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Join Date: May 2004
Location: Bull Mountain, OR
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18AWG is the "thickness" of the cable. AWG = American Wire Gauge. The smaller the number, the thicker the cable wire. The thicker the cable wire, in theory, the better the signal propagation. However, if the wire is CCA (Copper Coated Aluminum), which most older wire is, the less reliable it is as opposed to a solid copper wire.
CL2 just means that it has met certain standards for fire safety. It has nothing to do with the ability of the cable to transmit data.
The RG6 "shielding" just means that there is an extra layer of protection for interference.