3Com 3CB9LF20R Installation Guide - Page 10

lengths beyond 70 km. Consult your fiber installer to obtain actual link

Page 10 highlights

10 70-km Gigabit Ethernet GBIC Transceiver Installation Guide The budget figures for all three of the sample systems reflect conservative values for fiber attenuation and connector attenuation to assure operation at 70 km under typical to less-than-ideal conditions. Link distances of greater than 70 km can be attained when conditions allow. Fiber attenuation of 0.19 dB per km and lower is possible, allowing link lengths beyond 70 km. Consult your fiber installer to obtain actual link attenuation values at 1550 nm for the fiber intended for use with the 70-km GBIC transceiver.

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10
70-km Gigabit Ethernet GBIC Transceiver Installation Guide
The budget figures for all three of the sample systems reflect conservative
values for fiber attenuation and connector attenuation to assure
operation at 70 km under typical to less-than-ideal conditions. Link
distances of greater than 70 km can be attained when conditions allow.
Fiber attenuation of 0.19 dB per km and lower is possible, allowing link
lengths beyond 70 km. Consult your fiber installer to obtain actual link
attenuation values at 1550 nm for the fiber intended for use with the
70-km GBIC transceiver.