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| The performance parameters necessary for performance testing, when installing components compliant with ANSI/TIA/EIA-568-B.1 and ANSI/TIA/EIA-568-B.3 is link attenuation. Bandwidth (multimode) and dispersion (singlemode) are important performance parameters, but because they can not be adversely affected by installation practices, they should be tested by the fiber manufacturer and do not require testing in the field.

The acceptable link attenuation for a recognized horizontal optical fiber cabling system is based on the maximum 90 m (295 ft) distance. The link attenuation equation is provided to determine "acceptable link performance" for multimode and singlemode backbone cabling systems. This equation calculates link attenuation for backbone link segments based upon fiber type, cable type, wavelength, link distance and number of splices.

Link attenuation has been based on the connectivity requirements of ANSI/TIA/EIA-568-B.1 and ANSI/TIA/EIA-568-B.3 and specify the use of the one reference jumper method specified by ANSI/TIA/EIA-526-14-A, Method B and ANSI/TIA/EIA-526-7, Method A.1. The user should follow the procedures established by these standards to accurately conduct performance testing.

Link attenuation does not include any active devices or passive devices other than cable, connectors, and splices (i.e., link attenuation does not include such devices as optical bypass switches, couplers, repeaters or optical amplifiers).

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