ô î;8î@÷îC8î ìïSšî î jîéî’îìîLî!Xî#"î%¾î)çî,Bî/Ðî2‚î8Cî;dî>ÆîA!îGrî ìïQòî ¦îî²îtî¢îæîQî"Ùî(î*Þî./î3[î9eî;î=î@ÄîD»î ìïPKîGî©îž îTî"7î(˜î.Iî1oî3Ùî:Oî;Å îBîF(î ìïN¤ î£î+î#öî&­î)"î*Lî.X î5Øî;î<¾uî ìïKTî )îÅ rî ®ïHîº îhîJîÞî!Xî&ð î-Mî/¿î4, î>—îAæîE¹î ìïF]îêîþîîîÔîèî"_î&š î//î4íî8Lî;\îAÀîD°î ìïD¶î¼îRî8îŸ î$î'Eî*î/î4î7]î95î?Š îF·î ìïCî’î8î£î`î� î(Ôî+ïî/Å î7. uî ìï?¿î )îarî ®ï7î@†îCoî ìï4+î Sî²îîYî ®ï1¯îbîüî îÐîÛî"?î'zî*Vî,î/î33î8‰î>ÁîBÝîE™î ìï0î ?îŸ îúîbî î W uî ìï,¸î ® î rî ®ï)iîªî:î¡î Æî"¤î#òî'âî*õî1"î5�î:!î<ý îF·î ìï'Áî/ îbî¶î¥îßî#^î$”î(Ïî,zî/2î2 î6[î:–î=oî@^îE_îGî ìï&î œî_î©î3 îÛî#ˆî&ô î.¤î2¶î5fî87î=îB)îF·î ìï$sî Çî£îIî¤îÍî"„î#Þ î*§î1î2¶î5î9 î<4îANîDÆî ìï"Ëîeî îî°î¡î‘î#Þ î*ñî ®ï Pî­îJî(îîyî#€ î+ î1šî4Üî9 î< î?æîCØîF·î ìï¨î0î?îíîMîÂîyî Cî${î'–î){î ®ï,î}î£î îÃî!Kî#¢î'Èî,ˆî0ºî6 î8¹î;žî?ÄîBá î ìï…î½î^îçîiîºî#Nî%Äî*Bî/Èî2¢î7Ûî9¬îçîBÃîDî ìï»î ‰î ×î…îoî½îëî )î"Uî$£î*7î,Ýî0' î7ºî:�î>ÔîBºîDî ìïî �î äî™îŠî+îÊîóî"Áî&_î+¸î/¼î1_î4Þ î<ÌîAîC#îEwî ìïlî §îÃî]î¤îîLî Xî&÷î)²î-î00î1Ìî4àî8¹î:î?eî@öîC8î ìïÅî Æî�îÔîçîÙî"oî$Ý î.=î/ðî3Qî6Dî:)îî ®î¬îúî\îÌ rî ®ï:Èî†îÜî4î Úî%˜î)» î0ùî4î6µî;Rî= î?jî ®ï8MîîIîxî÷î)î!_î&ƒî*wî,Ôî16î4zî6Ÿî9^î5î@€îE‚î ìï$tî ³î î„î®îòî_î#å î+Íî.³î5î7Aî8º î?4 îEŒî ìï"Íî R îîŽî(2î*î.» î5<î:³îA¢îC î ìï!%î èîGî îõî®îœî!Sî ®ïªî+î™îðîøî“î!.î'î)‡î,,î.b î3ôî82î<Æî?¡îC î ìïî©îœî îºuî ìï´î ®î¬îúî\ îiî$ª rî ®ïeîŽî]î˜ î!Uî&gî'å î.xî0†î2÷î5žî8fî=ŸîAfîC×îH#î ìï¾îî?î]î= î Pî"mî$ãî*Rî-Aî/î1ˆî6} î=Òî?UîEIîG/î ìï îuîŸ îGî!Cî"« î))î+!î-|î2yî4.î6‰ î<ò îC8î ìïouî ìï î ®î¬îúî\îŸî× rî ®ï Ñî¿îRî­înîkî!Âî(:î-Sî0 î7Žî;qî?–îEŠîG/ÿFTVm$YCSL-8308ExhibitE6networkfromanyequipmentconnectedtothenetwork.TheCSL-8308limitssignalpowerbydigitalmeans.AllsignalsreachingtheCOlineinterfacecircuitsarefirstdigitallyencoded.Networksignalingsignalsaregeneratedbythe8308indigitalform.Music-on-holdandlivevoicesignalsboundforthetelephonenetworkareconvertedtodigitalformanddigitallyprocessedbeforebeingconvertedbacktoanalogandpassedtotheCOlineinterfacecircuits.Signalsfornetworksignalingareinternallygeneratedbythe8308sothatthepowerdeliveredtotheloopsimulatorcircuitwillbelessthan0dBmaveragedover3seconds.Signalsfromthemusic-on-holdandlivevoiceportsareconvertedtodigitalforminsidethe8308.Theythenpassthroughadigitalpowerlimitingcircuitbeforebeforebeingconvertedbacktoanalogform.Out-of-bandsignalsareattenuatedbytheIntel2912Alow-passfilterintwoways,onA/DconversionandagainonD/Aconversion.ThecharacteristicsofthisfiltermeettheATTD3/D4channelbankspecifications.Thecombinedfiltercharacteristicresultsin28dBattenuationat4000Hzand64dBattenuationabove4600Hz.68.308(b)(1)(i)Non-signalingin-bandpower.Thedigitallimitingcircuitlimitstheaveragepowerofnon-live-voicesignalstolessthan-10.5dBm.LimitingissettothislimitsothatnomanufacturingvariationsamongtheanalogcomponentsintheCOlineinterfacecircuitscouldcausetheleveltoexceed-9dBmatthetelephonenetworkport.Thedigitallimitingcircuitoperatesbyinserting2.5dBoflosswheneverthelevelatthetelephonenetworkapproaches-10.5dBm.Thelossisincreasedin2.5dBstepsupto20dB.Sincethedigitalcircuitryclipsatalevelof+5.7dBm,the20dBrangeofattenuationissufficenttolimitanysignalwhichcanberepresentedindigitalform.Thesesettingsarenotadjustable.68.308(b)(2)(i)Signalingpower.Signalsfornetworksignalingareinternallygeneratedbythe8308sothatthepowerdeliveredtotheloopsimulatorcircuitwillbelessthan0dBmaveragedover3seconds.Sincethesignalsaregeneratedindigitalform,therearenotolerances.Thelevelisnotadjustable.68.308(b)(3)Through-transmissionrequirements.Innormaloperation,theCSL-8308doesnotincludeathrough-transmissioncapability.Inpower-failtransfermode,theCSL-8308doesnotprovideloopcurrent.68.308(b)(4)(iv)DataTerminalEquipment.TheCSL-8308isnotDataTerminalEquipment,butneverthelesscomplieswiththerestrictionsofthissectionbyprovidinganon-adjustablelevelofnogreaterthan-9dBm.68.308(b)(5)Through-transmissiongainrequirements.TheCSL-8308providesforthroughtransmissiononlyinpower-failtransfermode.Inthismode,theCSL-8308providesneithergainnorloss.68.308(c)(1)Powerinthe3995-4005Hzband.TheCSL-8308doesnotincorporateinternalsignalsourcesotherthanfornetworksignaling.68.308(c)(2)Powerinthe3995-4005Hzband,throughtransmission.TheCSL-8308providesforthroughtransmissiononlyinpower-failtransfermode.Inthismode,theCSL-8308providesneithergainnorloss.68.308(d)Longitudinalvoltage.Thenetworkinterfaceportcircuitryistransformercoupledandnotconnectedtoground.Bydesign,the8308cannotproduceanylongitudinalvoltages.3.6Section68.306--HazardousVoltageLimitationsTheCOlinecircuitassurescompliancewiththissection.Thisisapparentbecausethecircuitonthenetworksideofthedielectricbarrierisfloatingwithrespecttogroundandbecausethedelectricbarriercomplieswiththeleakagecurrentrequirementsofsection68.304.Internalamplifiersinthe8308vî!Ïïfåî)ƒî/LwîHDïfårî ìï_/îDî«îKî2î"µî$cî&Ãî ®ï\´îµîOîIîcî"Àî$ëî)Sî.Ñî1Sî5òî;°î>?îAîCéî ìï[ î¯îîäî5î”î%Lî+î/Šî1âî82î:2î<–î?àîA“îEÐî ìïYe î+îÝîxîî pî$Åî&ýî)Wî/¨î4úî7Hî=™î?BîCvîFØî ìïW¾î9îyîÈî“î#éî'0î(ßî-Cî/ûî4`î6î8nî;î=ºîC`î ®ïUBîTî…îÑîŠî Ò î&ïî-.î/î1rî4¬î6dî9&î;yî?›îE�îG/î ìïS›î î$î_î îûî�î!¶î"ëî&Gî,î/'î0\î ®ïQîpîçîV î î#Fî%öî)šî-(î/‹î5òî7°î;ùî?pîC‚îEñî ìïOxî ’îÖîíîCîŠîáî#-î(kî,Ãî10î5�î9…î?ùîC^îE*î ìïMÑî¤ îÍîwî î$ûî'1î)Ëî-Lî1Ôî7�î;4î=î@îCòîF3î ìïL) î¾îbîùîìî5 î#Ðî&–î/Dî0êî3yî6Âî:îî:hî>"î@rîEaî ìïD¸î 6 î'î�îRîíî!î$‡î(Ëî.vî/èî2 î3Àî6hî9µî;î>Sî@` î ìïC î î›îðîJ î"ìî$�î&äî)nî,î1µî6iî:*î=Ôî@)îCdîEî ìïAiî ¥î î±îî~îáî"Îî%±î)öî/"î3hî8áî:èî@™îBáîEîFãî ìï?Âîî`î–îînî´î$ü î,î/jî3‚î6Jî8åî:Aî@:îAØîDîF'î ìï>î î ½îªîÈî…îíî.î"¥î%Ýî'~î(°î+ýî.Kî08î2|î69î8 î:�î<Èî@šîB[ î ìïî@VîB´ î ®ï9øîî€îËîÈîôî#Dî(î*zî/öî5Þî8U î>¢îEîG/î ìï8Pî <î îãîLî…îŒî Eî"¯î%Þî+ûî0@î2õî4ðî7�î:Àî;ÿî?fîE6îHZî ìï6©îHî3îÈîlîõî$uî&Yî*Çî.¼î2zî5î7> î>ðîAþîEyîGî ìï5 î ®ï2†îîsîXî#ý î-dî/Pî4* î:Èî=EîCÍîGî ìï0ßîÓîî î$Eî& î,¯î1Âî5÷î8^î>ÐîBîD„î ìï/8î î ®ï,¼îñî$îAî;îŽî!u î)dî,2î2’î3ôî6^î9±î?˜ îGî ìï+ î‰î*î+îp î#Qî$ðî'xî+úî-Üî4î5 î><îAgîCîDòî ìï)nî îÀî ®ï&òîIîÕîî$óî(E î2î55î;îîAÌîDWî ìï%K îçîîá î†î"ªî'�î)vî,0î0wî2ïî9tî?îCçîGî ìï#£î ®ï!(îðî÷î�îºî]î²î$'î&[î*Ÿî-lî3Ìî6ñî9[ î@™îE¤î ìï�îÀî_î…îÂî î ®ïîûî î¶îîî›îúî$zî&¸î*�î/Å î8�î;YîAÃîGRî ìï^îE îHîƒîR î"ÿî(+î-î/î1Ðî6î8 î?,îDÜî ìï·î ðîzî ®ï;î îó î5î!