363-206-285
Technical Specifications
10-36 Issue 3 June 2001
Notes (Continued):
§ One connector (0.75 dB) on each end is assumed to connect station cable to outside
plant.
¶ Unallocated margin, or safety margin, is typically specified from 0 dB to 3 dB.
∗∗ The 24G-U/24H-U requires an external lightguide buildout as part of the connector
assembly for loopbacks and for loss budgets less than 10 dB.
††Budget available for both station and transmission cable and splices.
‡‡ Attenuation can be the limiting factors in span length. A rough rule of thumb for
attenuation-limited systems operating in the 1310 nm wavelength range 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 in the 1310 nm range.
For the 24G-U, the maximum distance is not dispersion limited because single
longitudinal mode laser is used. Given the attenuation assumption, the maximum span
length for the 24G-U is 51 km.
Attenuation can be the limiting factors in span length. A rough rule of thumb for
attenuation-limited systems operating in the 1550 nm wavelength range is 0.25 dB/km,
including cable and splice loss.
For the 24H-U, the maximum distance is not dispersion limited because single
longitudinal mode laser is used. Given the attenuation assumption, the maximum span
length for the 24H-U is 96 km.
Maximum span length can be calculated more precisely based on particular fiber and
splice characteristics and local engineering rules.
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