Cisco VIC3-2FXS/DID

Cisco VIC3-2FXS/DID Overview

The Cisco VIC3-2FXS/DID is a third-generation voice interface card. It is designed to enhance voice connectivity in Cisco 2800, 2900, 3800, and 3900 series branch routers. This card offers two interfaces: Foreign Exchange Station (FXS) and Direct Inward Dialing (DID) functionalities through RJ-11 ports. These ports are crucial for connecting traditional analog devices. Devices like standard telephones, fax machines, and modems can connect directly to the router. The card aims to bridge legacy analog technologies with modern IP-based networks, enabling flexible connectivity options.

FXS Interface Capabilities

The FXS (Foreign Exchange Station) port connects directly to end-user analog devices. This includes telephones, fax machines, and modems. It supplies critical functionalities such as:

• Ringing voltage to notify users of incoming calls.
• Dial tone generation, enabling end devices to initiate calls.
• Battery polarity reversal, essential for signaling that a call has been answered or disconnected.
• Caller ID support, which allows connected devices to display caller information and improves user experience.

These features make the FXS interface useful for integrating legacy analog devices within a modern VoIP (Voice over IP) infrastructure. It serves as a bridge between traditional telephony devices and Cisco’s IP-based Unified Communications solutions.

DID Interface Capabilities

The DID (Direct Inward Dialing) interface connects to the Public Switched Telephone Network (PSTN). It serves as a channel for incoming calls from an external central office (CO). The DID port is specifically designed for inbound call traffic. It provides efficient routing of calls directly to the appropriate extensions or devices within an organization. However, it is essential to note that:

• DID mode only supports incoming calls and does not generate outgoing calls.
• Caller ID support is not available in DID mode due to the nature of the DID signaling system.

Key Advantages and Use Cases

The Cisco VIC3-2FXS/DID card offers several advantages for businesses. These include maintaining traditional analog lines while transitioning to digital networks:

• Seamless Integration with Legacy Devices: By providing FXS ports, the card allows businesses to use traditional analog telephones, fax machines, and similar devices. This eliminates the need for significant upgrades or replacements.
• Cost-Effective Incoming Call Management: The DID ports provide a cost-effective solution for managing incoming calls from the PSTN. This is especially useful in environments where internal calls need to be directed efficiently to specific extensions or departments.
• Enhanced Flexibility and Scalability: The card supports Cisco branch routers from the 2800, 2900, 3800, and 3900 series. This enables easy scaling as business needs grow or change, ensuring a future-proof investment.

Technical Specifications

• Supported Routers: Compatible with Cisco 2800, 2900, 3800, and 3900 series routers.
• Port Types: Two RJ-11 interfaces for FXS and DID connectivity.
• Signaling Capabilities: Supplies ringing voltage, generates dial tone, and provides battery polarity reversal in FXS mode.
• Caller ID Support: Available in FXS mode but not in DID mode.
• Use Cases: Ideal for connecting analog telephones and fax machines, and managing incoming calls from the PSTN via DID lines.

Conclusion

The Cisco VIC3-2FXS/DID card is a versatile and reliable solution for integrating legacy analog devices with Cisco’s modern IP-based Unified Communications systems. By providing both FXS and DID functionalities, the card allows businesses to manage incoming calls efficiently. It maintains compatibility with existing analog infrastructure and supports various Cisco branch routers. This ensures flexibility and scalability, making it suitable for growing organizations that seek to leverage their current investments while transitioning to newer technologies.

You can also visit the manufacturer’s website link for more information.

You can also visit the Cisco VIC-4FXS/DID , Cisco NME-16ES-1G-P , Router Card pages if you wish.