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PAGE 21
FireBall™ SEi User’s Manual
ETHERNET CONNECTIONS
The Ethernet jack on the back panel of the FireBall accepts any standard
twisted pair CAT5 Ethernet cable. If you are connecting FireBall to a home
network, you typically connect a standard Ethernet cable from your Ethernet
router or hub to the FireBall.
There are different grades, or categories, of twisted-pair cabling. Category 5
is the most reliable and widely compatible, and is highly recommended. It runs
easily with 10Mbps networks, and is required for 100Mbps networks. You can
buy Category 5 cabling that is pre-made, or you can cut & crimp your own.
Category 5 cables can be purchased or crimped as either straight-through or
crossed. A Category 5 cable has 8 thin, color-coded wires inside that run from
one end of the cable to the other. Only wires 1, 2, 3, and 6 are used by Ethernet
networks for communication. Although only four wires are used, if the cable
has 8 wires, all the wires have to be connected in both jacks.
Straight-through cables are used for connecting computers to a hub. Crossed
cables are used for connecting a hub to another hub (there is an exception:
some hubs have a built-in uplink port that is crossed internally, which allows
you to uplink hubs together with a straight cable instead).
In a straight-through cable, wires 1, 2, 3, and 6 at one end of the cable are also
wires 1, 2, 3, and 6 at the other end. In a crossed cable, the order of the wires
change from one end to the other: wire 1 becomes 3, and 2 becomes 6.
To figure out which wire is wire number 1, hold the cable so that the end of the
plastic RJ-45 tip (the part that goes into a wall jack first) is facing away from
you. Flip the clip so that the copper side faces up (the springy clip will now be
parallel to the floor). When looking down on the coppers, wire 1 will be on the
far left.