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TPI 550B+ ISDN Test Set in Case - $50 (Houston)
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The TPI 550B+ is a portable, battery-operated Basic Rate ISDN (BRI) test set designed for installing, troubleshooting, and verifying 2-wire U-interface (2B1Q) and 4-wire S/T interface circuits. It supports features like AutoSPID, BERT, and inter-channel delay measurement for video conferencing.
Key Features and Capabilities
Interfaces: Tests 2-wire (U-interface, 2B1Q) and 4-wire (S/T).
Testing: Provides BER testing (BERT) on B-channels (voice/data) and D-channel signaling, supporting 3.1K audio, 64K, and 128/144 KHz IDSL.
Monitoring: Non-intrusive bidirectional D-channel monitoring.
Convenience: Includes a built-in speaker and microphone for hands-free operation.
Indicators: LEDs for Sync, Active, and Ready status.
Optional Features: Some models may include an RS-232 data port for exporting results.
Typical Applications
Line Qualification: Measures
loss to verify line quality and supports EOC loopbacks.
Service Turn-up: Validates BRI service by placing/receiving voice and data calls.
Troubleshooting: Analyzes layer 1, 2, and 3, providing plain English decodes of D-channel cause codes.
The TPI 550B+ is generally considered a rugged, all-weather solution for technicians working in field environments, such as customer premises or in-field repeater housings.