2. Fiberplex
  3. FOM-1091

Fiberplex FOM-1091, FOM-1090 User manual

  • Hello! I've reviewed the FiberPlex user manual for the FOM-1090 and FOM-1091 fiber optic isolator/modems. This document details the installation, operation, and technical specifications for these devices, including their support for multiple serial interfaces and electrical standards. I'm ready to answer your questions about the capabilities, setup, troubleshooting, or other aspects of these products, and help you understand the diverse range of features and configurations.
  • What serial interfaces are supported?
    What electrical standards are supported?
    What is the difference between FOM-1090 and FOM-1091?
    Can I use non-MSA compliant SFP modules?
    Where can I find warranty or service information?

USERMANUAL
Multi‐StandardInterfacefor
SerialDataCommunications
FOM‐1090
/
FOM‐1091
WarningforYourProtection
1.Readtheseinstructions.
2.Keeptheseinstructions.
3.Heedallwarnings.
4.Followallinstructions.
5.Donotusethisapparatusnearwater.
6.Cleanonlywithadrycloth.
7.Donotblockanyoftheventilationopenings.Installinaccordancewiththemanufacturer’sinstructions.
8.Donotinstallnearanyheatsourcessuchasradiators,heatregisters,stoves,orotherapparatus(includingamplifiers)thatproduceheat.
9.Onlyuseattachments/accessoriesspecifiedbythemanufacturer.
10.Unplugthisapparatusduringlightningstormsorwhenunusedforlongperiodsoftime.
11.Referallservicingtoqualifiedservicepersonnel.Servicingisrequiredwhentheapparatushasbeendamagedinanyway,suchaspower‐supply
cordorplugisdamaged,liquidhasbeenspilledorobjectshavefallenintotheapparatus,theapparatushasbeenexposedtorainormoisture,does
notoperatenormally,orhasbeendropped.
Theapparatusshallnotbeexposedtodrippingorsplashing.Noobjectsfilledwithliquids,suchasvases,shallbeplacedontheapparatus.
“WARNING:Toreducetheriskoffireorelectricshock,donotexposethisapparatustorainormoisture.”
GeneralInstallationInstructions
Pleaseconsiderthesegeneralinstructionsinadditiontoanyproduct‐specificinstructionsinthe“Installation”chapterofthismanual.
Unpacking
Checktheequipmentforanytransportdamage.Iftheunitismechanicallydamaged,ifliquidshavebeenspilledorifobjectshavefallenintothe
unit,itmustnotbeconnectedtotheACpoweroutlet,oritmustbeimmediatelydisconnectedbyunpluggingthepowercable.Repairmustonlybe
performedbytrainedpersonnelinaccordancewiththeapplicableregulations.
InstallationSite
Installtheunitinaplacewherethefollowingconditionsaremet:
Thetemperatureandtherelativehumidityoftheoperatingenvironmentmustbewithinthespecifiedlimitsduringoperationofthe
unit.Valuesspecifiedareapplicabletotheairinletsoftheunit.
Condensationmaynotbepresentduringoperation.Iftheunitisinstalledinalocationsubjecttolargevariationsofambient
temperature(e.g.inanOB‐van),appropriateprecautionsmustbetaken.
Unobstructedairflowisessentialforproperoperation.Ventilationopeningsoftheunitareafunctionalpartofthedesignandmust
notbeobstructedinanywayduringoperation(e.g.‐byobjectsplaceduponthem,placementoftheunitonasoftsurface,or
improperinstallationoftheunitwithinarackorpieceoffurniture).
Theunitmustnotbeundulyexposedtoexternalheatsources(directsunlight,spotlights).
AmbientTemperature
UnitsandsystemsbyFiberPlexaregenerallydesignedforanambienttemperaturerange(i.e.temperatureoftheincomingair)of+5...+40°C.
Whenrackmountingtheunits,thefollowingfactsmustbeconsidered:
Thepermissibleambienttemperaturerangeforoperationofthesemiconductorcomponentsis0°Cto+70°C(commercial
temperaturerangeforoperation).
Theairflowthroughtheinstallationmustallowexhaustairtoremaincoolerthan70°Catalltimes.
Averagetemperatureincreaseofthecoolingairshallbeabout20C°,allowingforanadditionalmaximum10C°increaseatthe
hottestcomponents.
Ifthecoolingfunctionoftheinstallationmustbemonitored(e.g.forfanfailureorilluminationwithspotlamps),theexhaustairtemperaturemust
bemeasureddirectlyabovethemodulesatseveralplaceswithintheenclosure.
Warranty,ServiceandTermsandConditionsofSale
ForinformationaboutWarrantyorServiceinformation,pleaseseeourpublished‘TermsandConditionsof
Sale’.Thisdocumentisavailableonfiberplex.comorcanbeobtainedbyrequestingitfrom
[email protected]orcalling301.604.0100.
Disposal
DisposalofPackingMaterials
Thepackingmaterialshavebeenselectedwithenvironmentalanddisposalissuesinmind.Allpackingmaterial
canberecycled.Recyclingpackingsavesrawmaterialsandreducesthevolumeofwaste.Ifyouneedto
disposeofthetransportpackingmaterials,recyclingisencouraged.
