this contamination. 2.5.3 Attenuation Uniformity The attenuation of a continuous fiber is expected to be distributed uni- formly throughout its length SO that there is no discontinuity in excess of 0.1 dB. Splices made in manufacturing are typically at least 1 km apart; these splices must meet the attenuation requirements as part of the fiber. This implies that bonded or fused splicing with accurate concentricity is necessary to produce splice losses on the order of 0.05 dB or less. 2.5.4 Attenuation with Bending For multimode fibers, the attenuation introduced when 100 turns are wound on a 75-mm diameter mandrel (including the substance's own attenuation of 23.6 meters of fiber) is expected not to exceed 0.5 dB at any usable wavelength. For single-mode fibers, the attenuation of these 100 turns is expected not to exceed 1 dB at 1.55 um. Depressed-cladding fiber is more resistant to these losses due to a smaller MFD (better optical-power containment). Because these losses increase as wavelength increases, the depressed-cladding design is better suited for operations at longer wave- lengths such as 1.55 um. Chapter 2 2.5.5 Chromatic Dispersion (Single-Mode Fiber) For conventional single-mode fibers, the zero-dispersion wavelength, 10, typically is between 1.298 and 1.322 um, with a nominal value of 1.31 um. The maximum value of the dispersion slope at 10, Smax, is typically less than 0.095 ps/(kmXnm2). For dispersion-shifted single-mode fibers, the zero-dispersion wavelength is between 1.54 and 1.56 um, with a nominal value of 1.55 um. In addition, Somax is typically no greater than 0.07 ps/(kmXnm2). 2.5.6 Multimode Bandwidth The minimum bandwidth is to be specified at the wavelength of intended use either by the end-to-end bandwidth requirement of the cable span or by an individual-reel bandwidth requirement. Typical minimum bandwidth categories for the three multimode fiber designs were given in Table 2-4. 2.5.7 Cutoff Wavelength (Single-Mode Fiber) The cutoff wavelength of a cabled fiber, Acc, should be between