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2 - 14 ONline Ethernet 10BASE-FB Module Installation and Operation Guide
3. Use Table 2-7 to determine the worst case loss for the 50/125 fiber
cable (2000 meters x 5 dB = 10.0 dB). Add the dB losses to
determine total path loss. The total path loss is 11.5 dB.
The 11.5 dB optical loss exceeds the optical power budget of 5.5 dB.
Therefore the link will not work and the 10BASE-FB Module Port
Status LED will signal a Low Light condition.
Thus, you must use High Power mode. When you use High power
(see Table 2-4), the optical power budget of 13.5 dB is sufficient to
handle the 11.5 dB path loss.
Choosing a Network Backbone Cabling Structure
Because of fiber's long-distance capabilities and immunity to noise, 3Com
strongly recommends using fiber as the backbone. You can choose
between two fundamental configuration topologies when connecting your
network backbone using 10BASE-FB Modules in an ONline System
Concentrator:
❑ Star Configuration
❑ Serial Configuration