DisposalofUsedEquipment
Usedequipmentcontainsvaluablerawmaterialsaswellassubstancesthatmustbedisposedof
professionally.Pleasedisposeofusedequipmentviaanauthorizedspecialistdealerorviathepublicwaste
disposalsystem,ensuringanymaterialthatcanberecycledhasbeen.Pleasetakecarethatyourused
equipmentcannotbeabused.Afterhavingdisconnectedyourusedequipmentfromthemainssupply,make
surethatthemainsconnectorandthemainscablearemadeuseless.
Disclaimer
Theinformationinthisdocumenthasbeencarefullycheckedandisbelievedtobeaccurateatthetimeof
publication.However,noliabilityisassumedbyFiberPlexforinaccuracies,errors,oromissions,norforlossor
damageresultingeitherdirectlyorindirectlyfromuseoftheinformationcontainedherein.
Introduction
TheFOM‐1090andFOM‐1091fiberopticisolator\modemcardsprovidesforfullsynchronous,asynchronous,
orisochronousinterfacingtoserialdatacommunicationsequipment.Theunitistransparenttoalldata
formatsandprotocol,andsupportstimingfromtheDCEandDTEaswellasuncommonclockingstylessuchas
gappedclockorgatedclocksthatstopindifferentstatestoindicatestatus.Thestatusanddirectionofall
supportedsignalsisshownonfrontpanelindicatorsinadditiontopowersupplyandopticallinkstatusfor
eachcard.
KeyFeatures
SupportedSerialInterfaces:
o TIA‐530&TIA‐530A
o TIA‐232
o TIA‐574,withadaptercable
o TIA‐449,withadaptercable,usingcommonsubsetofcontrolsignals
o V.35,withadaptercable
o X.21,withadaptercable
SupportedElectricalStandards:
o TIA‐422/V.11/FED‐STD‐1030A
o TIA‐423/V.10/FED‐STD‐1020A
o TIA‐232/V.28
o V.35
o MIL‐STD‐100
o MIL‐STD‐188‐114A,Balancedtypes1and2(inV.11mode)
o MIL‐STD‐188‐114A,Unbalanced(inV.10mode)
o MIL‐STD‐188C(Limitedcompatibility–seesectiononCompatibilitywithMIL‐STD
Circuits)
ChassisMountedforHighDensityApplications
DifferencesbetweenFOM‐1090andFOM‐1091
TheFOM‐1091mateswithandconvertstoDCE.
TheFOM‐1090mateswithandconvertstoDTE.
GettingStarted
InitialInspection
Immediatelyuponreceipt,inspecttheshippingcontainerfordamage.Thecontainershouldberetaineduntil
theshipmenthasbeencheckedforcompletenessandtheequipmenthasbeencheckedmechanicallyand
electrically.Iftheshipmentisincomplete,ifthereismechanicaldamage,oriftheunitfailstooperatenotify
FiberPlexandmaketheshippingmaterialsavailableforthecarrier'sinspection.
RearIndicators/Connections
Figure1FOM‐1090(left)andFOM‐1091(right)RearFaces
ChassisMountingScrews(x2)–ThesecaptivefastenerssecuretheFOMcardinthechassis.Theheads
areknurledsothatnotoolisrequiredformounting/dismounting.
OpticsStatusLED–ThisLED,foreachposition,indicatesstatusasperthefollowingtable;
OpticsStatusLED
Status Description
SteadyGreen Opticsinsyncateachendoflink
FlashingGreen LocalopticalRXisreceivingerrors
SteadyYellow RemoteopticalRXlossofsignalorsync
FlashingYellow LocalopticalRXsignalpresent,butnosync
FlashingOrange Cardtypemismatchatremoteend;thetwocardsarenotcompatible
SteadyRed NoopticalRXsignal
Off Cardfailure
1
2
StatusLED–ThisLED,foreachposition,indicatesstatusasperthefollowingtable;

DTEConnector& DCEConnector–ConnectDataTerminalEquipmentandDataCommunications
Equipmentattheseports.TheDTEisafemale(sockets),D‐subminiature,25‐positionconnector;theDCEis
similar,butmale(pins).Jackscrewsareprovidedforsecurement.Seepinoutbelow.
Pinouts(TIA‐530,TIA‐530A[422])
Pin FOM‐1091
(DCE)Direction
FOM‐1090
(DTE)Direction
TIA‐530Configuration TIA‐530AConfiguration
1  ChassisGround ChassisGround
7  SignalGround SignalGround
2 Out In SendDataA(SD)(V.11) SendDataA(SD)(V.11)
14 SendDataB(SD\)(V.11) SendDataB(SD\)(V.11)
3 In Out ReceiveDataA(RD)(V.11) ReceiveDataA(RD)(V.11)
16 ReceiveDataB(RD\)(V.11) ReceiveDataB(RD\)(V.11)
4 Out In RequestToSendA(RTS)(V.11) RequestToSendA(RTS)(V.11)
19 RequestToSendB(RTS\)(V.11) RequestToSendB(RTS\)(V.11)
5 In Out ClearToSendA(CTS)(V.11) ClearToSendA(CTS)(V.11)
13 ClearToSendB(CTS\)(V.11) ClearToSendB(CTS\)(V.11)
20 Out In TerminalReadyA(TR)(V.11) TerminalReady(TR)(V.10)
23 TerminalReadyB(TR\)(V.11) ‐
6 In Out DataSetReadyA(DSR)(V.11) DataSetReady(DSR)(V.10)
22 DataSetReadyB(DSR\)(V.11) IncomingCall(IC)(V.10)
24 Out In TerminalTimingA(TT)(V.11) TerminalTimingA(TT)(V.11)
11 TerminalTimingB(TT\)(V.11) TerminalTimingB(TT\)(V.11)
8 In Out ReceiverReadyA(RR)(V.11) ReceiverReadyA(RR)(V.11)
10 ReceiverReadyB(RR\)(V.11) ReceiverReadyB(RR\)(V.11)
15 In Out SendTimingA(ST)(V.11) SendTimingA(ST)(V.11)
12 SendTimingB(ST\)(V.11) SendTimingB(ST\)(V.11)
17 In Out ReceiveTimingA(RT)(V.11) ReceiveTimingA(RT)(V.11)
9 ReceiveTimingB(RT\)(V.11) ReceiveTimingB(RT\)(V.11)
18 Out In LocalLoopback(LL)(V.10) LocalLoopback(LL)(V.10)
25 In Out TestMode(TM)(V.10) TestMode(TM)(V.10)
21 Out In RemoteLoopback(RL)(V.10) RemoteLoopback(RL)(V.10)
Note:OntheTIA‐530AinterfacetheDMandTRsignalsbecomesingle‐endedandthesingle‐endedsignalICis
added.

