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Appendix E:Twisted-Pair
Cabling
There are different grades, or “categories,” of twisted-pair cabling. Category 5
is the most reliable and most highly recommended. Category 3 is a good sec-
ond choice. Straight-through cables are used for connecting computers to a
hub. Crossover 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; this
allows you to link or connect hubs together with a straight-through cable
instead).
You can buy pre-made Category 5
cables, or cut and crimp your own.
Category 5 cables can be purchased or
crimped as either straight-through or
crossover. Inside a Category 5 cable
are eight thin, color-coded wires inside
that run from one end of the cable to
the other. All eight wires are used. 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 crossover cable, the order of the
wires change from one end to the
other: wire 1 becomes 3, and 2
becomes 6. See Figures E-3 and E-4 on
the next page for more
detailed information on
straight-through and
crossover cabling.
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 parallel to the floor). When looking down on
the copper side, wire 1 will be on the far left.
Figure E-1
Figure E-2
6. Find and double-click TCP/IP in the list to the right (see Figure D-2).
7. After a few seconds, the main Network window will appear. The TCP/IP
Protocol should now be listed.
8. Click the OK button. Windows may ask for original Windows installation
files. Supply them as needed, e.g., c:\windows\options\cabs, D:\win98,
D:\win95.
9. Windows will ask you to restart the PC. Click the Ye s button.
The TCP/IP Installation is now complete.
Figure D-2
Figure D-3