3Com 3C16700A - Manual (Page 23)

23
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 8, 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 9 below to
compare the wiring of a straight-through and a crossover
cable.
Figure 9 Straight-through Cable/Crossover Cable
1
Normal
port Pin Pin
Uplink
port
Rx+
Rx-
Tx+
Tx-
Rx-
Rx+
Tx-
Tx+
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
Normal
port Pin Pin
Normal
port
Rx+
Rx-
Tx+
Tx-
Rx+
Rx-
Tx+
Tx-
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
3C16700.book Page 23 Wednesday, July 7, 1999 5:46 PM