This cable, also known as an ScTP cable, takes the concept of STP and wraps each pair in foil to further improve EMI reduction. This can be seen in the following picture:
Figure 8.10: ScTP cable
The preceding picture can be found at https://en.wikipedia.org/wiki/Twisted_pair#/media/File:S-FTP_CAT_7.jpg. This picture is under the public domain.
Now that we have looked at the different types of twisted pair cables, let's learn about the plenum outer coating present in them.