PowerStatusLED
Status Description
SteadyGreen Cardpowersupplynormaloperation
SteadyRed Cardpowersupplyfailureorinover‐currentprotection
Off Cardfailureormainpowerfailure
3
4 5
Pinouts(TIA‐449withadaptercableinformation)
Pin FOM‐1091
(DCE)Direction
FOM‐1090
(DTE)Direction
TIA‐449Configuration DB‐37Pin
1  ChassisGround 1
7  SignalGround 19,20,37
2 Out In SendDataA(SD)(V.11) 4
14 SendDataB(SD\)(V.11)22
3 In Out ReceiveDataA(RD)(V.11) 6
16 ReceiveDataB(RD\)(V.11) 24
4 Out In RequestToSendA(RTS)(V.11) 7
19 RequestToSendB(RTS\)(V.11) 25
5 In Out ClearToSendA(CTS)(V.11) 9
13 ClearToSendB(CTS\)(V.11) 27
20 Out In TerminalReadyA(TR)(V.11) 12
23 TerminalReadyB(TR\)(V.11) 30
6 In Out DataSetReadyA(DSR)(V.11) 11
22 DataSetReadyB(DSR\)(V.11)29
24 Out In TerminalTimingA(TT)(V.11) 17
11 TerminalTimingB(TT\)(V.11) 35
8 In Out ReceiverReadyA(RR)(V.11) 13
10 ReceiverReadyB(RR\)(V.11) 31
15 In Out SendTimingA(ST)(V.11) 5
12 SendTimingB(ST\)(V.11) 23
17 In Out ReceiveTimingA(RT)(V.11) 8
9 ReceiveTimingB(RT\)(V.11) 26
18 Out In LocalLoopback(LL)(V.10) 10
25 In Out TestMode(TM)(V.10) 18
21 Out In RemoteLoopback(RL)(V.10) 14
Note:Forbestsignalperformancedonottiepin20(ReceiveCommon),pin37(SendCommon),orpin19
(SignalGround)togetherattheDB‐37connector.Bringallthreepinsbackonindividualconductorstopin7of
theDB‐25andtiethemtogetherthere.
Pinouts(TIA‐232;TIA‐574withadaptercableinformation)
Pin FOM‐1091
(DCE)Direction
FOM‐1090
(DTE)Direction
TIA‐232Configuration TIA‐574DB‐9Pin
1  ChassisGround ‐
7  SignalGround 5
2 Out
‐
In
‐
TD(V.28) 3
14 ‐ ‐
3 In
‐
Out
‐
RD(V.28) 2
16 ‐ ‐
4 Out
‐
In
‐
RTS/RS(V.28) 7
19 ‐ ‐
5 In
‐
Out
‐
CTS/CS(V.28) 8
13 ‐ ‐
20 Out
‐
In
‐
DTR/TR(V.28) 4
23 ‐ ‐
6 In
In
Out
Out
DSR/DM(V.28) 6
22 RI/IC(V.28) 9
24 Out
‐
In
‐
TT(V.28) ‐
11 ‐ ‐
8 In
‐
Out
‐
DCD/RR(V.28) 1
10 ‐ ‐
15 In
‐
Out
‐
ST(V.28) ‐
12 ‐ ‐
17 In
‐
Out
‐
RT(V.11) ‐
9 ‐ ‐
18 Out In LL(V.28) ‐
25 In Out TM(V.28)‐
21 Out In RL(V.28) ‐
Pinouts(X.21withadaptercableinformation)
Pin FOM‐1091
(DCE)Direction
FOM‐1090
(DTE)Direction
X.21Configuration DB‐15Pin
1  ChassisGround 1
7  SignalGround 8
2 Out In SendDataA(SD)(V.11) 2
14 SendDataB(SD\)(V.11)9
3 In Out ReceiveDataA(RD)(V.11) 4
16 ReceiveDataB(RD\)(V.11) 11
4 Out In RequestToSendA(RTS)(V.11) ‐
19 RequestToSendB(RTS\)(V.11) ‐
5 In Out ClearToSendA(CTS)(V.11) ‐
13 ClearToSendB(CTS\)(V.11) ‐
20 Out In INDA(TR)(V.11)3
23 INDB(TR\)(V.11) 10
6 In Out DMA(V.11)‐
22 DMB(V.11) ‐
24 Out In TerminalTimingA(TT)(V.11) ‐
11 TerminalTimingB(TT\)(V.11) ‐
8 In Out CONA(V.11) 5
10 CONB(V.11) 12
15 In Out BTA(ST)(V.11) 7
12 BTB(V.11) 14
17 In Out STA(V.11) 6
9 STB(V.11) 13
18 ‐ ‐ ‐ ‐
25 ‐ ‐ ‐ ‐
21 ‐ ‐ ‐ ‐
Notes:
TheX.21STsignalwillberoutedthroughtheFOMlabeledasRT(pins17&9)asthiswouldbethe
equivalentclockforconversiontootherinterfaces.TheBTsignalisroutedthroughontheSTsignal(pins15
&12).TheBTsignalmaynotbepresentonsomeX.21interfaces.
