Calrec BRIO 36, Installation Manual

Page: 40 / 72

40 BRIO 36
Audio Production System with Optional Networking
Connection Information
FIBRE SFP CONNECTIVITY
Optical SFP modules for fibre
connectivity can be used for console
to processing core, router to router,
and router to I/O connections.
Fibreconnectivityisrequiredwhenthe
cablerunbetweenunitsexceedsthe90m
maximumpermissiblelengthforCat5e/
Cat6coppercabling.Fibrecanalsobe
usedforshorterrunsifitissimplythe
preferredmedium.
Note,thissectiononlyconcernsfibre
connectionsmadeviaSFPs.LikeallI/O
boxes,MADIunitshavepluggableSFPs
fortheirHydra2connectionstorouters,
buttheyalsohavefibreconnectorsthat
passtheactualMADIaudioformatinand
outofthesystem.TheMADII/Oformat
fibreconnectorsareofafixedtypewhich
hasnorelationtoSFPchoice.Various
MADII/Oboxesareavailabletoprovide
differenttypesofMADIfibreinterface.
PleaserefertotheHydra2installation
manualformoredetailsonMADII/O
options.
SinglemodevsMultimode
Thecorewithinmultimodefibreis
relativelythickwhencomparedto
singlemode.Lighttravelsthrough
multimodefibreatmultipleangles,
‘bouncing’offthesidesofthecoreasit
travels,takingmultiplepathsor‘modes’of
varyinglengthfromoneendtotheother,
resultinginpulsesbeinglengthenedas
theytravel.Singlemodefibrehasavery
finecoreandlighttravelsinasingle,direct
pathfromoneendtotheotherwithout
affectingpulselength.Theresultisthat
singlemodefibrehasahigherbandwidth
capacityand,importantly,lowsignal
lossallowingmuchgreaterdistancesto
beachieved.Lightcanbetransmitted
intomultimodefibreusingLEDsorlow
poweredlaserswhilstsinglemoderequires
ahigherpoweredlaser.
Calrecrecommendtheuseofsinglemode
fibrewheneverpossibleinorderto
maximisetheflexibilityinthelocationof
hardwareandmaintainuniformityacross
thesystembyusingasingletype.Ifa
multimodeinfrastructureisinplace,fibre
length,thenumberofinter-connects
andequipmentlocationbecomemore
important.
SFPmodulesareavailableforboth
singlemodeandmultimodefibretypes.
Itisimportanttoselectthecorrect
SFPforthetypeoffibrebeingusedin
theinstallation.Ifusingamixtureof
singlemodeandmultimodefibre,itis
importanttoensurethecorrectSFPsare
matchedtothecorrectfibretype.
Identification
Thereleasebutton/handlesoffibreSFPs
arecolourcoded-Blueforsinglemode,
Blackformultimode.BlueLCconnectors,
asshownhere,shouldbeusedto
terminatesinglemodefibreandbeige
colouredconnectorsformultimode.
DuplexConnectors/Terminations
StandardCalrecfibreSFPs,both
multimodeandsinglemode,useduplex
LCconnectors.Theduplextermination
requirestwofibresperconnection,one
isasendpath,theotherisareceivepath.
Whenterminatingthefibre,thesendfrom
oneendshouldconnecttothereceiveof
theotherandthereforethey‘cross-over’,
terminatedAtoBandBtoA.
SingleStrand,Bi-DirectionalSFPs
Toreducetheamountoffibre,Calrec
cansupplysinglemodeSFPsthatsend
andreceiveoverasingle,orsimplexLC
connector.Inordertobeabletopass
datainbothdirectionsoverasingle
strand,thelighttravellinginonedirection
needstobeofadifferentwavelengthto
thelighttravellingintheotherdirection.
Therefore,Bi-DirectionalSFPscome
aseithertypeAortypeB(asindicated
byanAorBattheendofthemodel
number)andtheyneedtobepairedup;
afibreshouldconnectbetweenatype
AandatypeB,andnotbetweentwo
Bi-DirectionalSFPsofthesametype/
wavelength.Theunitsarecolourcoded
toaididentificationbetweenAtypes&B
types.
SFPFibreSpecifications
Specificationsareshowninthetable
totheright.Themaximumdistances
shownhereassumeasinglepoint-to-
pointconnectionwithnointermediary
interconnections.Lossesshouldbe
measuredacrossthetotalsignalpath
includinginterconnects-betweenpoints
ofSFPtransceiverconnection.Losses
needtobelessthantheopticalpower
budgetoftheSFPtransceiversbeing
used.
DUPLEX LC FIBRES CORRECTLY TERMINATED A TO B & B TO A
BI-DIRECTIONAL LC FIBRE CORRECTLY CONNECTED, TYPE A TO TYPE B
A
A B
B
A B