Cisco NIM-4FXS 4-port Network Interface Module - FXS for ISR 4000 Series Routers NIM4FXS

Description:

The Cisco NIM-4FXS 4-Port Network Interface Module is used in Cisco ISR 4000 Series routers to provide Foreign Exchange Station (FXS) analog voice connectivity for enterprise voice and unified communications systems. Commonly installed in branch office routers, IP telephony deployments, VoIP gateways, and integrated voice networks where analog phones, fax machines, or modems must connect to IP-based communication infrastructure. Network administrators, telecom engineers, and system integrators use this module for voice network expansion, telephony system upgrades, and replacement of legacy analog interface modules in Cisco ISR platforms.

Applications:

The Cisco NIM-4FXS module enables analog voice connectivity within modern IP-based communications systems by allowing traditional analog devices to connect through Cisco ISR 4000 Series routers. It is commonly deployed in branch offices, enterprise communication systems, call centers, and small business VoIP environments where analog phones, fax machines, and legacy voice equipment must integrate with IP telephony networks. The module helps organizations transition from traditional telephony to unified communications while maintaining compatibility with existing analog devices.

Technical Specifications:

• Manufacturer Part Number (MPN): NIM-4FXS
• Product Type: Network Interface Module (FXS Voice Module)
• Ports: 4 FXS analog voice ports
• Interface Type: RJ-11 analog telephone interfaces
• Compatible Platforms: Cisco ISR 4000 Series Routers
• Supported Devices: Analog phones, fax machines, modems
• Voice Signaling: FXS (Foreign Exchange Station)
• Voice Codec Support: G.711, G.729 and other Cisco-supported codecs
• Slot Type: NIM (Network Interface Module) slot
• Integration: Cisco Unified Communications and VoIP systems
• Mounting Type: Router-installed module
• Operating Temperature Range: 0 °C to 40 °C
• Management: Managed through Cisco IOS software

Common Replacements:

• Cisco VIC2-4FXS Voice Interface Card
• Cisco NIM-2FXS Voice Interface Module
• Cisco NIM-4FXO Voice Interface Module