ICT is a growing economic sector proposing new products and new services every day for more and more people in the worldwide. In addition, with the recent expansion of connected objects, the communications and services are not limited to exchanges between people, between people and machines, but also between machines themselves. The consequence of the communicating system multiplication is ICT sector uses more and more earth resources and rare earth to design new ICT products. Another issue is that ICT products used for transmitting, processing and storing (big) data consume a lot of energy impacting on greenhouse gas and on climate change. ICT Engineers have then to consider this new problematic increasing their daily workload. One interesting question is to know if Green ICT is a real additional workload for ICT Engineers. This paper presents a simple example based on network installation showing that a traditional Engineering of ICT system with the objective to optimize its time performance can conduct to an environmental-friendly ICT solution minimizing the energy use.