The MS-ISA2 (or ISA2-MS in CLI) is a second generation Integrated Services Adapter for multiservice processing, as a resource module within the router system providing packet buffering and packet processing.
The MS-ISA2 fits in an MDA/ISA slot on an IOM4-e and has no external ports, so all communication passes through the Input/Output Module (IOM), making use of the network processor complex on the host IOM for queuing and filtering functions like other MDAs and ISAs.
The actual ingress and egress throughput varies depending on the buffering and processing demands of a specific application, but the MS-ISA2 hardware can support 40 Gb/s of throughput processing. The processed rate (up to 40 Gb/s) is the sum of the upstream and downstream rates (for example, 10 Gb/s up and 30 Gb/s down, or 20 Gb/s up and 20 Gb/s down).