Types of Cables:
You have CAT5, CAT5E, CAT6, CAT6A, CAT7 and even CAT8 now. But do you know the type of sheilding you need for your installation? UTP? STP? FTP? Knowing this is of major importance to the performance of your network. Not knowing could leave you in quite a tangle.
Unshielded Twisted Pair.
This is the most commonly used data cable. There is no additional protection other than the pvc jacket, as it only has 100OHM independence.
Foil Twisted Pair.
In this type of cable the pairs are not shielded, but it has a global screen to improve the level of protection against external interference. Its typical independence is 120Ohm and its transmission properties are similar to that of UTP.
Shielded twisted pair.
The cores are covered in a conductive mesh which acts as protection against interference and electrical noise. Its independence lies at 150ohm and provides a higher level of protection than UTP. But, it is more expensive and requires a greater setup time.
All types of shielded cable are used to protect against EMI (Electromagnetic interference) STP provides the greatest form of protection compared to UTP and FTP.