The Cisco® Fourth-Generation 1-. 2-. 4- and 8-PortT1/E1Multiflex Trunk Voice and WAN Network Interface Modules (NIMs) support data and voice applications on the Cisco 4451-X Integrated Services Routers (Figure 1). These cards combine WAN-interface-card (WIC). voice-interface-card (VIC). ISDN Primary Rate Interface (PRI). dial-access integration. and channelized-data (CE1T1) functions to provide unparalleled flexibility. versatility. and investment protection through their many uses. Customers who choose to integrate data and voice in multiple steps preserve their investment in a T1/E1 WAN interface.
