Escient FireBall SE-80, Руководство для стартапов

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FireBall SE Advanced Users Guide WD049-1-1
9/23/2005
Page 7 of 46
6640 Intech Blvd. Suite 250 Indianapolis, IN 46278 317.616.6789 phone 317.616.6790 fax www.escient.com
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.
CAT5 cabling should not exceed 100 meters. The following drawing depicts the typical wiring
scheme for CAT5. For more information about wiring an Ethernet network, please refer to the
Linksys web site.