Dell Studio 1558 (Early 2010) - Manual (Page 319)

Ports
319
Ethernet Port
An ethernet port uses twisted pair conductors for networking and faster
Internet connection.
Cable plugged into this port can lead either to a network hub (a junction box
that can wire lots of network cables together), directly to a cable modem, or a
DSL modem or to an Internet gateway which shares a fast Internet
connection between computers.
Data moves through these at speeds of either 10 Mbps, 100 Mbps, or 1000
Mbps depending on the speed supported by the network card in the
computer. When in use, lights on these devices flicker.
The ACT light flickers when data moves through the network to or from the
port. The 10 or 100 light denote data speed. 10 denotes data moving across
the network at 10 Megabits per second while 100 denotes data moving at 100
Megbits per second.
Pin Ethernet 10/100 Base -
T Signal Pin Gigabit Ethernet
Signal
1 Transmit + 1 Transmit/Receive 0 +
2 Transmit 2 Transmit/Receive 0 –
3 Receive + 3 Transmit/Receive 1 +
4 NU 4 Transmit/Receive 2 +
5 NU 5 Transmit/Receive 2 –
6 Receive – 6 Transmit/Receive 1 –
7 NU 7 Transmit/Receive 3 +
8 NU 8 Transmit/Receive 3 –