3Com 3C16700A - Manual (Page 16)

16
Port Status LED not lit for a 10BASE-T port that has a
connection. There is a problem with this connection.
Check that you are using a straight-through 10BASE-T cable
which is properly connected at both ends, and is not
damaged. If the cable is connected to port 4, ensure that
the Uplink/Normal switch is set to Normal (out). Also check
that the equipment being connected to the hub is powered
on and operating correctly. Refer to Figure 6 below to
compare the wiring of a straight-through and a crossover
cable.
Figure 6 Straight-through Cable/Crossover Cable
Pins 4, 5, 7 and 8 are not used
Straight-through Crossover
Pins 4, 5, 7 and 8 are not used
TxD+
TxD-
RxD+
RxD-
1
2
3
6
1
2
3
6
TxD+
TxD-
RxD+
RxD-
TxD+
TxD-
RxD+
RxD-
1
2
3
6
1
2
3
6
TxD+
TxD-
RxD+
RxD-
3C16700.book Page 16 Wednesday, July 7, 1999 5:46 PM