User's Manual

Update: About Your
Build-To-Order Macintosh
Congratulations on purchasing your Macintosh computer. Since you chose the components of
your computer, parts of it may differ from what’s described in the manual that came with it.
This update addresses the differences and also includes information on additional components
not covered in the manual.
10/100Base-T Network Connection
If your computer came with the 10/100Base-T Ethernet option, a 10/100Base-T Ethernet card
is installed in one of your computer’s PCI slots. You can connect a cable for a 10Base-T or a
100Base-T Ethernet network to this card.
Note: The type of twisted-pair cable you use depends on whether you connect to 10Base-T or
100Base-T Ethernet. Category 5 twisted-pair cable must be used to connect to 100Base-T
if you want to get the maximum speed from this connection.
Checking the Status of a 10/100Base-T Network Connection
If you connect your computer to a network using the 10/100Base-T Ethernet card, you can
check the card’s LED indicators to monitor network activity. There are four indicators:
m ACT (Activity): Blinks when the 10/100Base-T Ethernet card is active
m COL (Collision): Glows when a network collision has occurred (a temporary condition that
occurs when two computers on a network try to send data simultaneously)
m LNK (Link): Glows when a reliable 10 megabit (Mbit) or 100 Mbit network connection has
been established
m 100 Mb: Glows when a reliable 100 Mbit link is established
10/100Base-T Ethernet port (RJ-45)
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