Avaya Lucent TN771D Definity Maintenace / Test Card Circuit Board

Overview
The Avaya Lucent TN771D Definity Maintenance / Test Card Circuit Board is a precision engineered component designed for use with Avaya Definity switching platforms. This board provides built-in test and maintenance capabilities that help technicians quickly diagnose line conditions, verify signal integrity, and perform routine system checks without the need for external equipment. Its rugged construction and reliable performance make it an essential spare for service centers and field engineers who demand fast, accurate troubleshooting.

Key Features

• Integrated test circuitry for voice and data path verification
• Compact form factor that fits standard Definity chassis slots
• High reliability components rated for continuous operation
• Easy installation with plug-in connectors and clear labeling
• Supports both analog and digital signal testing

Technical Specifications

• Manufacturer: Avaya Lucent
• Model / Part Number: TN771D
• Board dimensions: 4.5 in x 3.5 in (approx)
• Operating temperature range: 0 deg to 55 deg C
• Power supply: 48 VDC nominal
• Connector type: Standard Definity backplane interface
• Signal compatibility: T1, E1, analog PSTN lines

Applications
The TN771D test card is ideal for use in telecommunications service bays, carrier central offices, and enterprise PBX environments. It is commonly employed for:

• Routine preventive maintenance of Definity switches
• Rapid fault isolation during outage investigations
• Calibration of line cards and interface modules
• Training and certification labs for Avaya technicians
• Spare parts inventory for quick field replacement

By integrating the TN771D into your maintenance workflow, you can reduce downtime, improve diagnostic accuracy, and extend the life of your Avaya Definity equipment.