Cisco SM-X-24FXS/4FXO ISR 4000 Series 24x FXS 4x FXO Router Service Module

The Cisco SM-X-24FXS/4FXO is a router service module manufactured by Cisco. It features a single wide form factor and provides 24 FXS ports and 4 FXO ports for analog voice connectivity over IP networks.

Compatible with the Cisco Integrated Services Router (ISR) 4000 Series, this add-on module supports deployment in branch offices requiring multiple analog station lines or trunk connections to the PSTN. The unit supplies loop-start signaling on both port types and uses network modules powered via host chassis bus without needing external power input.

Cisco SM-X-24FXS/4FXO: 24-port FXS and 4-port FXO single-wide service module.