TheAgilent86105Aincorporatestwomeasurementchannels--oneoptical,thesecondelectrical.Eachchannelhastwoselectablebandwidthsettings.Inthelowerbandwidthmodeof12.4GHz,oscilloscopenoiseperformanceisexcellent,whilethe20GHzmodeallowsgreaterfidelityforhigh-speedsignals.TheopticalchannelalsohasaswitchablefiltertoproduceacalibratedSDH/SONETreferencereceiver.Theintegratedopticalchannelreducesmi***atchlossvariationbyeliminatingsignaldistortingcablesandconnectorsassociatedwiththeuseofexternalreceiversinordertoaccuratelycharacterizeopticalw***eforms.Theopticalchanneliscalibratedat1310nmand1550nmtoprovideaccuratedisplayofthereceivedopticalw***eforminopticalpowerunitsandmeasurementofthesignal's***eragepower.Switchablefiltersforcompliancetestingat155,622,2488or9953Mb/sare***ailable.Theelectricalmeasurementchannelmaybeusedtoperformmeasurementsontributaryelectricalsignals,toevaluatereceiverperformanceintransceivertesting,formeasurementswithAgilent'swiderangeofexternalopticalreceivers,orforgeneralpurposemeasurements.)