Chapter 2: Network Requirements
2.2100BASE-FX FIBER OPTIC NETWORK
The 2H28-08R has six SC fiber optic ports designed for use with multimode fiber. Use of incorrect cabling may cause network problems.
Ports 1 through 6 of the 2H28-08R support the multimode 100BASE-FX interface. Ports 7 and 8 of the 2H28-08R support the Cabletron Systems FE-100FX and FE-100F3 fiber optic interface modules. The FE-100FX is designed for use with multimode fiber optic cable, while the FE-100F3 is designed for use with single mode fiber optic cable.
The device at the other end of the fiber optic segment must meet the 100BASE-FX Fast Ethernet network requirements to operate at 100 Mbps.
Multimode Fiber Optic Cable Length
The multimode fiber optic cable specifications for a 100BASE-FX segment is covered in the Cabletron Systems Cabling Guide.
Single Mode Fiber Cable Lengths
With the installation of an optional FE-100F3, single mode fiber optic cable may be used to make a connection to a similar device at the other end of the fiber. The maximum single mode fiber optic length of a 100BASE-FX segment may be no more than 5 km between Data Terminal Equipment (DTE to DTE) in half duplex mode or 20 km (DTE to DTE) in full duplex mode. Refer to Appendix B for more information on single mode fiber cable.
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