TheFOMsignalTTisavailableontheDB25connector,butthereisnoequivalentsignalassignedtotheX.21
interface.SomeX.21interfacessupportacompanionclocksourcedfromthesameendastheTDsignal,
usingtheBTpinsforthatclock.TheTTsignalmaybeusedforthatclockinthosecases.
TheFOMsignalsRS,CS,andDMareavailableontheDB25connector,buttherearenoequivalentsignals
assignedtotheX.21interface.ThesesignalsmayalternatelybeusedfortheCONTROLandINDICATION
signalstoallowforadaptingflowcontroltoanon‐X.21interfaceattheoppositeend.

Pinouts(V.35withadaptercableinformation)
Pin FOM‐1091
(DCE)Direction
FOM‐1090
(DTE)Direction
V.35 M‐34Pin
1  ChassisGround A
7  SignalGround B
2 Out In TDA(V.35)P
14 TDB(V.35) S
3 In Out RDA(V.35) R
16 RDB(V.35) T
4 Out
‐
In
‐
RTS/RS(V.28) C
19 ‐ ‐
5 In
‐
Out
‐
CTS/CS(V.28) D
13 ‐ ‐
20 Out
‐
In
‐
DTR/TR(V.28) H
23 ‐ ‐
6 In
In
Out
Out
DSR/DM(V.28) E
22 RI/IC(V.28) J
24 Out In TTA(V.35) U
11 TTB(V.35) W
8 In
‐
Out
‐
DCD/RR(V.28) F
10 ‐ ‐
15 In Out STA(V.35) Y
12 STB(V.35) AA
17 In Out RTA(V.28) V
9 RTB(V.28) X
18 Out In LL(V.28) L
25 In Out TM(V.28)NN
21 Out In RL(V.28) N
InterfaceStatusLED–ThisLEDwillflashafixednumberoftimesindicatingtheselectedinterfacemode.
ItwillbeyellowforaDCEunitandorangeforaDTE.Itwillbesolidredforadisabledinterface(Seesection
“DIPSwitchSettings”,subsection“ConfiguringDIPSwitchParameters”formoreinformation).
OpticalFiberConnections–ThispositionmaybeapairofSTconnectors,LCconnectorsoranSFPslot,if
soordered.
SFPMSACompliance
TheSFPMultisourceAgreement(MSA)isanagreementthatwasdraftedamongcompetingmanufacturersof
SFPopticalmodules.TheSFFCommitteewasformedtooverseethecreationandmaintenanceofthese
agreementsincludingtheSFPMSAdesignatedasINF‐8074i.Thisagreementdescribesamutuallyagreedupon
standardfortheformandfunctionofSFPmodules.However,notallSFPsproducedareMSAcompliant.The
MSAprovidesforatransceiver(TX/RX)pinout.OtherindustriessuchasbroadcasthadtheneedfordualTX
anddualRXSFPforuni‐directionalapplicationssuchasvideo.Naturally,anon‐MSAstandardwasintroduced
allocatingpinoutassignmentsfordualoutputanddualinputI/Oconfigurations.Inaddition,thesomeofthe
internalserialcommunicationpinswerereassigned.
TheFOM‐1090/1091willonlyacceptMSAcompliantSFPModules.
6
7
FrontDisplays
Figure2FOM‐1090(left)andFOM‐1091(right)Displays
TheseLEDsindicatesstatusasperthefollowingtable
Display
LEDs
 
Label Status Description
Power SteadyGreen Cardpowersupplynormaloperation
SteadyRed Thepowersuppliesonthecardarenotregulatingthecorrectvoltagesorthere
isanopenfuseonthecard.Unplugthepowerfromthecardfor30secondsand
thenplugitinagainsothatthefuseonthecardhastimetoreset.IfthePower
ledisstillredornotaconstantgreen,replacethecard.
