Snom M700 User manual

snom M700

Multicell Deployment Guide

v1.0

Version1.0  Page|2

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snom M700 multicell deployment guide

(Capacity Planning/Deployment/Installation)

Contents



Contents.............................................................................................................................................................2

DocumentHistory..............................................................................................................................................2

Introduction.......................................................................................................................................................3

IntendedAudience.............................................................................................................................................3

Abbreviations.....................................................................................................................................................3

DECTdeploymentassessment...........................................................................................................................4

DeploymentConsiderations..............................................................................................................................4

Range.....................................................................................................................................................4

CapacityPlanning...................................................................................................................................5

SitePlanning/CellCoverage.............................................................................................................................5

1. UsingtheHandsetforreceptionmeasurement

............................................................................5

2. Placing2

andfollowingbasestation...........................................................................................6

IPconfiguration..................................................................................................................................................7

M700/M5RepeaterPlacementRecommendations..........................................................................................7

M700VoIP/DECTdeploymentlimitations.........................................................................................................9

M700VoIP/DECTNetworkdeploymentconsiderations ...................................................................................9

Installation....................................................................................................................................................13

DECTChain.......................................................................................................................................................15

Document History



Revision Author IssueDate Comments

0.1 TimKoehler 27‐Jun‐2014 InitialVersion

1.0 BenjaminZiebarth 29‐Aug‐2014 InitialRelease



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Introduction



ThisdocumentshallhelptosetupamulticellDECTsystem.BesideDECTandwirelessaspects,italso

addressesnetworkrequirementsandcapacityplanning.



Intended Audience



Thetargetaudienceforthisdocumentincludesnetworkadministratorsandanyonethatwillplanand

designamulticellDECTsolution.



Abbreviations



Forthepurposeofthisdocument,thefollowingabbreviationshold:



DHCP: DynamicHostConfigurationProtocol

(T)FTP: (Trivial)FileTransferProtocol

IOS: InternetworkingOperatingSystem

NAT: NetworkAddressTranslator

PCMA: A‐lawPulseCodeModulation

PCMU: µ‐lawPulseCodeModulation

RPN: RadioFixedPartNumber

RSSI: Receivedsignalstrengthindication

RTP: Real‐timeTransportProtocol

RPORT: ResponsePort(RefertoRFC3581fordetails)

SIP: SessionInitiationProtocol

SME: SmallandMediumscaleEnterprise

SRTP: SecureReal‐timetransportprotocol

STUN: SessionTraversalUtilitiesforNAT

TLS: TransportLayerSecurity(forSIPencryption

VLAN: VirtualLocalAccessNetwork

TOS: TypeofService

(policybasedrouting)

URL: UniformResourceLocator

UA: UserAgent

UTC: CoordinatedUniversalTime(similartoGMTformat)



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DECT deployment assessment



DECTdeploymentassessmentisessentialtodetermineelementsnecessarytoachievetheoverall

expectationsoftheuser.Typicalnetworkrequirementsincludes (butnotlimitedto):



 Thegeographicalareatobecovered

 Thetypeorarchitectureofbuildingand/ortopology,etc.

Thisincludesthematerialofwalls,thicknessof

walls.

 Theestimatedtrafficineachcoveragearea

 Theblockingcriteriaineachcoveragearea.



Deployment Considerations



ThefollowingradiationrelatedconsiderationsmustbeexaminedbeforedeployingatypicalSNOM

M700System.Theseincludes(butnotlimitedto):



BuildingPenetration:



Whenasignalstrikesabuildingitisdiffractedorabsorbed;thereforetosome extendthesignalis

reduced.Theamountofabsorptionisdependentofthe

kindofbuildinganditsenvironment,the

amountofsolidstructure.Thisisanimportantconsiderationincoverageplanning.



Note: Thestructureofthebuildingwillhaveanimpactofcoveragerange.



