The Ando AQ5521 is an Optical Time Domain Reflectometer (OTDR) for testing, troubleshooting, and fault location in fiber optic networks. Engineered for both field and laboratory deployment, this optical monitor delivers accurate measurements essential for fiber optic network analysis and optimization.
Technical Specifications
Model Variants: AQ5521 / AQ5521B
Product Type: Optical Time Domain Reflectometer (OTDR)
Bit Rate (AQ5521B): 622.08 MB/s
Operating Environment: Field and laboratory use
– Key Features
• Fiber event detection and fault location capability
• Integrated memory for measurement data storage
• User-friendly interface with display and control elements
• Dual-power operation: mains and battery power for portable field measurements
• Data export functionality via USB connectivity
• Event mapping for graphical fiber event representation
• Automatic measurement mode for simplified testing workflows
• Multi-language user interface support
– Typical Applications
• Installation verification and acceptance testing of fiber optic networks
• Cable fault diagnosis and localization
• Network troubleshooting and performance optimization
• Fiber span characterization and loss analysis
• Preventive maintenance monitoring
– Compatibility & Integration
The AQ5521 integrates with complementary optical test modules including Visual Fault Locators (VFL) for break pinpointing, Optical Light Source (OLS) functions, and Optical Power Meter (OPM) capabilities. USB connectivity enables data transfer and remote operation support. The instrument supports field and laboratory workflows with portable operation capability.


















