Agilent/Keysight J1981B

The Agilent/Keysight J1981B is a portable Voice Quality Tester (VQT) designed for voice-over-packet network analysis and quality assessment. This rugged, Windows NT–based portable PC delivers comprehensive voice quality measurements across TCP/IP networks, supporting R&D, manufacturing, and field service applications where accurate VoP performance data is essential.

– Technical Specifications

Computing Platform
• Operating System: Windows® 98 SE, Windows® NT 4.0 SP 5, Windows® 2000
• Processor: Minimum Pentium® 3 200 MHz; Recommended Pentium® 3 500 MHz
• Memory: Minimum 64 MB; Recommended 128 MB RAM
• Storage: Minimum 100 MB hard disk
• Display: Minimum 800×600 resolution; Recommended 1024×768
• Network Stack: Microsoft built-in TCP/IP

Voice Quality Measurement
• Metrics: Clarity, delay, echo, signal loss
• Detection: Voice activity detection (VAD), DTMF tone detection
• Test Generation: Tone and noise generators, wave file playback and recording
• PESQ Reporting: Average, last, high, and low LQ scores; overall average symmetrical and asymmetrical disturbance; average estimated delay
• Measurement Iterations: Repeat N times or continuous operation up to 1440 iterations maximum
• User-Configurable Thresholds: PESQ Listening Quality (LQ) score

Telephony Interfaces
• Analog FXO: 2 ports, RJ11 modular jacks, variable loop current limiting, analog signaling support

Expansion & Storage
• PCMCIA Card Slots: 2
• Optical Drive: CD-RW (read/write)
• Floppy Drive: High-density
• Integrated Audio: Speakers

Environmental Operating Conditions
• Temperature: +5°C to +40°C (+41°F to +104°F)
• Humidity: 5% to 93% relative humidity, non-condensing
• Altitude: -305 to 4570 m (-1000 to 15,000 feet)

– Key Features

• Two analog FXO ports for simultaneous voice path testing
• PESQ-based listening quality assessment with configurable thresholds
• Integrated tone, noise, and waveform generation and capture
• Support for up to 1440 continuous measurement iterations
• Dual PCMCIA expansion for field-deployed configurations

– Typical Applications

Voice quality validation in VoIP networks, pre-deployment network assessments, manufacturing QA, and service technician field testing.

– Compatibility & Integration

The J1981B functions as a standalone test system or implements client/server architecture for remote testing. It augments traditional telephony test suites such as TIMS and operates across most TCP/IP network topologies using standard hardware platforms.