Communication infrastructure or network infrastructure are the same terms used, which are the hardware and software resources of the whole communication/network system. It provides the communication signal and information between the users and the system of the networks.
Routers help to connect the network of the infrastructure so to allow the systems to communicate with one another. Depending on your requirements, a router must have sufficient capacity after deployment to sustain growth and usage. Similarly, switches are used to connect the systems within the network infrastructure.