Cisco NIM-2FXO 2 Ports Voice Fax Module
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NIM-2FXO Cisco Fourth-Generation Interface Module Factory New

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Part Number#: NIM-2FXO
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Short Description:
NIM-2FXO Cisco Fourth-Generation Network Interface Module - Voice / FAX Module - 2 Port FXO (Universal) | Made by Cisco | New Factory Sealed | Call
Product Condition:
New Retail Factory Sealed
Warranty provided by ALLHDD.COM:
90 Days

Overview of the Cisco Interface Module

The Cisco NIM-2FXO is a Fourth-Generation Network Interface Module, commonly known as a NIM, designed by Cisco for integration into network routers. Specifically, it functions as a Voice/FAX Module, providing 2-Port FXO (Universal) connectivity.

Purpose of a Network Interface Module (NIM)

A Network Interface Module serves as an expansion module that can be inserted into a network router. It adds specific functionalities and capabilities to the router, enabling it to handle various tasks beyond standard routing functions.

Understanding the Technical Specifications

Voice/FAX Module

  • Voice and FAX Capabilities: The module is equipped to handle voice and fax communications, making it suitable for applications such as telephony and fax services.

2 Port FXO (Universal)

  • 2 Port FXO: This indicates the module's provision of two Foreign Exchange Office (FXO) ports, which are used for connecting to analog telephone lines. The FXO ports are versatile, supporting a range of telephony applications.

Importance of Voice/FAX Modules in Networking

Telephony Integration

  • Voice/FAX modules enable routers to integrate with traditional telephony systems, supporting voice communication over the network.

Fax Services

  • With fax capabilities, these modules facilitate the transmission of faxes over the network, streamlining document communication.

Unified Communication

  • Modules like the Cisco NIM-2FXO contribute to unified communication strategies by combining data and voice services on a single network infrastructure.

Application in Network Routers

Integration into Cisco Routers

  • The Cisco NIM-2FXO is specifically designed for integration into Cisco routers, enhancing their capabilities to support voice and fax services.

Telephony Infrastructure

  • It plays a crucial role in the establishment of telephony infrastructure within a network, enabling voice communication over IP networks.

Benefits of Cisco NIM-2FXO Fourth-Generation Module

Versatile FXO Ports

  • The inclusion of 2 FXO ports provides versatility, allowing the module to connect to various analog telephony services.

Unified Communication Support

  • Supporting voice and fax capabilities, the module contributes to the implementation of unified communication strategies within an organization.

Seamless Integration with Cisco Routers

  • Designed by Cisco, the NIM-2FXO seamlessly integrates into Cisco routers, ensuring compatibility and efficient functionality.

Power Requirements and Usage

The NIM-2FXO Cisco 2 Ports Voice Interface Card is designed to work with Cisco Integrated Services Routers (ISRs) and provides two analog FXO ports for connecting to Public Switched Telephone Networks (PSTNs) or Private Branch Exchanges (PBXs).

Regarding power requirements, the NIM-2FXO card gets its power directly from the Cisco ISR that it is installed in. The card does not require any additional power source or power supply. However, it's important to make sure that the ISR provides enough power to support the NIM-2FXO card and any other modules installed in the router.

In terms of usage, the NIM-2FXO card can be used for a variety of voice applications such as:

  • Making and receiving phone calls over a PSTN or PBX network
  • Connecting to analog telephony devices such as fax machines or analog modems
  • Implementing analog backup lines for voice communication in the event of a network outage
  • Integrating legacy analog voice equipment with a VoIP network

To use the NIM-2FXO card, you will need to configure it using the Cisco IOS command-line interface (CLI) or a graphical user interface (GUI) such as Cisco Configuration Professional. This configuration will include settings such as signaling type, dial-peer configuration, and call routing rules.

Security and Encryption Features

The NIM-2FXO Cisco 2 Ports Voice Interface Card provides security and encryption features that help to protect voice communication traffic from unauthorized access and interception. Some of the security and encryption features available include:

  • Secure Real-Time Transport Protocol (SRTP): The NIM-2FXO card supports SRTP, which provides encryption for voice communication traffic. SRTP helps to ensure that voice communication traffic is protected from unauthorized access and interception.
  • Voice VLAN: The NIM-2FXO card supports the use of VLANs to segregate voice communication traffic from other types of network traffic. The use of VLANs helps to prevent unauthorized access to voice communication traffic and ensures that voice traffic is prioritized for optimal performance.
  • Access Control Lists (ACLs): The NIM-2FXO card supports the use of ACLs to restrict access to voice communication traffic. ACLs can be used to specify which devices or users are allowed to access voice communication traffic and can be used to prevent unauthorized access.
  • Secure Shell (SSH): The NIM-2FXO card supports the use of SSH to provide secure remote access to the card. SSH encrypts all data transmitted between the card and remote devices, helping to ensure that sensitive information is protected from interception.
  • Network Address Translation (NAT) Traversal: The NIM-2FXO card supports NAT traversal, which allows for voice communication traffic to pass through firewalls and other security devices that use NAT. NAT traversal helps to ensure that voice communication traffic can be transmitted securely even when passing through potentially insecure networks.

General Information about this Cisco NIM-2FXO

Technical Information

  • Application/Usage: Voice


  • Interfaces/Ports Details: 2 x FXO Network


  • Compatibility: Cisco 4451-X Integrated Services Router

In summary, the Cisco NIM-2FXO Fourth-Generation Network Interface Module is a valuable component for routers, adding voice and fax capabilities with its 2-Port FXO (Universal) connectivity. Its role in facilitating telephony services, fax communication, and supporting unified communication strategies makes it a versatile and essential module in networking infrastructure.

Product Condition:
New Retail Factory Sealed
Warranty provided by ALLHDD.COM:
90 Days

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