ITU L.70:2007
ITU L.70:2007 Active Electronics In The Outside Plant Describes mechanical and environmental protection as well as electrical powering and cooling. It also pays attention to maintenance, security and environmental aspects.
Table of Contents
1Scope2References
3Definitions
3.1Termsdefinedelsewhere
3.2TermsdefinedinthisRecommendation
4Abbreviationsandacronyms
5Packagingforenvironmentalandmechanicalprotection
5.1Environments
5.2Sealingagainstingressofsolidsandfluids
5.3Resistancetoaggressiveagents
5.4Mechanicalprotection
6Thermalmanagement
6.1Thermalmodel
6.2Operationaltemperaturerangeoftheelectronics
6.3Enclosuredesign
7Electricalpowering
7.1Connectiontothepowergrid
7.2Remotelinepowering
7.3Backuppower
8Maintenanceaspects
9Safetyandenvironmentalaspects
9.1Electricalsafety
9.2Vandalismandaccidentaldamage
9.3Externaltemperature
9.4Acousticalnoise
9.5Physicalobstructionandvisualintegrationinthe
environment
9.6Electromagneticcompatibility
AnnexA-Environmentalclassification
A.1Basicoutdoorenvironmentalclasses
A.2Specialconditions
AppendixI-Thermaldesignofabovegroundenclosures
I.1Singlewall,naturalconvection
I.2Venteddualwall,naturalconvection
I.3Forcedconvection
I.4Air-to-airheatexchangers
I.5Naturalandforcedventilation
I.6Activecooling("chillers")
I.7Heaters
AppendixII-Thermalpropertiesofundergroundenclosures
II.1Freeorforcedconvectioninside
II.2Heatexchanger
AppendixIII-Exampleofperformancespecificationforactive
streetcabinets(groundlevelandaboveground,
OGandOA)
III.1Evaluationcriteria
III.2Testprogram
AppendixIV-Exampleofperformancespecificationfor
undergroundlevel(OS)
IV.1Evaluationcriteria
IV.2Testprogram
Bibliography