Multiple options will be discussed in this section, and we'll start by defining the term carrier grade. This seems like the perfect start. So, what does this term mean in a telecommunications environment? It refers to a system, software, and even hardware components that are really reliable. Here, I am not referring only to the five-nines or six-nines that CGL provides because not all industries and scenarios require this kind of reliability. We are only going to refer to something that can be defined as reliable in the scope of a project. For a system, software, or hardware component to be defined as carrier grade, it should also prove itself as well tested along with all sorts of functionalities, such as high availability, fault tolerance, and so on.
These five-nines and six-nines refer to the fact that a product is available 99.999 or 99.9999 percent of the time. This translates per year in a downtime of around 5 minutes for five-nines and 30 seconds for six-nines...
