3Com 3C16792A User Guide - Page 17
Port Status LED Switch 4 Link/Activity LED Switch 8
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UPC - 662705489469
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Port Status LED (Switch 4) Link/Activity LED (Switch 8 or Switch 16) not lit for a port that has a connection. Check that you are using a 'straight-through' cable which is properly connected at both ends, and is not damaged. Refer to "Twisted Pair (TP) Cables" on page 11. Also check that the equipment connected to the Switch is powered on, operating correctly and contains the correct type of connection. Refer to Figure 5 below to compare the wiring of a straight-through and a crossover cable. Figure 5 Straight-through Cable/Crossover Cable Normal port Pin 1 Rx+ 2 Rx- 3 Tx+ 4 5 6 Tx- 7 8 Uplink Normal Pin port port Pin 1 1 Rx- Rx+ 2 2 Rx+ Rx- 3 3 Tx- Tx+ 4 4 5 5 6 6 Tx+ Tx- 7 7 8 8 Normal Pin port 1 Rx+ 2 Rx- 3 Tx+ 4 5 6 Tx- 7 8 17
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17
Port Status LED (Switch 4) Link/Activity LED (Switch 8
or Switch 16) not lit for a port that has a connection.
Check that you are using a ‘straight-through’ cable which is
properly connected at both ends, and is not damaged. Refer
to “Twisted Pair (TP) Cables” on page 11. Also check that
the equipment connected to the Switch is powered on,
operating correctly and contains the correct type of
connection. Refer to Figure 5 below to compare the wiring
of a straight-through and a crossover cable.
Figure 5
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