Specifications

3. Network & Redundancy concept
Based on the system specication list in the previous
chapter the following Yamaha System Solutions design
concept is proposed.
Network
The Yamaha System Solutions design concept uses
CobraNet™ audiodevices.All devices areconnected to
a Gigabit Ethernet network using a star topology. The
network uses managed switches supporting VLAN and
RapidSpanningTreeProtocols.
VLAN
ThenetworkisdividedintwoVLANs:oneforCobraNet™
andoneforcontrol.Ifasystemrequirestheuseofmany
multicastbundles,additionalVLANscanbeincluded.
Switches
A high capacity and a low capacity switch supporting
Gigabitconnectivityareusedtobuildthenetwork.
Bothswitchessupport IEEE802.1qVLAN,IEEE802.1w
rapid spanning tree, IEEE802.3ad link aggregation and
QoSfunctionality.
Star locations
AhighcapacityswitchincludingatleastfourGBICports
forGigabitberconnectivityisusedforthestarlocation.
Such a high capacity switch is typically not available
withoutcoolingfans,sothislocationshouldbeplannedin
aplacewhereacousticnoiseisnotaproblemsuchasthe
amplierrack.
End locations
Alowcapacityswitchincludingatleasteight100MbRJ45
ports,oneGigabitRJ45portandoneGBICportforGigabit
berconnectivityisusedforallotherlocationsattheends
ofthestarnetwork.Theeight100Mbportsaredividedin
sixportscarryingtheCobraNet™VLAN,andtwoports
carryingthecontrolVLAN.Theswitchshouldnothave
coolingfanssoitcanbeusedinnoise-freeconditionson
stageorattheFOHpositionintheaudience.
Cabling
Alllongdistancecablingfromthestartothefourlocations
carrying Gigabit network information is specied with
50 µmmultimode ber,connectedtotheswitches using
appropriateGBICber modules. Fordistancesunder50
metersCAT5Ecablingcanbeusedinstead.
All furtherconnections in the system use CAT5cabling
carrying100Mbnetworkinformation.
Redundancy
All locations use double switches, labelled primary and
secondary,  with a Gigabit link between them. The two
switchesareconnectedtothestarlocationbytwocables,
preferably laid out over differentphysical pathsthrough
the venue. All CobraNet™ devices’ primary links are
connectedtotheprimaryswitch,andthesecondarylinks
tothe secondary switch.In the starlocation’s secondary
switchtheRapidSpanningTreeProtocolisactive.
Star location
Endlocation
Endlocation
Endlocation
Endlocation
Ethernetdevice
Cobranet™device
Ethernetdevice
Ethernetdevice
Ethernetdevice
Secondary link
Primary link
Ethernetdevice
Cobranet™device
Cobranet™device
Cobranet™device
Cobranet™device
Cobranet™device
Cobranet™device
Cobranet™device
Cobranet™device
Cobranet™device