òî$Üî*Fî/ýî3 î8Šî: îAŽîFØî ìï”î aîäî“î7îSî ûî#Zî& î+î0uî3 î:Âuî ìïDî ®î¬îúî\î@î#V rî ®ïõîœîHîîeî# î%wî(¨î+`î1î46î5¸î;Šî@ÂîC8îG‰î ìï Nî mîçîáî¼î= îGî#ïî%}î*©î-æî2°î4�î9kîìîYîaîºîGîþî ;î#¸î& î*î, î2î3Qî6 î7=î8öî;Vî@Ù î ®ïÀîEîHeî ìï:Êîª î]îôîÏî!¹î$ î)fî-¹î2Ô î;î@‡îC8î ìï9" îlî#îÈîFîôî"}î'Fî*ûî0=î1ëî6´î;;î=Ðuî ìï5Óî )îî®rî ®ï2„îÇî¨îÿîbî#xî)5î+ìî1. î ®ï0îÇî¨îÿî¸îî#nî(Æ î ®ï-�îîkîúî!Öî#�î%îî,Eî1œ î ®ï+îÇîVî®îgî!”î&î+<î ®ï(–îî—îÐîA î&©î)`î,Èî ®ï&îÇîî\îauî ìï"Ëî )îÒî ìï|î ®îæîî( rî ®ï,îKîÄîTî(¸î,Aî-Úî/î ®ï±îR î@îÿî"Àî&Iî'âî+(î/4î2ôî4¢î:î ®ï6îæîÐîÛî"î$—î)î-4î/ëuî ìïæî ®î[îœîJ rî ®ï—î\ î¾îî%vî(ÿî*—î--î ®ïî"î>î7 îºîO î ®ï  îôîâîÛ î î†î!’î$(ìTVm$'CSL-8308ExhibitE8C40ringdetectcapacitor:0.1microfarad,600voltsR58,ringdetectresistor:22Kohms,1/4wattD26,ringdetectcatchdiode:1N4148,60voltsU21,ringdetectopto-isolator:TexasInstrumentsTIL119,rated1500voltsD9-D12,bridgerectifier:1N4007diodes,rated1000voltsand1ampereK1,K3,relays:Midtex190-22E100,rated1000vrms,refertoattachedE-7D23,holdingcoilprotectivediode,1N5363,5wattzener,rated35voltsR96,holdingcoilresistor:4.7Kohms,1/4wattR97,holdingcoilresistor:68ohms,1/4wattR98,holdingcoilresistor:18ohms,1/4wattQ2,holdingcoiltransistor:2N3904,rated60voltsC43,off-hookDCblockingcapacitor:22microfarads,rated35voltsT1,hybridandisolationtransformer:Midcom671-0339,rated1250vrms,refertoattachedE-8D13,D14,protectivediodes:1N4273Arated3.0volts,500milliwattsU2,low-passfilter:Intel2912A,refertoattachedE-96.0Additionalinformation6.1RedialingTheCSL-8308doesnotincorporateanautomaticre-dialingfacility.vî!Ïïfåî)ƒî/LwîHDïfårî ®ï_/î�îsî‚ îØî î&hî(þî ®ï\´îôîÖîåî'î,î#9î%Îî ®ïZ9î îíîûî�îàî$Qî&6î ®ïW¾î îìîû îxî#c î*úî0;î3Äî7 î ®ïUCîîÿî[î« îEî"^î'î*šî-àî1&î3Ýî5î ®ïRÈî[îîmî6 î"öî&€î)Åî-…î0Öî2„î7ÿî ®ïPMî îî¶ îî"Fî'·î(ëî+ðî/ýî3†î5kî ®ïMÒîôîÿîŸîáîî Âî$Ïî'eî ®ïKWîôîÿîŸîáîÆî"Óî%hî ®ïHÜîôîÿîŸîáîÆî"Óî%hî ®ïFaîNîYîú îpî"âî&kî(Pî ®ïCæîèî�î.îÈ î$î& î-Üî1eî3Jî ®ïAkî"î“îJîÎ î#»î)?î/hî2ñî67î9öî=Gî>öîDqî ®ï>ðî îf îÈîœî$½î(Fî*ƒî.!î0· î ®ï