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Chapter 2: Network Requirements
2-2 6H128-08 and 6H129-08 User’s Guide
2.3 100BASE-TX NETWORK
The 6H12X-08, with an FE-100TX installed in ports 7 or 8, provides an
RJ45 connection that supports UTP cabling with an impedance between
85 and 111 ohms. The device at the other end of the twisted pair segment
must meet IEEE 802.3u 100BASE-TX Fast Ethernet network
requirements for the devices to operate at 100 Mbps. Refer to the
Cabletron Systems Cabling Guide for details.
2.4 100BASE-FX FIBER OPTIC NETWORK
Ports 7 and 8 of the 6H12X-08 support the Cabletron Systems FE-100FX
and FE-100F3 fiber optic interface modules. 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. Refer to the Cabletron
Systems Cabling Guide for details.
Multimode Mode Fiber Optic Cable Length
The maximum multimode fiber optic cable length of a 100BASE-FX
segment is covered in the Cabletron Systems Cabling Guide.
Single Mode Fiber Cable Lengths
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.
NOTE
The 6H12X-08 with an FE-100TX installed is capable of
operating at either 10 or 100 Mbps. The FE-100TX can
automatically sense the speed of the other device and adjust
its speed accordingly. For details, see Appendix B. If operating
at 100 Mbps, the cable must be Category 5 compliant with an
impedance of 85 to 111 ohms.
NOTE
The 6H128-08 has six fixed SC fiber optic ports designed for
use with multimode fiber. The 6H129-08 also has six fixed SC
fiber optic ports, but it is designed for use with single mode
fiber optic cabling. Use of the wrong cabling can cause network
problems.