Off Cardfailureormainpowerfailure
Optics SteadyGreen Opticsinsyncateachendoflink
FlashingGreen LocalopticalRXisreceivingerrors
SteadyYellow RemoteopticalRXlossofsignalorsync
FlashingYellow LocalopticalRXsignalpresent,butnosync
FlashingOrange Cardtypemismatchatremoteend;thetwocardsarenotcompatible
SteadyRed NoopticalRXsignal
Off Cardfailure
SWOption SteadyGreen Optionalswitchsettingisinuse
FlashingRed CardisinLoopBackmode
Off Nooptionalswitchsettingisinuse;textisturnedoff
TD Flashing Datatransitionsdetected
RD Steady DatainsteadySPACEcondition
Off DatainsteadyMARKcondition
TT Flashing Clocktransitionsdetected
RT Steady ClockinsteadyOnstate
ST Off ClockinsteadyOffstate
DataInvert SteadyGreen Optionaldatainvertinuse–typicallyusedforMILinterfaces
Off Nooptionaldatainvert–normaloperation;textisturnedoff
DataRegen SteadyGreen OptionalTDsignalregenerationinuse–FOM‐1091only
FlashingRed OptionalTDregenerationconfigurationerror
Off NoTDregeneration–normaloperation;textisturnedoff
RS Steady ControlsignalinOnstate
CS Off ControlsignalinOffstate
TR Yellow/Orange/Red YellowforaDCEunit,OrangeforaDTE;solidRedisadisabledinterface
DM Yellow/Orange/Red YellowforaDCEunit,OrangeforaDTE;solidRedisadisabledinterface
RR Yellow/Orange/Red YellowforaDCEunit,OrangeforaDTE;solidRedisadisabledinterface
LL Yellow/Orange/Red YellowforaDCEunit,OrangeforaDTE;solidRedisadisabledinterface
RL Yellow/Orange/Red YellowforaDCEunit,OrangeforaDTE;solidRedisadisabledinterface
PowerRequirementsandMounting
FlexiblemountingallowstheFOM‐1090andFOM‐1091tobemountedinanyofanumberofFOM‐series
chassis.
ChassismountingusingRMC‐5000
Combinationsofupto16FiberPlexFOM‐seriescardsmaybeinstalledintoaRMC‐5000rackchassis.Aloaded
RMC‐5000isshownbelow;
Figure3FOMCardbeinginstalledintoanRMC‐5000
StandaloneusingSAC‐1‐AC
SingleFOM‐seriescardsmaybeinstalledintotheSAC‐1chassis,eitherdesk,wall,orrackmounted,depending
ontheaccessorybrackets(includedineverySAC‐1shipment)utilized.
TM Yellow/Orange/Red YellowforaDCEunit,OrangeforaDTE;solidRedisadisabledinterface
IC Steady ControlsignalinOnstate
Off ControlsignalinOffstate
Figure4FOMCardbeinginstalledinaSAC‐1‐AC
InsertingandRemovingSFPModules
IdentifytheLatchTypeoftheSFPModule
SFPModuleshavevariouslatchingmechanismstosecurethemintotheSFPCageofadevice.FiberPlex
ModulescansupportahostofmanufacturersandbrandsofSFPModulessotheusermayencounterany
numberofdifferentlatches.Someofthesearedescribedbelow.
BailClasp
ThebailclaspSFPmodulehasaclasp
thatyouusetoremoveorinstalltheSFP
module.
ActuatorButton
TheactuatorbuttonSFPmoduleincludesabuttonthatyou
pushinordertoremovetheSFPmodulefromaport.This
buttoncaneitherlift‘Up’orpress‘In’toreleasetheSFP
Moduledependingonthemanufacturer.
HandlingWarnings
SFPModulesarestaticsensitive.Topreventdamagefromelectrostaticdischarge(ESD),itis
recommendedtoattachanESDpreventativewriststraptoyourwristandtoabaremetalsurfacewhen
youinstallorremoveanSFPModule.
DisconnectallopticalorcoppercablesfromSFPModulespriortoinstallingorremovingtheSFPModule.
Failuretodosocouldresultindamagetothecable,cableconnectorortheSFPModuleitself.Removing
andinsertinganSFPModulecanshortenitsusefullife,soyoushouldnotremoveandinsertSFPModules
anymoreoftenthanisabsolutelynecessary.
ProtectopticalSFPmodulesbyinsertingcleandustcoversintothemafterthecablesareremoved.Be
suretocleantheopticsurfacesofthefibercablesbeforeyouplugthembackintotheopticalportsof
anotherSFPmodule.AvoidgettingdustandothercontaminantsintotheopticalportsofyourSFP
modules,becausetheopticswillnotworkcorrectlywhenobstructedwithdust.

MylarTab
TheMylartabSFPmodulehasatabthat
youpulltoremovethemodulefroma
port.
SlideTab
TheslidetabSFPmodulehasatabunderneaththefrontofthe
SFPmodulethatyouusetodisengagethemodulefromaport.
InsertingaModule
1) AttachanESD‐preventativewrist
oranklestrap,followingits
instructionsforuse.
2) Disconnectandremoveall
interfacecablesfromSFPModule.
3) IftheSFPModulehasaBailClasp,
closetheBailClaspbefore
insertingtheSFPModule.
4) Withthegoldfingerconnectoronthebottomandthelabelonthetop,lineuptheSFPModule
withtheemptycageandslideitinmakingsurethatitiscompletelyinsertedandseatedinthe
cage.
RemovingaModule
1) AttachanESD‐preventative
wristoranklestrap,
followingitsinstructionsfor
use.
2) Disconnectandremoveall
interfacecablesfromSFP
Module.
3) Releasethelatching
mechanism.
BailClasp–OpenthebailclaspontheSFPModulewithyourfingerinadownward
direction.
ActuatorButton–Gentlypresstheactuatorup(orin)whilepullingthebodyoftheSFP
ModuletoreleasetheSFPModulefromthecage.
MylarTab–Pullthetabgentlyinastraightoutward
motionuntilitdisengagesfromtheport.Makesurethe
tabisnottwistedwhenpullingasitmaybecome
disconnectedfromtheSFPModule.
