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Chapter 2: Network Requirements
Page 2-2 2H22-08R SmartSwitch 2208 User’s Guide
2.3 100BASE-TX NETWORK
The 2H22-08R, with an FE-100TX installed in ports 7 and 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 2H22-08R 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 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.
Single Mode Cable Loss
Test the single mode fiber optic cable with a fiber optic attenuation test set
adjusted for a 1300 nm wavelength. This test verifies that the signal loss is
within an acceptable level. The maximum loss for a single mode cable is
10.0 dB.
NOTE
The 2H22-08R 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 adjusts
its speed accordingly.