Transition E-100BTX-FX-06 - Active Link Pass-Through (ALPT)

TransitionNetworksE‐100BTX‐FX‐06UserGuide
33791Rev.A http://www.transition.com/ Page7of13
ActiveLinkPass‐Through(ALPT)
LinkPass‐Throughisatroubleshootingfeaturethatallowsthemediaconverte rtomonitorboththefiberand
copperRXports forlossofsignal.WiththelossofRXsignalononemediaport,theconverterwillautomatically
disabletheTXsignaloftheothermediaport,thus“passingthrough”
thelinkloss.
 Enddeviceautomaticallynotifiedoflinkloss
 Preventslossofvaluabledataunknowinglytransmittedoverinvalidlink
ActiveLPTisaformofLPTthatrequiresthelinkstobecomeActivebeforeLPTbecomesActive.
WithActiveLPTthereare2states:Diagnosticand Active.
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ThemediaconverterenterstheDiagnosticstatewheneitherofthefollowingconditions is met:
 Uponpower‐upoftheconverter.
 UponlosingLinkoneitherthecopperorfiberports.
IntheDiagnosticstate,thelinkforeachofthemediaconverter’sportscancomeupindependently
ofeachother,
justlikeaconverterthathasnoLPTfunctionality,oraconverterthathasLPTisdisabled.TheDiagnosticstateis 
helpfulduringfirstpowerup,before alllinksofacircuitareconnected,asitallowstheinstallertoseeeachlink
turnonasthecables
arepluggedin.It’salsohelpfulforfindingthelocationofafault,ifoneexists.
ThemediaconverterremainsintheDiagnosticstateuntilthefollowingconditionismet:
 Thelinkstatusforbothofthemediaconverter’sportsisup,simultaneously.
Afterthatconditionismet,ALPT
enterstheActivestate.ItremainsintheActivestateuntiltheconverteriseither
powereddown,oreitherthecopperportorthefiberportlosesLink.IntheActivestate,ActiveLPTworksas
shownbelow(thesameaswhenregularLPTisenabled).
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