SlideTab‐Withyourthumb,pushtheslidetabonthe
bottomfrontoftheSFPmoduleinthedirectionofthe
equipmenttodisengagethemodulefromthelinecard
port.IfyoupullontheSFPmodulewithoutdisengaging
thetab,youcandamagetheSFPmodule.
4) GrasptheSFPModulebetweenyourthumbandindexfingerand
carefullyremoveitfromtheport
5) PlacetheSFPModuleonanantistaticmat,orimmediatelyplaceitinastaticshieldingbagor
container

DIPSwitchSettings
CompatibilitywithMIL‐STDcircuits
ThedriversandreceiversforV.11signalsarecompatiblewiththeMIL‐STDbalancedspecificationsandthe
V.10interfaceissimilartoMIL‐STDunbalanced.MIL‐STD‐100signalsusethesamenegativeMARKcondition
asTIAcircuits,sothereisnoneedtoinverttheTDandRDsignals.MIL‐STD‐188‐114Aisset‐upforusercontrol
oftheMARKlevel,sotheneedfordatainversionattheFOMwillneedtobemadeonacase‐by‐casebasis.
IftheMIL‐STDinterfaceusesanyunbalancedsignals,suchasMIL‐STD‐188C(notethatthisstandardusesa
positiveMARK),thenprovisionswillneedtobemadetoexternallybiasonesideofthereceiversontheFOM
tousethemsingle‐ended.NotethattheMILstandardsareonlyanelectricalspecificationanddonotspecifya
pinoutorconnectortype,soacustomcablewillberequiredinmanycases.
Asynchronous,Isochronous,orSynchronousoperation
TheFOMistransparenttodataandclockingformats,sotherearenoswitchsettingsfordistinguishingthe
differentmodesofoperation.WhenapairofFOM‐1090unitsisusedasmodemlinkbetweentwoDTEs,allof
theinputsignalsaretransferredtothecrossed‐overcorrespondingoutputs(i.e.‐TTfromtheDTEisprovided
asRToutoftheFOM‐1090)attheoppositeend.WhentheFOMisusedinSendTimingapplications,certain
switchoptionsmaybeusedtoeliminateclockingissuesthatmayarise.Thoseoptionsareexplainedbelow.
SendDataRegenerationwhenusingSendTimingfromtheDCE
ThetypicalSendTimingset‐uphastheDCEsupplyingallclocks.TheSTsignalisgeneratedattheDCEandthen
carriedtotheremoteDTE.Inreturn,theremoteDTEthenclockstheSendDataoutofitselfontherisingedge
ofthesuppliedSTsignal.TheSendDataiscarriedbacktotheDCEwhereitisclockedin,samplingthedatabit
onthefallingedgeofthegeneratedSTclock.Alignmentproblemsariseduetopropagationdelaywhencertain
combinationsofdatarateandcabledistance(bothcopperandfiber)resultintheSendDatatransitions
occurringnearthefallingedgeoftheSTsignalattheDCE.
Asanexample,usingaroughnumberof4nsdelaypermeterofcable,25metersofcablewitha2.5mHzclock
willcausea180degreeshiftintheST‐SDrelationshipattheDCEinterface.(Thereisactually50metersof
propagationdelaysincetheclocktravels25metersinonedirectionandthedatatravels25metersinthe
other).ThisiswithouttakingintoaccountthedelaysofthelinedriversandreceiversintheDTE.
TheFOM‐1091regenerationoptionsmakeupforthisintwoways.ThefirstistocorrectforanySD‐ST
misalignmentduetopropagationdelayfromtheFOM‐1091totheDCEbydelayingtheSDsignaloutofthe
FOMbyonehalfofaSTclockcycle.ThesecondistheFOMhastheabilitytoretimetheincomingSDdata
internallywiththeincomingSTsignal,whichremovesanysamplingjitterfromtheSDsignalaswellas
correctingforpropagationdelays.
WhilethefallingedgeoftheSTsignalfromtheDCEisideallylocatedmid‐bitoftheSDsignalcomingintothe
DCE,itisnotnecessaryforittobemid‐bit.Infact,it’susuallynotmid‐bitduetodelays.Thisisoften
misunderstood.Theactualrequirementisthattheset‐uptimefortheregisterthattheSDsignalisbeing
loadedintobemetandthisisusuallyafractionoftheavailablebittime.Theonlytimethereisaproblemis
whenthefallingedgeoftheSTistooclosetotheSDtransitionsattheDCEinterfaceandthispreventstheset‐
uptimefrombeingmet.IftheSTfallingedgeisfarenoughawayfromtheSDtransitionedges(whenthenew
SDdatabithasmettheset‐uptime),theDCEwillstillclockthedatareliablyeventhoughitisn’tmid‐bit.Thisis
whymanySTtimingset‐upswillworkwithnoregenerationrequiredatall.Whentheedgesaretoocloseat
theDCEtheFOMwillneedtoretimethedataontheoppositeedgeoftheSTsignalbysettingswitch1.8to
ON.Thiswillallowthatwhenthepropagationdelaysaretakenintoaccounttheedgeshaveskewedenoughto
meettheset‐uptimeattheDCE.
