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Understanding Twisted Pair Technologies
Can I tell twisted pair cables apart by looking at them?
In many cases, different Cat
levels of cable can look identical (and use the same physical
connectors on the ends of cables), and still have different data-carrying
capabilities and performance. Among Unshielded Twisted Pair, for
example, Cat 3 and Cat 5 cables might look interchangeable, but due
to their hardware characteristics, Cat 5 performs better than Cat 3
at higher data transmission speeds.
Can I substitute one lookalike cable for another?
In general in the Unshielded Twisted
Pair world, a higher-level Cat cable can be substituted for
a lower one without affecting network reliability or speed.
However, the same is not true in
reverse – if you’re using your cable at its maximum rated
speed, and replace a cable with one of a lesser Cat level, it
may not work (worst case) or it may slow down your network.
How do I know which to use?
Selection of the proper variety of
twisted pair cable requires that you know the network hardware communication
standard used at your site (or that you determine the standard to
be used, at a new site), and the hardware that must be connected.
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