InterferenceSources:



Signalsfromreceivingantennasareweakenedbyinterferencefromothersignals.Thesesignalsmay

befrom

thesamenetworkorotherobjects.AwellplannedDECTmulticellinstallationshouldidentify

potentialinterferencesourcesforoptimalplacementofBasestationsandrepeaters.



Note: OtherDECTsystemsordevicestransmittingin similarfrequencies,weakensreception.

Thereforeitisrecommendedtosetupbasestationssufficientlyclosetoeach

other.



Radio/CellRange:



Thesuggesteddistancebetweentwobasestationsdependsonthephysicalpathbetweenthebase

stations.Ifthepathlossislessened,e.g.byminimizingamountofwalls/obstaclesinthepath,then

signalsfrombasestationswillcovermoredistance.Inatypicalofficebuildingthesuggested

distance

betweentwobasestationsis20‐40m.



Note: Lessobstaclesbetweentwobasestationsincreasethepossibledistancebetweentwo

basestations.

Range

∙Officeareas:Upto40meters

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∙Officeareaswithobstructionslikeelevatorshafts,stairwells,metalwalls:Upto10meters

∙Shopfloors:Upto60meters

∙Exhibitionhallsorproductionareaswithoutobstacles:Upto100meters

∙Undergroundgarages:Upto20meters

∙Outdoorswithoutobstructions:Upto200

‐300meters(forindooruseonly)

Capacity Planning



Eachbasestationhasamaximumlimitofparallelcalls.



ToavoidinsufficientuserexperiencethroughcongestedDECTnetwork,thecapacityfortheDECT

networkshouldbeplannedinadvance.



Duetodifferentusagepatterns,thenumberofbasestationrequiredtofulfilthedemandofvoice

channelsmayvary.



Thetotalcapacityinthecoverageareaofabasestationisalwayslimitedtothecapacityofasingle

basestation.



Site Planning / Cell Coverage



Theactualcellcoverageandqualityinaninstallationcanbedeterminedwithaspecialhandset

feature,inwhichthehandsetestablishesanaudioloop.

Snomurgentlyrecommendsto



Note: Thisfeaturecanbeusedwithbasestationsinaninfrastructure,butalsowithsingle

basestationswithoutEthernetconnection,

sothefeatureallowstoidentifyobstacles

anddifficultiesinaninstallation.



1. Using the Handset for reception measurement



Beforestartingthedeploymentmeasuringmakesurethehandsetisproperlycharged.Identifythe

MACaddressofthebasestationtowhichyouwanttomeasure.AswellmanuallyreadtheMAC

addressonthebasestationlabelsonthebacksideforthedevicetobeusedwiththe

handset.The

handsetdoesnotneedtobe(pre‐)registeredtoaparticularbase.

1. Press“Menu”followedbythekeys:*47*togetthehandsetintofindbasesmenu.



Note:Stayclosetothebasestationtostartthesearch.

 Narrowband Wideband

Basestation 8calls 4calls

Repeater 5calls 2calls

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2. Usethecursordown/uptoselectthebaseMACaddressforthebasestation.

3. Selecttheintendedbase.

4. Thehandsetdisplaywillshowthe“RSSI”(Receivedsignalstrengthindication)levelofthebase.

5. Optional:Bypressing“hookoff”key(greenkey)

anaudioloopbackconnectionwillbe

establishedwiththebasestation.

Note: ByplugginginaheadsetmodifiedforaMP3playerconnectionaudiofromthe

handset/MP3playerwillbeloopedbacktothehandsetearpiece.Thismakesitpossible

tolistentoaudioatthesametimeasreadingthe

RSSIlevelsofthedisplay.

Snomrecommendsusingabuildingplanandcheckingthebasestationcoverageusingthehandset

signalstrengthindicationRSSIlevelfromeachbasestation.



2. Placing 2

and following base station



Inordertoplacethe2

basestation:

 Placethe1

SNOMM700basestationexactatthedesiredposition,andpoweronthebase

 Setupthehandsetasdescribedinprevioussection.