Notethatininstallationswherethedataratemaybechangedorthecablelengthsmaychangeduetopatch
panelroutingofequipment,it’sentirelypossiblethatacombinationofswitchsettingsthatworksinone
scenariowillnotworkinanother.Theonlysolutiontothesesituationsistoinsertmoredelayinoneormore
oftheconfigurationsbyaddingtocablelengthuntilallofthescenarioswillworkwiththesameswitch
settings.
SettingtheswitchesforusingSTfromtheDCE
TakingintoaccountthevariablesofcablelengthfromtheDCEtotheFOM‐1091,fibercablelength,cable
lengthfromtheFOM‐1090totheDTE,plusdatarates,thereisnosingle‘correct’settingfortheSTinvertand
SDdataregenerationswitches.TocorrectlyconfigureasynchronouslinkusingSendTimingfromtheDCE,try
oneofthefollowing:
CorrectforpropagationdelaybetweenFOM‐1091andDCE
Determineiftheremovalofsamplingjitter(it’sactuallydutycycledistortion,notspeedfluctuation)fromthe
SDsignalisdesired.Ifitis,thenproceedtonextsectionbelow.Ifitisnotarequirement,startwithswitches
1.6,1.7,and1.8OFF.Ifthelinkfunctionsproperly,noregenerationconfigurationisneeded.Ifthelinkdoes
notoperateproperly,tryaccountingforpropagationdelaybetweentheFOM‐1091andtheDCEbysetting
switch1.8toON.Thelinkshouldnowoperatecorrectly.Ifitdoesnot,checkcablingfortheselectedinterface.
IfthelinkisrunningnearitsmaximumspeeditmaybenecessarytoremovethesamplingjitterfromtheSD
signalasdescribedinthenextsection.
RegenerateSendDatasignalandcorrectforpropagationdelaybetweenFOM‐1091andDCE
Ifremovalofsamplingjitterisdesired,setswitch1.6ONandswitches1.7and1.8OFF.ThiswillallowtheFOM
totrytoconfiguretheregenerationsettingsonits’own.Ifthelinkfunctionsproperly,nofurtherregeneration
configurationisneeded.Ifthelinkdoesnotoperateproperly,tryaccountingforpropagationdelaybetween
theFOM‐1091andtheDCEbysettingswitch1.8toON.
Iftheabovesettingdoesnotwork,youwillneedtosettheregenerationmanually.Setswitches1.6and1.8to
OFFandsetswitch1.7toON.Ifthelinkfunctionsproperly,nofurtherregenerationconfigurationisneeded.If
thelinkstilldoesnotoperateproperly,againtryaccountingforpropagationdelaybetweentheFOM‐1091and
theDCEbysettingswitch1.8toON.
Iftherearestillerrors,setswitch1.8OFFandswitch1.6toON.Iftherearestillerrors,onceagaintry
accountingforpropagationdelaybetweentheFOM‐1091andtheDCEbysettingswitch1.8toON.
OneoftheabovegroupsofswitchsettingsshouldallowaproperlyconfiguredSTlinktopassregenerateddata
totheDCE.
Theaboveissummarizedinthefollowingtable.Ifcalculatingdelays,keepinmindthattheFOMcardmay
introduceupto40nsofI/Ochipsetandmultiplexingdelayitself.

Switch1.6 Switch1.7 Switch1.8 Note
Off Off Off Noregeneration
On Off Off AutoRegeneration;datafromFOM‐1091transitions
onrisingedgeofSTfromDCE
On Off On AutoRegeneration;datafromFOM‐1091transitions
onfallingedgeofSTfromDCE
Off On Off ManualRegenerationusingrisingedgeofST;data
toDCEtransitionsonrisingedgeofSTfromDCE
Off On On ManualRegenerationusingrisingedgeofST;data
toDCEtransitionsonfallingedgeofSTfromDCE
On On Off ManualRegenerationusingfailingedgeofST;data
toDCEtransitionsonrisingedgeofSTfromDCE
On On On ManualRegenerationusingfallingedgeofST;data
toDCEtransitionsonfallingedgeofSTfromDCE
Off Off Off ThissettinghasnoeffectonFOM‐1091
SwitchDesignations
Asshownbelow,eachDIPswitchisassignedanumericaldesignationwhichiskeyedtothedescriptivetext;
Figure5FOM‐1090,FOM‐1091SwitchSettings
ConfiguringDIPSwitchParameters
(AlldefaultsettingsareOFFwithexceptionofinterfaceselection.)

Switch1
Switches1.1,1.2,and1.3:InterfaceConfiguration
(TherearpanelINTFledwillindicatethecurrentinterfacesetting.)
Interface Switch1.1 Switch1.2 Switch1.3 INTFLED
X.21 Off On On 1Flash
TIA‐232 On On Off 2Flashes
V.35 On Off Off 3Flashes
TIA‐449 On Off On 4Flashes
TIA‐530(422) Off On Off 5Flashes
Default(TIA‐530) Off Off Off
TIA‐530A Off Off On 6Flashes
Disabled On On On SolidRed
Switch1.4:NoFunction
Switch1.5:DataInvert
ChangestheMARKconditionforusewithMIL‐STDtypeinterfaces.TheidlestateforsomeMIL‐STDinterfacesisthe
oppositeofTIAandthissettingallowstheconversionfromthoseMILsignalstoTIAorbetweenoppositestateMIL
interfaceswhenthisswitchisON.
