RSC works by using the network interface card (NIC), which looks at the data from incoming packets and strips them before combining -- or coalescing -- these segments into a singular packet. The NIC will then send this coalesced packet to an application, resulting in the CPU needing to intervene much less on the receive-side. This, in turn, allows the CPU to take care of other important tasks, including increased productivity and scalability support. RSC only supports the receive-side of network traffic, so it does not affect outgoing network traffic.
To use RSC, administrators must have a network adapter card that is RSC-capable. If the organization has a virtualized environment, the NIC must also be able to support single-root I/O virtualization.