Cisco SM-D-48FXS-E

The Cisco SM-D-48FXS-E is a module designed for use with Cisco ISR 4000 Series routers. It is a voice interface card that provides 48 analog FXS (Foreign Exchange Station) ports. These ports can be used to connect analog devices such as telephones, fax machines, and modems to the router, allowing them to be integrated into a VoIP (Voice over IP) network. The module supports various voice features and protocols, including voice quality monitoring, echo cancellation, and voice activity detection.