Off NegativeMARK
On PositiveMARK
Switch1.6:DataRegenerationA(FOM‐1091ONLY)
EnablesFOM‐1091autoormanualadjustmentforregenerationofTDsignaltoDCE
Off Normaloperation
On EnablesvariousmodesofTDoutsignalregenerationusingSTsignalfromDCEinconjunctionwith
switch1.7.
Switch1.7:DataRegenerationB(FOM‐1091ONLY)
EnablesFOM‐1091autoormanualadjustmentforregenerationofTDsignaltoDCE.
Off Normaloperation
On EnablesvariousmodesofTDoutsignalregenerationusingSTsignalfromDCEinconjunctionwith
switch1.6.
Switch1.8:InvertSendTimingOut(FOM‐1090only)
InvertsSTsignaloutofFOM‐1090.
Off Noinversion
On SToutisinverted
Switch1.8:DataRegenerationC(FOM‐1091only)
ChangesTDoutrelationshiptoSTinatFOM‐1091whenusingDataRegenerationSwitch.NofunctionifSwitch1.6and
Switch1.7areoff
Off TDouttransitionsonrisingedgeofSTin
On TDouttransitionsonfallingedgeofSTin

Switch2
Switch2.1:LoopRSandCSlocally
ThissettingcreatesaloopbackfortheRS\CSsignalsatthelocalend.Thecorrespondingsignalinputisstillcarried
acrossthelinktotheremoteinterface.Thesignalfromtheremoteendisignored.
Off NormalRSandCSsignaloperation
On OnFOM‐1090:LoopsRSinputtoCSoutput.CSsignalfromremoteendisignored.
OnFOM‐1091:LoopsCSinputtoRSoutput.RSsignalfromremoteendisignored.
Switch2.2:ForceRS/CSOn
ForcesthecorrespondingoutputONwhenunitisinopticalsync.Thisoverridesanysignalfromthefarendofthelink.
Off NormalRS/CSoperation
On ForcesRSoutON(FOM‐1091)orCSoutON(FOM‐1090)whenunitisinopticalsync.
Switch2.3:LoopTRandDMlocally
ThissettingcreatesaloopbackfortheTR/DMsignalsatthelocalend.Thecorrespondingsignalinputisstillcarried
acrossthelinktotheremoteinterface.Thesignalfromtheremoteendisignored.
Off NormalTRandDMsignaloperation
On OnFOM‐1090:LoopsTRinputtoDMoutput.DMsignalfromremoteendisignored.
OnFOM‐1091:LoopsDMinputtoTRoutput.TRsignalfromremoteendisignored.
Switch2.4:ForceTR/DMOn
ForcesthecorrespondingoutputONwhenunitisinopticalsync.Thisoverridesanysignalfromthefarendofthelink.
Off NormalTR/DMoperation
On ForcesTRoutON(FOM‐1091)orDMoutON(FOM‐1090)whenunitisinopticalsync.
Switch2.5:ForceRROn(FOM‐1090only;nofunctiononFOM‐1091)
ForcesRRoutONwhenunitisinopticalsync.ThisoverridesRRfromthefarendofthelink.
Off NormalRRoperation
On ForcesRRoutON(FOM‐1090)whenunitisinopticalsync.
Switch2.6:NoFunction
Switch2.7:NoLineTerminations
ThisswitchremovesalllineterminationsfromtheinterfaceallowingtheFOMtobeusedasamonitorpointonan
electricallink.Theunitcannotselectivelyremoveterminationsonactivelines;eitherallterminationsarepresentorall
areremoved.
Off Standardterminationsforselectedinterfacetypearepresent
On Terminationsremoved(Hi‐Zimpedance)
Switch2.8:LoopBackTest
LoopsopticTXtoopticRXandloopsallcoppersignalstotheircorrespondingsignal(TD‐RD,TT‐RT,RS‐CS,TR‐DM,RL‐
TM,RROn,ICOff,LLOff)
Off Normaloperation
On Loopbacktest

Switch3
Switch3.1:NoFunction
Switch3.2:NoFunction

Switch3.3:CryptotoCryptoNullModem(FOM‐1090only;nofunctiononFOM‐1091)
Thissetting,whenusedwithaFOM‐1090ateachend,reconfigurestheinterfacetoallowthefiberlinktoactasanull
modembetweentwocryptounits.TheFOM‐1090canbeconnecteddirectlytothecryptousingastandardstraight‐
through25pincableateachend,eliminatingtheneedforacustomcrossovercable.ThisconfigurationfunctionsinTIA‐
530,TIA‐530A,orTIA‐232modewithastraight‐throughcableorinTIA‐449modewithaDB‐25toDB‐37adaptercable.
Whenthisswitchisonitoverridesconfigurationswitches2.1‐2.5.
Off Normaloperation
On Cryptocrossovermode(nofunctiononFOM‐1091)
Switch3.4:NoFunction
Switch3.5:RemoteConfiguration
Off Allowremoteconfiguration
On Inhibitremoteconfiguration
Switch3.6:NoFunction
Switch3.7:NoFunction
Switch3.8:DisplayTest
Thissettingwillcausethefrontpaneldisplaytoflasheachoftheindicatorsyellowororange(withtheexceptionofthe
powerled,whichremainsgreen)forverificationpurposes.TherearOPTledwillalsoflash.Theunitcontinuesto
functionnormally‐onlythedisplayisaffected.
Off Normalindicatoroperation
On Allindictorsexceptpowerwillflash.TheOpticsledflashesoutofphasewiththeothers.
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