Radwin 2000 D+ User Manual

RADWIN2000D+UserManual Release3.6.00 B‐1
AppendixB:SettingAntenna
Parameters
B.1AntennaIssues
ThechoiceofTxPower,antennagainandcableloss(betweentheradioandtheantenna)
determinestheEIRPandisaffecte dbysuchconsiderationsasradiolimitationsandregulatory
restrictions.
Beforeproceedingtoantennainstallationdetails,thefollowingbackgroundinformation
shouldbeconsidered:
B.2AboutSingleandDualAntennas
EachRADWIN2000D+ODUismadeoftworadiotransceivers(radios).Theradiosmakeuse
ofalgorithmsthat utilizebothSpatialMultiplexingandDiversityresultinginenhanced
capacity,rangeandlinkavailability.Thenumberofantennas(i.e.radios)usedisdetermined
byuserconfigurationandbyautomaticsystemdecisions,explained
below.
B.2.1DualAntennasattheHBSandanHSU
Whenusingdualantennasatbothsites(singlebipolarantennaortwounipolarantennas)you
canchoosebetweenSpatialMultiplexingModeandDiversityMode.
SpatialMultiplexingMode
Underthismode,thesystemdoublesthelinkcapacity.Atthesametime,itkeepsthesame
rateandmodulationperradioaswasusedwithsingleantenna,thusincreasingcapacity,
rangeandavailability.
Forexample,at80MHzCBW,usingadualantennaRADWIN2000D+cantransmitat
modulationof256QAMandFECof5/6 andgetanairrateof866.7Mbps,comparedto433.3
Mbpswithsingleantenna.
Toworkinthismode,eachantennaportmustbeconnectedtoanantenna,theRSSlevelin
bothreceiversshouldbebalancedandaminimalseparationbetweentheantennasmustbe

Radwin 2000 D+ Specifications

General

Brand	Radwin
Model	2000 D+
Category	Wireless Access Point
Language	English