Cisco 4-Port FXS,FXS-E and DID Network Interface Module for 4000 Series Integrated Service Router - Refurbished

The Cisco 4-Port FXS, FXS-E and DID Network Interface Module is compatible with Cisco 4000 Series Integrated Service Router. It hosts the Cisco network interface modules, which have evolved from the enhanced high-speed WAN interface card, increasing port density and module capability. This module is designed with four ports.