Cisco Network Interface Module - Expansion module 4 - ISDN - ISDN BRI - refurbished - for Cisco 4451-X

The Cisco Network Interface Module enhances connectivity with its robust ISDN BRI interface. This expansion module supports wired data link protocols, ensuring seamless communication across various network protocols including RTP and RTCP. With 4 ISDN BRI ports, it allows for efficient management and delivery of data. It includes features like a CSU/DSU, cable testing capabilities, and a comprehensive Management Information Base (MIB). As a refurbished product, it provides an economical solution without compromising on essential functionalities.