Cisco WIC-1B-S/T

The Cisco WIC-1B-S/T is a WAN Interface Card (WIC) module designed for Cisco routers. It provides a single port that supports both Basic Rate Interface (BRI) and Serial connections. The "B" in the model number stands for BRI, which is a digital ISDN interface used for voice and data communication. The "S/T" indicates that the card supports both S/T (S interface and T interface) connections, which are different types of BRI interfaces. The WIC-1B-S/T module allows the router to connect to ISDN networks or other devices using BRI or Serial connections.