 UsethebuildingplandrawingandcheckthebasestationcoverageusingthehandsetRSSI

levels.Markuptheacceptablespotsandnon‐acceptablespots

forplacingthe2

basestation

ontheplandrawing.AcceptablespotsarespotswherethehandsetshowsRSSIlevelsbetter

than075dBm(meaninglowernumericnumber)andwhereyouverifiedviaaudioloopback

thatthereceptionisclear.

ItisrecommendedtohaveaRSSIvaluebetterthan/equalto‐75dBm,andnever

below‐90dBm.:

Lowernumericnumberthan075dBmonthehandsetscreen.Pleasenotethattheminusisnot

shownonthescreen.



Typically,installationssuchasofficebuildings,warehousesandhospitalityshouldbeequippedwith

bothbasestationsandrepeatersonseveralfloorstocreateuniformandcompl e teradio

coverage.



Donotlinktwoormoremulticellbasestationviaarepeater.Arepeatershallbeonlyusedtoextend

thecoverageofasinglebasestation.IfEthernetisavailableitisrecommendedtouseamulticell

stationratherthanarepeater.



Openareascanbecoveredwitha

sparsenetworkofbasestations.Insuchapplications,thebase

stationsand/orrepeaterscoveranextendedrangeduetotheextendedline‐of‐sightradiopropagation

capability.

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IP configuration



ThesnomM700canoperateusingavarietyoftheIPnetworksettings,allowingittobeconfiguredfor

differentnetworks.



ThebasestationcanbeconfiguredforeitherdynamicIP‐addressretrievalusingDHCPorsetupfor

usageofafixedIP‐address.Bydefaultdynamicconfigurationisconfigured.



ThebasestationcanalsobeconfiguredforusageofavirtualLAN(VLAN),whichistherecommended

configuration,asadedicatedVLANforvoicetrafficinacorporatenetworkcanprovidethemost

optimalQualityofService(QoS).NoVLANtagisenabledasdefault.TheVLANcanbe

configured

duringbootupviaDHCPOption132(VLANID)andOption133(VLANQoS).



DedicatedQoSsettingsintheIPpacketsforsupportofDiffServ,ToSandcanbeenabledusingthebase

stationconfigurationpageorsnomprovisioning.



ThecommunicationbetweenthebasestationsiseitherIPMulticast

orPeer‐To‐Peercommunication.

IPMulticastisthepreferredoptionasitgeneratestheleasttraffic,butitrequireseitherasingleIP 

subnetorIP‐Multicastpass‐throughinthenetworkswitches.



M700/M5 Repeater Placement Recommendations



Theantennasinthebasestationsareclosetoomnidirectional;therebythereisnoneedtoconsider

howthebasestationsfaceeachotherwhendeployingthem.

Thesearesomerecommendationsforplacementstrategies:



AroundCorridors:

Basestations/repeatershouldbedeployedverticallypreferablyatcorridorintersectionswhere

propagationpatternsfollow

thecorridorpatterns.Incasetherearehighobjectsinthearea,thebase

station/repeatershouldbeinstalledabo v ethoseobjects.



Multi‐StoryBuildings:

Basestationsandrepeaterscanbeinstalledonoppositesidesofthefloorstotakeadvantageofthe

floor‐to‐floorcoverage.Thecoveragedesigncannot

relyentirelyonfloor‐to‐floorpropagation;each

casemustbeverifiedduetovariationsinlocalattenuationpatterns.



LargeHalls:

Basestationsandrepeaterscanbedeployedinlargehallsthatcontainacentralopenspaceareawith

windowstotheotherareas.Thisprovidesagoodcoveragefor

theroomsintheinnercircleonall

floors.Inlargehalls,basestations/repeatershouldbeinstalledverticallyinthemiddleofthespace

belowtheceiling.



