Cisco 4th Gen Voice/Fax Network Interface Module NIM-2FXS/4FXO

BRAND NEW. FACTORY SEALED. FULL CISCO WARRANTY INCLUDED. MANUFACTURED BY CISCO. FROM CHICAGO COMPUTER SUPPLY.

Overview

The Cisco NIM-2FXS/4FXO is a fourth-generation analog voice Network Interface Module designed for Cisco 4451-X Integrated Services Routers. It combines two FXS ports and four FXO ports into a single module, enabling organizations to connect analog phones while maintaining direct PSTN access.

With a built-in digital signal processor, this module removes the need for a separate PVDM on the router. It enables smooth migration from legacy analog voice systems to VoIP while keeping existing phones and lines in service.

Key Features

• Two FXS ports for analog phones and fax devices
• Four FXO ports for PSTN and PBX connectivity
• Built-in DSP eliminates the need for external PVDM
• Supports the reuse of existing analog phones and lines
• Echo cancellation up to 128 ms for clear voice quality
• Designed for Cisco 4451-X Integrated Services Routers

Technical Specifications

Manufacturer: Cisco

Product Type: Network Interface Module

Model: NIM-2FXS/4FXO

Ports: 2 x FXS, 4 x FXO

Applications: Voice and fax

Form Factor: Plug-in module

DSP: Integrated

Echo Cancellation: Up to 128 ms

Platform Support: Cisco 4451-X Series

Use Cases

The NIM-2FXS/4FXO is ideal for enterprises and branch offices transitioning to VoIP while retaining analog phones and PSTN lines. It supports hybrid voice environments, small PBX integrations, and locations that require both internal analog extensions and external telephone network connectivity.

Why Choose the NIM-2FXS/4FXO

• Combines FXS and FXO in one compact module
• Preserves investment in existing analog voice systems
• Simplifies VoIP migration with built-in DSP
• Delivers reliable echo cancellation for voice quality
• Genuine Cisco hardware with full warranty

FAQs

What is the Cisco NIM-2FXS/4FXO used for?

It connects analog phones and PSTN lines to Cisco 4451-X routers using FXS and FXO ports.

What devices connect to the FXS ports?

Analog telephones and fax machines connect directly to FXS ports.

What do the FXO ports connect to?

FXO ports connect to PSTN lines or PBX systems.

Does this module require a PVDM?

No. It includes a built-in DSP and does not require a separate PVDM.

Is this product new and covered by the Cisco warranty?

Yes. It is brand new, factory sealed, and includes the full Cisco warranty.