Product UPC: 098377298793 Cisco Fourth-Generation Multi-flex Trunk Voice/Clear-channel Data T1/E1 Module - Expansion module - T-1/E-1 - for Cisco 4451-XThe Cisco Fourth-Generation T1/E1 Multiflex Trunk Voice and WAN Network Interface Modules (NIMs) support data and voice applications on the Cisco 4451-X integrated services routers. 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 flexib...