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Bandwidth,Inter-SwitchLinksandLargerNetworks
Networktopologyandbandwidthmanagementareimpactednotjustbythequantity,butalsobythephysicallocationofdevices.
EachcopperEthernetcableshouldbelessthan100mtotallength(factoringincableroutingandlooming,sooften90misquoted).
FibreSFPportsoradditionalswitchhopsneedtobeusedtoextendtherangebeyond100m.
Whereswitchesareconnectedtogether,oneshouldbemindfulofthebandwidthavailableontheinter-switchlinks.
Multiplelinkscanbefittedbetweenswitchesastrunkstoincreasebandwidth(switchesneedtobeappropriatelyconfiguredto
supportsuchconnectionsusingLACPlinkaggregation),andmanyswitcheshaveapairormoreofSFPslotsthatarecapableof
higherbandwidth,intendedtobeusedtoconnecttootherswitches.
Onthe10(8+2)portQuarraswitchesthatCalreccurrentlyuse,2oftheportsareSFPslotsthatcanbefittedwitheither1Gbpsor
2.5GbpsSFPinterfaces.NotethatswitchesarenotsuppliedwiththeSFPinterfaces.
AsageneralruleofthumbforAoIP,audiotrafficshouldnotexceedroughly50%ofthecapacityonalink.
Thisbroadlyequatesto256channelsofaudioovera1Gbpslink.Thisisasomewhatconservativeguideline,butitisasafe
recommendationforcriticalliveaudioapplicationsuchasbroadcast.
Audioisnottheonlydatabeingpassed,evenonadedicatedaudionetworkthereisstilladditionaltraffic.Higherchannelcountscan
beachieved,butdeterministicnetworkconditionsarerequiredtosuccessfullyexceedthesafeworkingrecommendations.
TypeRCorescanpassupto256audiochannelsovereachAoIPInterfacecard.
Using32x8channelstreams(at32bit/48kHz/125uspackettime),thebandwidthconsumptionofaudioforeachportwouldbe
554Mbps.With2cardsfitted,theoverallaudioconsumptionofaTypeRcorecanpotentiallybemorethan1Gbps
Iflargeamountsofaudio/datahavetopassoveragivennetworksegmentsuchasaninter-switchlink,thenhigherbandwidthSFPs
shouldbeusedforthosesegments(ormultipleaggregatedlinks).
TypeRI/OboxeshaveasingleredundantpairofAoIPports,capableofpassingupto64channelsofaudio.
AsthelargestTypeRI/Oboxesonlyhave16channelsofphysicalaudioI/Oports,typicalactualusagewouldbeonly35Mbps.
Ifrequired,audiobandwidthcanbereducedbyusinga1mspackettime(atthecostofincreasedlatency),orbyusing24bitaudio
(sacrificingtheadditionalheadroomweprovideforourmicinputs).
Forlargernetworkswithlotsofswitches,insteadofdaisy-chainingthemtogether,theyshouldconnectviaanadditionalswitch,as
showninExamples6,7,11,12and13,inordertolimitthenumberofswitchesthatdatahastopassthroughtogetfrompointAto
pointB,providingmoreuniformlatency,andmakingbandwidthsimplertomanage.
ThedottedlinesshowninExample6representtheoptiontoincreasebandwidthonswitchlinksthroughaggregationifneeded.
Summary of Contents for TYPE R
Page 1: ...calrec com Radio Production System TYPE R INSTALLATION MANUAL...
Page 5: ...calrec com TYPE R INFORMATION...
Page 10: ...10 TYPE R Radio Production System...
Page 11: ...calrec com TYPE R START UP GUIDE...
Page 32: ...32 TYPE R Radio Production System...
Page 33: ...calrec com TYPE R CONTROL SURFACE DIMENSIONS...
Page 40: ...40 TYPE R Radio Production System...
Page 41: ...calrec com TYPE R FIXING BRACKET ASSEMBLY INSTRUCTIONS...
Page 58: ...58 TYPE R Radio Production System...
Page 59: ...calrec com TYPE R SYSTEM ELEMENTS...
Page 67: ...67...
Page 70: ...70 TYPE R Radio Production System...
Page 71: ...calrec com TYPE R SYNC AUDIO GPIO CONNECTIONS...
Page 79: ...calrec com TYPE R CORE DSP PACK OPTIONS...
Page 89: ...calrec com TYPE R SURFACE PANEL LAYOUT EXAMPLES...
Page 91: ...91 EXAMPLE 1 12 FADER SURFACE...
Page 92: ...92 TYPE R Radio Production System Surface Panel Layout Examples EXAMPLE 2 18 FADER SURFACE...
Page 93: ...93 EXAMPLE 3 24 FADER SURFACE...
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Page 101: ...calrec com TYPE R AOIP NETWORK EXAMPLES...
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Page 120: ...120 TYPE R Radio Production System AoIP Network Examples...
Page 121: ...calrec com TYPE R SOFTWARE UPDATER...
Page 125: ...calrec com TYPE R SPECIFICATIONS...