The NI-2 card is a system processor module that includes the following features: connects to the xTU-C line cards through point-to-point serial data buses on the backplane, contains the ATM switch fabric, supports subtending of as many as 12 subtended node chassis, and provides visual and audible operating status alerts.The OC-3c/OC-3c NI-2 card provides the network OC-3c WAN trunk interface through connectors located on the NI-2 card faceplate, provides an OC-3c subtend interface through optical connectors located on the NI-2 card faceplate, and controls timing and redundancy.The OC-3c/OC-3c NI-2 card SMF (NI2-155SM-155SM2) supports enhanced upstream bandwidth for use with the 8xG.SHDSL line card. For you to achieve maximum bandwidth rates for each 8xG.SHDSL, the updated boot image, ni2-dboot2-mz, must be running on the OC-3c/OC-3c NI-2 card.