While you are documenting your current network environment, take special note of areas where you are currently experiencing problems. If you stabilize your network before deploying a new operating system, deployment and troubleshooting will be easier, and you can have increased confidence in the upgraded network.
Permittivity, also called electric permittivity, is a constant of proportionality that exists between electric displacement and electric field intensity. This constant is equal to approximately 8.85 x 10-12 farad per meter (F/m) in free space (a vacuum).
These are epsilon and mu, the electrical permittivity and the magnetic permeability of a material. Every dielectric material also has an associated loss, related to the imaginary part of its electrical permittivity, which will increase with frequency to the point where it may even become dominant in the GHz range.