MountingPositions:

WhenBasestationsandrepeateraremountedverticallyonawall,theradiocoverageinfrontofthese

devicesistwiceas

largeasthecoverageattherear.Thebasestationsshouldalwaysbemounted

higherthattheobstructiveobjectsinthearea–e.g.minimumhigherthan2mabovefloor.

Repeatersshouldbeinstalledinthemi ddleofcorridorsandsmallrooms.



MetallicStructures/Objects:

Version1.0  Page|8



Basestationsandrepeatersshouldnotbedeployednearlargemetallicobjects.Thisincludesmetallic

inshelvesinwarehouses.



ReinforcedConcreteStructures:

Thesestructuresreducesignalstrengthdramaticallyinsidethebuilding.Theyreducetheradio

coveragerangeoftheBasestationsandrepeatersandtherefore

requireahighernumberofbase

stationsorrepeatersinthebuilding.Lightertypesofconstructionmaterialsrequirefewerbase

stationssinceattenuationfiguresareconsiderablylower.



Version1.0  Page|9



M700 VoIP/DECT deployment limitations



TheM700systemisaverypowerfulDECTsystem.Comparedtomostcompetitorsitdoesnotrequire

specialcontrollersorlicensesforbuildingyourDECTnetwork.Aninstallationcanbeextendedwith

additionalM700basestations.

Duetothehighlyintegra tedsystemandthe“sharing”ofresourcestherearesomelimitations

and

thingstocons iderwhileplanningorextendinganexistinginstallation:

 Onebasestationwillbecomethemasterbasestation,whichwill“organize”theinstallation

andsynchronizetheotherbasestations(slavebasestations)withthenetworktopology.

 Outgoingfromthe“masterbasestation”,amaximumof6

additionalbasestationslevelscan

beinstalled.Thismeansamaximu mof7levelsofbasestationsinaline(row)includingthe

master.

 Themaximumamountofusers/handsets/SIP‐registrationsis200.

Eachbasestationcanholda maximumof30users,soyouneedatleast7basestations

to

achievethemaximuma mountofusers(butmorethan7won’tallowmorethan200users).

 Eachbasestationallowstohave8narrowbandcallsinparallel



M700 VoIP/DECT Network deployment considerations



TodeployamulticellDECTnetwork,therearesomerequirementstofollowandsomelimitations.



AmulticellDECTnetworkisbasedonamaster/slavearchitecture.Themasterbasestationwillensure

thatalltheslavereceivethenetworklayout.Thismeanstheslavecellsare“synchronized”andare

“aware”of

eachothertoallowseamlesshandoverforusershandsets.



Amaximumof7synclevelsaresupported,thatmeansstartingfromthesyncMaster(Level1),youcan

deployandcascadeupto6additionalbasestations(slaves)outgoingfromthemaster.Thismeans,if

youwanttocovera

longcorridor,youshouldsetupthemasterbasestationinthemiddle,thisallows 

thelevelstobeinbothdirections.



Case#1:SynchronisationChainwithOneMasterSync.



Version1.0  Page|10



a) TheSynchronisationchainmustalwaysoverlapwithotherBasestationsinordertolatcheach

other.

b) InthisillustrationBasestation#39istheSyncMaster,RPN00(RadioFixedPartNumber)

c) Amaximumof7synclevels(Includingthemaster

bases)canbeusedinadeployment.

d) TheotherslavebasestationsorrepeatersareconnectedtotheSyncMasterthroughthe

synchronisationchain.

e) Ifoneofthebaseorrepeaterunitsinthesyncchainisbrokenornotworking,thentheunitsthat

followthenon‐working

devicearecutofffromthesyncchain,andair‐interfacesynchronization

canbelost.Whentheairinterfacesynchronizationislosthandoverbetweenthetwoclustersis

notpossible.



Thesynclevelconceptisillustratedbelow,wherebases#08and#02areatsynclevel1,andBS#03is



atlevel2.





