Cisco WIC-1B-U

The Cisco WIC-1B-U is a WAN Interface Card (WIC) module designed for Cisco routers. It is a single-port ISDN Basic Rate Interface (BRI) card that provides connectivity to Integrated Services Digital Network (ISDN) networks. The WIC-1B-U supports two B channels and one D channel, allowing for simultaneous voice and data transmission over ISDN lines. It is commonly used in small to medium-sized businesses that require ISDN connectivity for their network infrastructure.