Cisco ASR 900 Series (Aggregation Services Routers) is a family of modular, high-density routers designed primarily for service provider “edge” and metro aggregation. Think of them as the versatile “middle managers” of a network—they take traffic from cell sites or businesses and bundle it together for the high-speed core.

Cisco ASR 903 is a modular, high-density aggregation router designed primarily for Carrier Ethernet, mobile backhaul, and business service provider networks. It’s essentially a “Swiss Army knife” for the provider edge, balancing a compact form factor with serious redundancy