3Com Gigabit Switch 8 User Manual

Also see for 3C16704A - OfficeConnect TP4 Hub: User guide Manual

23Port Status LED not lit for a 10BASE-T port that has aconnection. There is a problem with this connection.Check that you are using a straight-through 10BASE-T cablewhich is properly connected at both ends, and is notdamaged. If the cable is connected to port 8, ensure thatthe Uplink/Normal switch is set to Normal (out). Also checkthat the equipment being connected to the hub is poweredon and operating correctly. Refer to Figure 9 below tocompare the wiring of a straight-through and a crossovercable.Figure 9 Straight-through Cable/Crossover Cable1Normalport Pin Pin UplinkportRx+Rx-Tx+Tx-Rx-Rx+Tx-Tx+2345678123456781Normalport Pin Pin NormalportRx+Rx-Tx+Tx-Rx+Rx-Tx+Tx-2345678123456783C16700.book Page 23 Tuesday, July 13, 1999 9:59 AM