Agilent/Keysight 37701A

The Agilent/Keysight 37701A is a digital data tester for installation, maintenance, and troubleshooting of T1, fractional T1, DDS, and datacom circuits. It delivers full transmit, receive, and through-path capabilities for comprehensive in-service and out-of-service testing across central offices, remote locations, and user premises. The unit integrates T1 and DDS testing with built-in CSU emulation and multiplexer/demultiplexer functionality, enabling technicians to validate circuit performance and insert test patterns into individual timeslots, subrates, and overhead channels before connecting user equipment.

– Technical Specifications

Measurement Capabilities:
• Bit-error rate (BER) testing—simple and full error analysis modes
• Signal level measurements on T1 circuits
• Error detection, analysis, and logging across all test patterns
• Frame slips measurement
• G.821 compliance testing with digital and analog measurements
• Time slot delay measurement
• Optional D4 jitter measurement
• Pulse shape, clock slips, and wander measurement (Option 001)

Test Patterns:
• PRBS: 2^15, 2^20, 2^23
• T1/DS1 frame formats: D4, ESF, TIDM, SLC-96
• QRSS, 3 in 24, 8-bit word, loop, and control codes
• DDS stress patterns: TA55
• 256-byte user patterns (DSO only)

Interfaces:
• DS0 A/B, DS1, DSIC
• RS-232-C, RS-449, V.35 (with optional datacom module supporting rates up to 1.544 Mb/s)
• HP-IB and RS-232 remote control

– Key Features

• Built-in CSU emulation for pre-connection circuit verification
• Integrated multiplexer/demultiplexer for timeslot, subrate, and overhead insertion/extraction
• Monitor, through, and drop-insert modes for live-circuit analysis
• Auto-configuration capability
• Results storage and graphic presentation (Option 003)

– Typical Applications

• T1 and fractional T1 circuit commissioning and maintenance
• DDS/Dataport service validation
• Datacom testing up to 1.544 Mb/s
• Signal integrity analysis in telecom networks

– Compatibility & Integration

The 37701A supports standard T1/DS1 interfaces across D4, ESF, TIDM, and SLC-96 frame formats. Optional datacom module integration (e.g., HP 15901A Option 002) extends capabilities to RS-232-C, RS-449, and V.35 interfaces.