The screen of the STP to make it more effective requires a configuration of interconnection with Earth (with continuity to the terminal), with the STP is commonly used connectors RJ49. However it is more expensive and requires more setup time. The level of protection of the STP to external shocks is greater than the one offered by UTP. In this case, each pair is covered by a conductive mesh which acts as a screen against interferences and electrical noise. But at high speeds it can be vulnerable to electromagnetic interference of the environment. It is undoubtedly that so far has been better accepted, accessibility cost and easy installation. The connector most commonly used in this type of cable is the RJ45, similar to the RJ11 used in phones (but a little large), but they can also be used other (RJ11, DB25, DB11, among others), depending on the network adapter. Twisted pair cable is the most used, it does not possess any additional protection to the PVC coated and it has 100 Ohm impedance.
