Final answer:
The visual description of physical communication links is called a schematic, which uses abstract graphic symbols to represent system components, not to be confused with a flowchart for process steps or a blueprint for architectural plans.
Step-by-step explanation:
When referring to a visual description of all the physical communication links, the correct term is a schematic. A schematic is a diagrammatic representation that illustrates the elements of a system using abstract, graphic symbols rather than realistic pictures. A flowchart is usually employed to display the steps in a process, while a diagram is a broader term that can refer to any visual representation of information, including a flowchart or a schematic. A blueprint, on the other hand, is typically associated with detailed architectural or engineering plans.