Appendix A: Cabling and Pin Assignment
A-1 RJ-45
There are different grades, or categories, of twisted-pair cabling. Category 5
is the most reliable and is highly recommended. Category 3 is a good second
choice.
Straight-through
cables are used for connecting computers’ NIC
cards to a hub.
Crossover
cables
are used for connecting a hub to another
hub. (The router provides a built-in uplink/normal switch. Uplink mode is
crossed internally, which allows you to link or connect hubs together with a
straight-through cable instead.)
A-1-1
RJ-45 pin assignment
There are 8 thin, color-coded wires inside, run from one end of the cable
to the other. All 8 wires are used.
Table 0-1
RJ-45 Color Chart
Wire 1
White with an Orange
stripe
Wire 2
Orange
Wire 3
White with a Green Stripe
Wire 4
Blue
Wire 5
White with a Blue Stripe
Wire 6
Green
Wire 7
White with a Brown Stripe
Wire 8
Brown
Pin 1
*Note*
To determine 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. Face the clip down so that the copper side faces up
(the springy clip will now be facing the floor), when looking down on the
copper side, wire 1 is on the far left.
Connection between NIC card and Hub
17
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