The Cisco second-generation network interface module (NI-2) for Cisco DSLAMs with NI-2 is a system processor module. An NI-2 module is installed in a Cisco DSLAM with NI-2 and performs central processor, host, and system controller functions. The NI-2 network interface module runs Cisco IOS software. Network interfaces for DS3 type NI-2 modules are on the system I/O card installed on Cisco 6130 NI-2 DSLAM backplanes. In the case of the two OC-3 types, the NI-2 module faceplate provides the required network optical interfaces.The NI-2 module performs the following system tasks: Contains the ATM switch fabric; Provides the network WAN trunk interface (either DS3 or OC-3); Provides the subtending interfaces to subtended Cisco 6100 series DSLAMs with NI-2 Controls timing and redundancy; Provides central office (CO) facility alarm relay contact interfaces and an alarm cut-off switch; Provides operating status visual and audible indications; Performs subtending and other control functions.