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Technical Specifications
10-30
Issue 3 June 2000
Table 10-14. OC-3 OLIU Link Budget - Multimode Operation
§
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. 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 value loss (0.4 dB/km) and splice loss (0.2 dB per splice, 11
total splices) associated with single-mode fiber.
** Unallocated margin, or safety margin, is typically specified from 0 dB to 3dB.
Maximum Span Length (km)
Fiber Bandwidth 28G-U/28G2-U
1000 MHz-km
800 MHz-km
500 MHz-km
300 MHz-km
6.5
5.1
3.1
1.8
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