Version1.0  Page|11



Case#2:SynchronisationChainwithoutAlternativeSyncPaths



Dependingonthesystemsetup,itisrecommendedtoplacetheSyncsourceMasterinthemiddleof

thebuildingandtoassignnumb ers/addresses,radioID(RPN),etc.toeachbasestationorrepeaterfor

easyidentification.



 Continuousline:Showstheprimarysyncpaths,withtherelevantbaseschained

inthemulti‐

cellnetwork.

 Dottedline:Alternative syncpaths.



Case#3:SynchronisationChainwithAlternativeSyncPaths



Theillustrationbelowshowsamulti‐cellnetworkwithalternativeSynchronisationpaths.Afailureof

onebaseunitdoesnotmeanhandsetoruserscannotperformhandoverstootheractivecells.

Version1.0  Page|12



BS#39istheSYNCMaster, ifBS#05isdown,mostuserhandoverscanbeformedvia3other

alternativecells(i.e.BS#06,BS#02andBS#04),butcannotoperateinthecoverageareaofBS#05

wherenootherbasestationcanreachthehandset.



Furthermore

observethefollowing:

 BS#04andBS#01arelevel1toBS#39.

 BS#05isprimarysynctoBS#04(level2)whilealternativesyncis BS#02inlinewithBS#01

(level3)

 BS#03isprimarysynctoBS#02(level3)whilealternativesyncis BS#06inlinewithBS#05

and

BS#04(level4)



Anotherillustrationbelowshowsamulti‐cellnetworkwithoutalternativesynchronisationpaths.A

failureofonebaseunitwillaffectthefurtherlevelsofthetopology.

Version1.0  Page|13



 BS#24orBS#26cannotreachBS#20(master)directly,butonlythroughBS#25 

 BS#21orBS#23cannotreachBS#20(master)directly,butonlythroughBS#22 



Installation



Startwiththeintendedmasterbasestation.Itisrecommendedtoupdateandresetallbasestations

priortoinstallingtheminamulticellsetup.Secondarybasestationsmustberesettodefaults!

Important:Secondarybasestationsmustnotcontainany(SIP)“Server”inputs.Disabletheoption

“Plug&Play”inthemenu“N

etwork”topreventanautomatedsetupofa(SIP)serverifyouhave

relatedDCHPoptionsrunninginyournetwork.

 Onlyforthemasterbasestation:

Followallstepsfromthe“snomM300andM700administrationandinstallationguide”:

o SetupaSIPserver

o Createauseraccou

nt

o Registerhandsets

 Usethewebbrowsermenuandnavigateto“Time”settings(leftcolumn).Entertherelevant

parametersonthispageandpresstheSavebutton.Makesurethatthe“Timeserver”is

working,otherwisetheMulti‐cellfeaturewillnotwork.



Basestationsmustberebootedaftertheti

meserverhasbeenset.

Version1.0  Page|14



 Navigateto“Multicell”menu.Bydefaultanewbasestationhas“Multicellsettings”feature

disabled.



Descriptionofparameters

Multicellsystem EnablethisoptiontoallowtheBaseunittobesetinmulti‐cellmode(can

besetasmasterorslaveinthemulti‐cellchainsystem). ValidInputs:

Enable,Disable

SystemchainID Thisisanidentifier(usually instringformatfore.g.2275)thatis

unique

foraspecificmulti‐cellsystem.

Note:Therecanbeseveralmulti‐cellsystemsinthenetwork.

ValidInput:8bitStri ng

Synchronizationtime(s) Thisspecifiestheperiodorwindowinseconds elements/nodes(fore.g.

Baseunits)inaspecificMulti‐cellshouldsynchronisetoeachother.



Multi

celldebug Enablethisfeature,ifyouwantthesystemtocataloguelowlevelmulti‐

celldebuginformationortraces.

 EnabletheMulticellsettingfromthedropdownmenu.

 Entertherelevantvaluesfor“SystemchainID”and“Synchronizationtime(s)”respectively.

