Nortel NT8D21AB Ring Generator Card

Overview
The Nortel NT8D21AB Ring Generator Card is a high performance signalling module designed for integration into Nortel digital telephony platforms. This card provides reliable and precise ring voltage generation for a wide range of subscriber lines, ensuring clear and consistent ring tones for end users. Engineered for durability and ease of installation, the Ring Generator Card helps maintain optimal network performance in both enterprise and carrier environments.

Key Features

• Accurate ring voltage generation up to 90 volts rms for standard analog lines
• Adjustable ring frequency range from 20 to 40 hertz
• Built-in fault detection and alarm reporting for rapid troubleshooting
• Compact 3U rack-mount form factor for space efficient deployment
• Compatibility with Nortel DMS and other Nortel digital switching systems
• Low power consumption for reduced operational costs

Technical Specifications

• Model number: NT8D21AB
• Manufacturer: Nortel
• Ring voltage: 0 to 90 volts rms
• Ring frequency: 20 to 40 hertz
• Supply voltage: 48 volts dc
• Current draw: less than 2 amps per card
• Operating temperature: 0 to 55 degrees celsius
• Storage temperature: -20 to 70 degrees celsius
• Dimensions: 3U height, standard rack width
• Connector type: Standard Nortel ring output connector

Applications
The NT8D21AB Ring Generator Card is ideal for:

• Enterprise PBX installations requiring reliable ring signaling for hundreds of extensions
• Carrier central offices that need to support residential and small business analog lines
• Upgrade projects where existing ring generators are being replaced with a more efficient module
• Telecom test labs that require configurable ring voltage and frequency for equipment validation

By delivering precise ring signals and robust monitoring capabilities, the Nortel Ring Generator Card helps service providers maintain high quality voice service and reduce downtime, making it a valuable addition to any Nortel based telephony system.