Installation Guide

FinMInstallationGuide Release4.5.25 2‐1
Chapter2:SiteInstallation
2.1ScopeofThisChapter
ThischapterdescribeshowtoinstalltheequipmentfortheTransportationFiberinMotion
solution.Itisdividedintotwomainsections:
• Waysideinstallation
• On‐boardinstallation
2.2Wayside
TheFiberinMotionsolutionusesmultipleantennastoenableMIMOandDiversitymodes.
Thesolutionreliesonantennaspacing,aswellasdualpolarization/dualslantedantennasto
differentiatetheradiostreams.
2.2.1Overview
GeneralMountingArrangement
TheTBSunitmustbeinstalledinaRestrictedAccessLocation.
TheTBScanbemountedonapoleorawall,togetherwithitsantennasandLPUs.Toenable
bett erMIMOconditions,theantennasshouldbedividedbetweenverticalandhorizontal
polarizations.Figure 2‐1showsanexampleofaTBSmountedonapole
• Placethetower/TBSatthelocationdeterminedbythesitesurvey.
• Makesurethereissufficientline‐of‐sighttowardsthetracksegmenttheantennas
willcover
• Makesurethatther earenoobstaclesdirectlyinfrontoftheantennas
• Thelowestantennamustbehigherthanthehighestrailcarontheline
• ThereareseveralwaysyoucanorienttheTBSantennas,dependingontheorien‐
tationoftheTMUantennas.Thes eoptionsaredetailedinseeTMU‐TBSantenna
alternativeorientationoptionsonpage 2‐47.