Standards Activities - FIA · - ISO/IEC 11801 (or BS EN 50173-2); - ISO/IEC 24702 (or BS EN 50173-3); - ISO/IEC 24764 (or BS EN 50173-5); a launch condition to be used when undertaking
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Information technology - Implementation and operation of customer premisescabling - Testing of optical fibre cabling
OBJECTIVES
a single method of testing which could be applied to both adapter-to-adapter and toplug-to-plug configurations of generic cabling in accordance with the followingstandards:- ISO/IEC 11801 (or BS EN 50173-2);- ISO/IEC 24702 (or BS EN 50173-3);- ISO/IEC 24764 (or BS EN 50173-5);
a launch condition to be used when undertaking the testing of multimode opticalfibre cabling;
the appropriate use of reference grade connectors on test cords to reducemeasurement spread - together with an associated amendment of test limits.
The Manor House, BUNTINGFORD, Hertfordshire, SG9 9AB, United Kingdom Tel: +44 (0)1763 273039 Fax: +44 (0)1763 273255
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FIAin association with
Why Not ISO/IEC 14763-3?Testing - The Final Solution
The FIA does not support the directapplication of ISO/IEC 14763-3 for
the following reasons:
the work of the FIA Project Team investigating the specification andprocurement of reference grade terminations found that there was nostraightforward method by which test cords with reference grade terminationscould be purchased that could be universally applied to all connector styles(this is documented in FIA-TSD-2000-4-2-3);NOTE: for example, SC connectors had few problems but LC connectors did not lendthemselves to the same approach
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2if reference grade terminations are not universally available it is not practical,or even possible, to apply a standard that universally requires their use
3different connection combinations produce different limitsi.e RGT-RGT, RGT-normal, normal-normal
The Manor House, BUNTINGFORD, Hertfordshire, SG9 9AB, United Kingdom Tel: +44 (0)1763 273039 Fax: +44 (0)1763 273255
2012
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FIAin association with
Why Not ISO/IEC 14763-3?Testing - The Final Solution
It is not in the interest of the FIA to encourage installers or their customers to actin a way that risks the reputation of the FIA or the installer
and it is certainly not in the interests of the FIA to encourage practices that couldresult in financial penalty for any of those involved.
there is a clear and present risk for installers that tightened limits that assumethe use of reference grade terminations on the test cords will be breached if,for whatever the reason, the performance of the test cord terminations fails tomeet the specified values for reference grade terminations
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although a single test method is very attractive, its use on typical “adapter-to-adapter” cabling configurations results in a clear and present risk of obtaining“negative” attenuation results, the probability of which is increased for veryshort links in which there is little or no cable attenuation2
while these “negative” values are entirely predictable, they are difficult tojustify to customers
MOST FIA MEMBERS ARE INVOLVED IN INSTALLATION OF CABLING WHERETHE CABLE ATTENUATION IS LOW