Agilent/Keysight 37701B

The Agilent/Keysight 37701B is a portable T1 datacom tester for installation and maintenance of T1, fractional T1, and datacom circuits. It delivers comprehensive measurement solutions in a single unit, supporting out-of-service terminal testing and in-service monitoring including through mode and drop-insert testing. The instrument performs bit error rate testing (BERT) on unchannelized and channelized circuits, signaling bit control with capture and dialing, and G.821 measurements with timestamped graphical logging.

Technical Specifications

• Maximum datacom interface speed: 1.544 Mb/s (with optional HP 15901A Option 002)


• Internal multiplexer capacity: up to 384 kb/s for test pattern/tone/data insertion or extraction


• Power requirement: three-conductor line power outlet with protective earth ground

Key Features

• T1 and fractional T1 circuit testing and maintenance


• Unchannelized BERT with wide digital pattern selection


• Channelized BERT with VF tones and digital patterns


• Signaling bit control, capture, and dialing


• Time slot delay measurement


• Monitor, through mode, and drop-insert test modes


• Transmit, receive, and through operational modes


• Portable, lightweight form factor

Datacom Capabilities Optional HP 15901A Option 002 module enables RS-232-C, RS-449, and V.35 interface testing up to 1.544 Mb/s, extending the instrument's functionality for dedicated datacom measurements.

Compatibility & Integration Instrument control and data transfer supported via GPIB, USB, and LAN interfaces through Agilent/Keysight IO Libraries Suite.