Radwin Transportation FiberinMotion - Page 79

FinMDeploymentGuide Release4.5.10 3‐13
IntraTrainHandover(ITHO)UpdateMessage NetworkGuidelines
ThisprocesshappensinparallelandindependentlyfromtheIBHO.Thebackgroundprocess
consistsofacontinuousevaluationbetweenthe2on‐boardTMUs,astowhichcanreceive
thehigherthroughput(regardlessofwhichbasetheyareconnectedto).
WhenanITHOoccurs,anupdatemustalsobesenttotheon‐boardrouter.Thisupdatewill
refreshtheswitchesalongthenewdatapathastothe newactiveTMU.
ConsiderFigure 3‐9whereitisshownthatTMU‐AisconnectedtoTBS‐1andisACTIVE
(passingtraffic).Alltrafficflowsinthegreenpath.
TMU‐BisPASSIVE.IthasanidleconnectiontoaTBSanditmonitorsthepotentialthroughput,
butdoesnotpasstraffic.
Figure3‐9:ITHO‐Part1