The“SystemchainID”is

ageographicallyuniqueDECTcellidentityallocatedtobridgeseveral

basestationstogetherinachain.Anexampleis2275.Inonemulticellinstallationallbase

stationsmusthavethesame“SystemchainID”.

TheSynchronizationtime(s)parameterisdefinedaswindow/periodoftimeinsecondsa

specificbase

stationsynchronisestothemasterbasestationunit(bydefault60).

 Clickon“Save”buttontokeepmodifiedchangesofmulticellsettingsintothebasestation.

 Oneachconfigurationinterfaceforthebasestation(s)navigatetothe“Home/Status”page

andClickthe“Reboot”button.

 Repeatall

stepsasexplainedaboveforalltheintendedbasestationsinmulticelloperation.



Ittakesuptomaximum5 minutes(synchronizationtime)toaddanewbasestationtoaMultiCell 

System.



 NavigatebacktotheMulticellsettings pagebyclicking“Multi‐cell”.TherevisedMulti

cell

settingspageshowstherelevantbasestationssynchronizedtogether.Bydefau l t,thesystem

usesthefirstregisteredbasestationasthemasterbaseunit.

 OntheMulti‐cellsettingspage,scrolltotheDECTsystemsettingsandEnableorDisablethe

“AutoconfigureDECTsyncoptionsourcetree”(See

descriptioninthetablebelow).Usually

theDECTsystemRFPIparameterisrecordedbythesystem(It’softengreyedinamulti‐cell

systemconfiguration).



Note:Enablethistoallow thenetworktoautomaticallysynchronisethemulti‐cellchain/tree.

Version1.0  Page|15



DECT Chain



AfteraMulticellinstallati on youcanmanuallyconfigurethesynchronisationsourcetree.Onthe

settingspage,scrolltothe“Multicell”settingsandEnableorDisablethe“AutoconfigureDECTsync

optionsourcetree”.



ID Baseunitidentityinthechained network.

RPN TheRadioFixedPartNumber

isan8‐bitDECTcellidentityallocatedby

theinstaller.TheallocatedRPNwithintheinstallationmustbe

geographicallyunique.Basestations’andrepeater’sRPNmustonlydiffer

onleastsignificantbitsthataremaskedoutbythehandovermask.

MADAddress ContainsthehardwareEthernetMACaddress.Please

refertothe

productlabels.

Version Basestationcurrentfirmwareversion.

Status CurrentBasestationbehaviourintheSMEnetwork.

PossibleOutputs:

‐Connected:TherelevantBasestation(s)isonlineinthenetwork

‐ConnectionLoss:Basestationunexpectedlylostconnectiontonetwork

‐ThisUnit:CurrentBasestationwhosehttpWeb

Interfaceiscurrently

beingaccessed

DECTSync Theadministratorcanchoosetherelevant“multicellchain”level.

Maximumnumberof“multi‐cellchain”levelsis6.

Version1.0  Page|16



Inthedropdownmenuyoucanseethesignalstrengthindicationtoall

otherpossiblebasestations.

DECTProperty Basestationcharacteristicsinconnectiontothecurrentmulticell

network.PossibleOutput(s)

‐Primary:Masterbasestationuntowhichallothernodesin thechain



synchronisesto.

‐Locked:TheBaseunitiscurrentlysynchronized andlockedtothemaster

Baseunit.

‐Searching:BaseunitintheprocessoflocatingtoaMaster/slaveas

specifiedinDECTsyncsource.

‐FreeRunning:AlockedBaseunitthatsuddenlylostsynchronisationto

theMaster.

‐Unknown:

NocurrentconnectioninformationfromspecificBaseunit.

ItisrecommendedtohaveaRSSIvaluebetterthan/equalto‐75dBm,andneverbelow‐90dBm.



Nextstepinvolvesaddingextensionstothesystem.Followallstepsfromthe“snomM300andM700

administrationandinstallationguide”.

Snom M700 User manual

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