IEC 62077:2001 pdf download
IEC 62077:2001 pdf download.Fibre optic circulators – Generic specification.
However, the detail specification writer shall not remove tests nor alter the sequence of an environmental category standard.
When a detail specification writer adds tests to a specified category, the environmental category shall be given a plus (+) designation.
EXAM PLE:
— environmental category ii +
— environmental category v +
The blank detail specification for environmental category 99 is available for use where the category standards are not suitable.
2.1.5 Assessment level
Assessment level defines the inspection levels and the acceptable quality level (AOL). of groups A and B and the periodicity of inspection of groups C and 0. Detail specifications shall specify one or more assessment levels, each of which shall be designated by a capital letter.
The following are preferred levels:
• Assessment level A:
— group A inspection: inspection level II, AOL = 4 %
— group B inspection: inspection level II, AQL = 4 %
— group C inspection: 24-month periods
— group D inspection: 48-month periods
• Assessment level B:
— group A Inspection: inspection level II, AOL = 1 %
— group B inspection: inspection level II, AOL — 1 %
— group C inspection: 18-month periods
— group D inspection: 36-month periods
• Assessment level C:
— group A inspection: inspection level II, AOL • 0,4 %
— group B inspection: inspection level II, AOL — 0,4 %
— group C inspection: 12-month periods
— group D inspection: 24-month periods
One additional assessment level may be added in the detail specification. When this is done. the capital letter X shall be used.
2.1.6 Normative reference extensions
Normative reference extensions are used to identify integrated independent standards specifications or other reference documents as blank detail specifications.
Unless otherwise specified, additional requirements of extensions are mandatory. Usage is primarily intended to merge associated components to form hybrid devices, or integrated functional application requirements that are dependent on technical expertise other than fibre optics.
Published reference documents produced by ITU consistent with the scope statements of the relevant IEC specification series may be used as an extension. Published documents produced by other regional standardization bodies such as TIA, ETSI. JIS, etc. may be referenced in a bibliography attached to the generic specification.
Some optical fibre circulator configurations require special qualification provisions which shall not be imposed universally. This accommodates individual component design configurations, specialized field tooling or specific application processes. In this case, the requirements are necessary to assure repeatable performance or adequate safety, and provide additional guidance for complete product specification. These extensions are mandatory whenever used to prepare, assemble or install an optical fibre circulator, either for field application usage or preparation of qualification test specimens. The relevant specification shall clarify all stipulations. However, design and style dependent extensions shall not be imposed universally.
In the event of conflicting requirements, precedence shall be given, in descending order, as follows: generic over mandatory extension, over blank detail, over detail, over application specific extension.
Examples of optical connector extensions are given as follows:
• using IEC 61754-4 and IEC 61754-2 to partially define a future IEC 60874 specification for a duplex type SC/BFOC/2,5” hybrid connector adapter;
• using IEC 61754-13 and lEG 60869-1-1 to partially define a future lEG 60874 specification for an integrated type FC” preset attenuated optical connector.
• using lEG 61754-2 and lEG 61073-4 to partially define a future lEG 60974 specification for a duplex “BFOC/2,5 receptacle incorporating integral mechanical splices.
Other examples of requirements to normative extensions:
— some commercial or residential building applications may require direct reference to specific safety codes and regulations or incorporate other specific material flammability or toxicity requirements for specialized locations;
— specialized field tooling may require an extension to implement specific ocular safety, electrical shock. burn hazard avoidance requirements, or require isolation procedures to prevent potential ignition of combustible gases.
2.2 Documentation
2.2.1 Symbols
Graphical and letter symbols shall, whenever possible, be taken from IEC 60027, lEG 60617 and IEC 61930.
