Table of Contents
1Introduction
2Parametersrelatedtoreliabilityandavailability
offibreopticsystems
2.1Fibreopticsystemavailabilityandmaintenance
reliability-relatedparameters
2.2Activeopticaldevicereliabilityparameters
2.3Passiveopticaldevicereliabilityparameters
2.4Opticalfibreandcablereliabilityparameters
3Definitions
4Steady-statereliabilitypredictionmethodofdevices,units
andfibreopticsystemsinserialconfiguration
4.1Purposeandscope
4.2Applicationsofthepredictedfailureratemethod
4.2.1Equipmentmanufacturers/suppliers
4.2.2Equipmentownersandnetworkoperators
4.3Guidelines
4.3.1Definitionoffailure
4.3.2Operatingconditions
4.3.3Environmentaldescription
4.3.4Adjustingtheestimatesgivenbythismethod
4.4Steady-statefailureratepredictionmethod
4.4.1Applicabilityofthemethod
4.4.2Devicesteady-statefailurerate
4.4.3Unitsteady-statefailurerate
4.4.4Linesystemsteady-statefailurerate
5Calculationmethodologiesforfibreopticsystemdevices,
unitsandsystemsinserialconfigurationregarding
reliabilityandmaintenanceparameters
5.1Plug-incircuitpackMTBF
5.2SystemMTBF(terminalandrepeater)
5.3Frequencyofscheduledmaintenanceactions
5.4Randomfailurerate
5.5Infantmortalityfactor
6Calculationmethodologyofavailabilityandmaintenance
parametersoffibreopticsystemswithlineprotection
6.1Generalconsiderations-Lineprotectionandnetwork
protection
6.2State-spacemethodologytodetermineavailabilityand
maintenanceparametersinfibreopticsystemswith
lineprotection
6.2.1Step1-Inputs
6.2.2Step2-Fromtheaboveinputsdetermine
6.2.3Step3-Calculatingsystemreliability-
relatedmeasures
6.3Optionsoffibresystemswithlineprotection
6.3.1One-for-one(1+1)linkprotection
6.3.2One-for-N(N+1)linkprotection
6.3.3Rings
7Referencecircuitsforend-to-endchannelavailability
oflinesystemsonopticalfibres
8Allocationmethodology
8.1Contributorstounavailability-Considerations
regardingSDHandPDHsystemsonopticalfibres
8.2Allocationmethodology
AppendixIDeterminationofunitsteady-statefailurerate-
Example
I.1Unitdescription(example)
I.2Reliabilityparametersofdevices(example)
I.3Unitsteady-statefailurerate(FITs)
AppendixIIStudycasechannelavailabilityfora4x140
Mbit/srepeaterlinkonopticalfibreswith
"3+1"lineprotection
II.1Description
II.2Results-Unavailability(minutes/year)per140
Mbit/schannel
AppendixIIIStudycase-Channelavailabilityforapoint-
to-pointfibreconnectioninthelocalnetwork
with"1+1"lineprotection,withandwithout
cablepathredundancy
III.1Description
III.1.1Natureoftheproblem
III.1.2Typeofconnections
III.2Results
Abstract
Gives details of the parameters required for characterization and methods for prediction and calculation of the fibre optic system reliability, including reliability of the devices and availability of channels transmitted through the systems. Emphasises single-mode fibre systems.
