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The horizontal optical fiber cabling link segments need to be tested at only one (1) wavelength. Because of the short length of cabling (90 m [295 ft] or less), attenuation deltas due to wavelength are insignificant. The horizontal link should be tested at 850 nm or 1300 nm in one direction in accordance with ANSI/EIA/TIA-526-14-A, Method B, One Reference Jumper. The attenuation test results shall be less than 2.0 dB. This value is based on the loss of two (2) connector pairs, one (1) pair at the telecommunications outlet/connector and one (1) pair at the horizontal cross-connect, plus 90 m (295 ft) of optical fiber cable.

For open office cabling implemented with a consolidation point, the attenuation test results shall be less than 2.75 dB when testing between the horizontal cross-connect and the telecommunications outlet/connector. For open office cabling implemented with the multi-user telecommunications outlet assembly, the attenuation test results shall be less than 2.0 dB. 

 
Horizontal link measurement ::

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