@Mammmood - I never got to dabble in systems engineering of any kind when I was in telecommunications, whether it was hardware or software.
I was a network analyst. My job was to run reports that gave us a breakdown of traffic on the telecommunications network. This was important to know for routing purposes.
For example, did we have any T1s with excess capacity? Conversely, did we have T1s that were taking in too much traffic, in which case we would need to provision a new T1?
I never made that decision. I gave my numbers to the systems engineer and he made the final calls about what to keep, what to take down and what to put up. The analyst is more of a back office position.