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Chapter 2: Network Requirements
2-2 6H122-08 User’s Guide
2.3 100BASE-TX NETWORK
The six fixed ports of the 6H122-08, and an FE-100TX installed in ports 7
or 8, provide an RJ45 connection that supports Category 5 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 6H122-08 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 6H122-08 is capable of operating at either 10 or 100 Mbps.
The 6H122-08 can automatically sense the speed of the other
device and adjusts its speed accordingly.