User's Manual Part 1

Table Of Contents

Designing a Fusion Wideband Solution

Page 88 InterReach Fusion Wideband Installation, Operation, and Reference Manual

5 PathLossSlope: Foraroughestimate,Table68onpage84showsthatabuildingwith80%

hardwallofficesand20%cubicles,

at1920MHz,hasanapproximatepathlossslope(PLS)of

38.1.GiventheRFlinkbudgetof94.5dB,thedistanceofcoveragefromeachRAUwillbe30.2

meters(99ft).Thiscorrespondstoacoverageareaof2,868sq.meters(30,854sq.ft.)per

RAU(referto“Equation2—PathLossEquation”onpage83fordetailsonpathloss

estimation).Forthiscaseweassumedacircularradiationpattern,thoughthe

actualarea

covereddependsuponthepatternoftheantennaandtheobstructionsinthefacility.

6 EquipmentRequired:Sincey

ouknowthebuildingsize,youcannowestimatetheFusion

Widebandequipmentquantitiesneeded.BeforeyoutestanyRFlevelsinthebuilding,youcan

estimatethatfourantennasperlevelwillbeneeded.Thisassumesnopropagationbetween

floors.Ifthereispropagation,youmaynotneedantennasoneveryfloor.

• 4

antennasperfloor×16floors=64RAUs

• 64

RAUs÷8=8ExpansionHubs,asthereisamaximumof8RAUsperExpansionHub

• 8

ExpansionHubs÷4=2MainHubs,asthereisamaximumof4ExpansionHubsperMain

Hub

CheckthatthefiberandCATVcabledistancesareasrecommended.

Ifthedistancesdiffer,use

thetablesinSection6.4,“SystemGain,”onpage6‐16todeterminesystemgainsorlosses.The

pathlossmayneedtoberecalculatedtoassureadequatesignallevelsintherequired

coveragedistance.

Theaboveestimatesassumethatallcablel

engthrequirementsaremet.IfExpansionHubs

cannotbeplacedsothattheRAUsarewithinthedistancerequirement,additionalExpansion

HubsmayneedtobeplacedclosertotherequiredRAUslocations.

AnRFSiteSurveyandBuildingEvaluationisrequiredtoaccurate

lyestablishtheFusion

Widebandequipmentquantitiesrequiredforthebuilding.ThesitesurveymeasurestheRF

losseswithinthebuildingtodeterminetheactualPLS,usedinthefinalpathlossformulato

determinetheactualrequirementsoftheFusionWidebandsystem.