Fluke Networks 635A QuickBERT‑T1 Handheld T1 Analyzer BERT Tester

Fluke Networks Model: 635A QuickBERTâT1 Handheld T1 Analyzer BERT Tester Sn: 1775001 Made in USA Condition is for parts. Battery needs to be replaced - Doesn't power on. Comes with power cord, large variety of cables, user manuals and case. ð¯ Fluke Networks 635A QuickBERTâT1 Handheld T1 Tester / Analyzer The Fluke 635A QuickBERTâT1 is a rugged, compact handheld tester designed for fast and accurate diagnostics of T1/DS1 telecom circuits. Ideal for field technicians and network engineers, it combines powerful testing features with intuitive controls in a lightweight, battery-powered package. ð Key Features Comprehensive T1 Testing Performs Bit Error Rate Testing (BERT) for full, fractional (Nx56/Nx64), and unframed T1 circuitsâwith support for HDSL loop codes. Auto-Detect & Display Instantly identifies and shows framing type (NONE/D4/ESF/SLC96), line coding (AMI or B8ZS), clock slips, signal level, frequency, and alarms. Error Injection Mode Allows insertion of bipolar violations, logic/frame-bit errors, and CRC events to verify network error handling. Dual Receivers Includes both a primary receiver for signal testing and a reference receiver for clock-slip analysis and signal integrity. Advanced Pattern Handling Supports 11 BERT patternsâincluding QRSS, NET55, user-definable patternsâand features a âthruâ mode to retransmit received data. Voice Monitoring Built-in speaker and optional headset port let you monitor individual DS0 voice channels and signaling bits. Durable & Portable Weighing only ~1.8â¯kg (4â¯lb), itâs rugged and easy to deploy. Power via rechargeable NiMH battery or external adapter. Result Printing & History Built-in RSâ232 port allows wired printing or export to PC. An internal indicator shows intermittent errors over time. âï¸ Technical Specifications Specification Details Form Factor Handheld (â 1.8 kg) Bit Error Rate (BERT) Full/fractional (Nx56/Nx64) T1 support Framing Types Supported NONE, D4, ESF, SLCâ96 Line Coding AMI and B8ZS Frequency & Level Measurement DS1/DS0 frequency and amplitude Clock Slip Detection Using dual RX and REF receivers Error Types Injected BPV, logic bit, frame bit, CRC User-Defined BERT Pattern Custom 64-bit pattern available Power NiMH rechargeable battery or AC adapter Connectivity RSâ232 serial for printing/data export Additional Features Thru mode, onboard speaker, signal history 𧪠Typical Applications Verifying integrity of T1 circuits (belt testing, provisioning) Diagnosing line coding/framing issues (AMI/B8ZS, ESF/SLC96) Clock-slip troubleshooting for DS1 synchronization Voice channel monitoring on DS0 lines Field support verifying network performance and compliance