Chapter 3: InstallationPage 3-82H22-08R SmartSwitch 2208 User’s Guide3.6.1 Connecting a Twisted Pair Segment to theFE-100TXAn FE-100TX installed in port slot 7 and/or 8 has an internal crossoverswitch. When connecting a workstation, use a straight-through cable andset the Fast Ethernet Interface Module crossover switch shown inFigure 3-6 to the straight-through position marked with =. To connectnetworking devices, such as another switch, repeater, or router, use acrossover cable or flip the crossover switch to the crossed over positionmarked with an X as shown in Figure 3-6.Figure 3-6 FE-100TX Crossover SwitchA schematic of a crossover cable is shown in Figure 3-7. If the wires donot cross over, use the switch on the FE-100TX to internally cross overthe RJ45 port.Figure 3-7 Cable Pinouts - RJ45 Crossover CableNOTETo ensure proper operation, use only Category 5 UnshieldedTwisted Pair (UTP) cabling that has an impedance of 85 to111 ohms.Position X(crossed over)1. RX+2. RX-3. TX+4. NC5. NC6. TX-7. NC8. NCPosition =(not crossed over)1. TX+2. TX-3. RX+4. NC5. NC6. RX-7. NC8. NCFE-100TX1016651_05100=xTX+TX–RX+RX– 213610BASE-T Device PortTX+TX–2136RJ45 Port2251-31RJ45 to RJ45RX+RX–
