User's Manual
Table Of Contents
- Chapter 0 - Front Cover
- Chapter 0 - Table of Contents
- Chapter 1 - Introduction
- Chapter 2 - Starting Out
- Chapter 3 - Example Applications
- Chapter 4 - Utilities and Features
- Chapter 5 - Web Configuration Manager
- Chapter 6 - Serial Configuration and Applications
- Chapter 7 - Bridging and Mesh Networking
- Chapter 8 - Antenna Setup
- Apx A - Licensing Information
- Apx B - Interface Ports
- Apx C - Radio Configuration
- Apx D - Security
- Apx E - Troubleshooting
- Apx F - Horizon 2.4 Specifications
- Apx G - Horizon 900 Specifications
- Apx H - Horizon 4.9 Specifications
- Apx I - Horizon 5.8 Specifications
APPENDIXC
RADIOCONFIGURATION
Revised: 27 Jan 2017 APX C-4 ESTeem Horizon Series
DataRatesandThroughput
TheHorizonseriesradiosaredesignedtodynamicallychangetheir dataratebasedupontheircurrentreceivesignalstrength
andbackgroundnoisetoachievethehig hestthroughput.Itishighl y recommendedtoallowtheHorizontodynamicallyscaleto
thebestdata rategiventheope ra tio nconditions.Thefollowingtablesshowthedatarat
estheHorizonradioswi ll useandthe
receivesignalstrengthrequiredforeachlevel.
Glossary
LegacyIndex–Thisindexshowsthe dataratestheHorizonradioswillusewhenoperatingatlegacy802.11(802.11g,802.11bor
802.11a)ratesandto communicatewiththeolderESTe emModel195Eseriesradiomodems.
HTMCSIndex–HighThroughput(HT)ModulationandCodingScheme(MCS)indexvaluelistgiveseverycombinationof
"numberofspatialstreams+modulationtype+codingrate"thatis possible.InpracticetheachievableMCSvaluewilldepend
onalargenumberofvariablessuchasreceivesignalstrength,availablebandwidth,RFbackgroundnoiseandotherusersona
givenchannel.TheMCSvaluewillonlytellthe 'overtheai
r'datarateofalinkandnotdefinewhattheactualusablethroughput
(seebelow).
DSSS–DirectSequenceSpreadSpectrum.Thisisalegacymodulationtypeusedin802.11bwirelessnetworks.
OFDM–OrthogonalFrequency‐DivisionMultiplexingisthelatestmodulationschemeusedasadigitalmulti‐carrier modulation
method.Alargenumberofcloselyspacedorthogonalsub‐carrier signalsareusedtocarrydataonseveralparalleldatastreams
orchannelstoachievethehigherthroughputsofthe802.11nprotocols.
Modul.(Modulation)‐Themodulationishowthedataistransportedonthecarrierfrequency.Therearemultipletypesof
modulationusedintheHorizonhardwareandtheyareli stedonthefollowingchartsstrictlyforreference.
CodingRate‐Thisisanindicationofhowmuchofthe datastreamisactuallybeingusedtotransmitus a b le data.Thisis
expressedasafractionwiththemostefficientratebeing5/6 or83.3%ofthe datastreambeingused.
GuardInterval–TheGuardInterval(GI )iseffectivelyaveryshortpausebetweenpackettrans missi ontoallowforanyfalse
informationtobeignored.ThelongerGuardIntervalcanimprovereliabilityinmoresaturatedwirelessnetwork s . Theinterval
shownisinnanoseconds(ns)oronebillionthofasecond(x10‐9).
Bandwidth‐Alsoknownaschannelwidth,thisishowmuchofthefrequencyspectrumisbeingusedtotransportdata.The
maximumbandwidthusedbytheHorizonseriesis40MHz.Thetableshowsvaluesforavailablebandwidthbymodelwhich
directlycorrelatetotheradiothroughput.Forexample,a10MHzchannelwillprovidehalftheDataRateofa20MHz.
Signal–Thisistheamountofreceivesignalstrengthrequiredtoachie
veagivendatarate.Manyfactorssuchasradio
backgroundnoiseandotherusersinafrequencychannelwillgreatlyaffecttheamountofsignalstrengthrequired.Thevalues
providedaretobeusedasareferenceforlineofsight(LOS)path‐losscalculations.
RFRate–Thisistherateatwhichoneradiotransmitsdatafromonetoan
other.
Throughput–Thedisplayedthroughputisanapproximationoftheeffectivedatarateofaradiosystemcomparedtosending
Ethernetdataoverstandardwire.ThisnumbertakesintoaccountfactorslikeRFpacketoverhead,retries,andlatencyofthe
radio.
dBm–Decibelsinreferencetoamilliwatt(mW).Thisisastandardunitofreceivesignalstrength.
Mbps–Mega(million)bitspersecond.Thestandardunitofdatarateusedinhighspeedwirelessdevices.