B-2
Ethernet Specifications
A few tips
For 10BaseT cabling
•
The wiring normally specified for 10BaseT is 26 to 22
AWG, which corresponds to the wire gauge of telephone
unshielded twisted-pair cables. You need two pairs of wir-
ing for each node.
•
When wiring 10BaseT connections, take precautions
against splitting pairs. Be sure you maintain the same color
mates for each pair used within the cable. If you don’t fol-
low a common color pairing, you can mix up the wires pre-
venting the Ethernet signal from being transmitted.
•
Be sure to check the cabling you plan to use. Older cabling
may not be of adequate quality to support 100 meters
between a device and the hub.
•
You may want to install a wiring system in your building, or
you may already have one, that allows you to run a 10BaseT
cable to a wall jack.
For Thin cabling
•
When subdividing cable segments, do not randomly pick
any cable length. The IEEE recommends that Ethernet
coaxial cable be subdivided at lengths of 23.4 meters (76.8
feet), or multiples of that length, in order to minimize inter-
nal signal reflections. Using less than 10 ft. of cable
between devices causes reflections. These reflections
reduce the signal strength for large networks. On small net-
works, such as those covering a single floor of a building,
these reflections probably won’t cause problems.