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Technical Specifications
10-32 Issue 3 June 2001
§§ Attenuation and dispersion can be the limiting factors in span length. For OC-3 single-
mode fiber systems, dispersion is not a factor and all applications are attenuation
limited. For OC-12 systems, the maximum distance could be either attenuation limited
or dispersion limited. The limits must be calculated based on both factors and the lesser
of the two defines the actual maximum span length. A rough rule of thumb for
attenuation-limited systems is 0.45 dB/km. This estimate includes typical cable loss
(0.4 dB/km) and splice loss (0.2 dB per splice, 11 total splices) associated with single-
mode fiber.
Maximum span length can be calculated more precisely based on particular fiber and
splice characteristics and local engineering rules.
¶¶ 1.0 nm for a SLM laser.
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