| network processor card The main computational and storage resource for the LightStream 2020 Asynchronous Transfer Mode (ATM) switch. Each LightStream 2020 switch has one or two NPs. The second card, if present, serves as a backup for the first. Each NP is associated with a floppy disk drive for loading software and a hard disk drive for storing software and configuration data. Each NP also has an access card that provides an Ethernet port. |