Keysight / Agilent 3787B Digital Data Test Set

Keysight / Agilent 3787B Digital Data Test Set

This Agilent / HP 3787B Digital Data Test Set is used excellent condition. This unit has no options installed.

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CE labeled RoHS Compliant
We typically stock RoHS compliant / CE marked equipment for this Keysight / Agilent 3787B.
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Stock # 45602-2
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Keysight / Agilent 3787B Digital Data Test Set

  • ISDN 'B' or 'D' Channel Protocol Analyzer
  • Comprehensive Bit Error Measurement
  • Analysis at DS1C, DS1, DS0, and DDS
  • Sub-Rate Drop and Insert Capability
  • Built-in Data Logging Capability


The HP 3787B Digital Data Test Set is a Bit Error Rate Tester (BERT) designed for use on T1 leased, Digital Data Systems (DDS), 56kbit/s switched and Packet Switched services transmission line and multiplexing equipment.

Digital data are sold with a guaranteed Quality-of-Service (eg DDS circuits offer > 99.5% Error Free Seconds in a 24hr period and 99.95% availability). To maintain this high quality of service, Service Providers need test equipment that will provide in-service network monitoring and fast out-of-service testing.

The HP 3787B has a comprehensive range of in-service features which maximizes circuit availability by detecting circuit deteriorations and intermittents, before the seriously affect the service.

The HP 3787B also provides comprehensive out-of-service features (eg logic (binary) test patterns, Frame Slips, full range of T1/DDS loopback codes, etc) which are used to provide qualitative results for circuit troubleshooting and end-to-end test results which relate to actual in-service performance.

More information on the 3787B can be found on the Spec Sheet in the links section at the bottom of the page.

Important Notice: Please note that any additional items included with this equipment such as accessories, manuals, cables, calibration data, software, etc. are specifically listed in the above stock item description and/or displayed in the photos of the equipment. Please contact one of our Customer Support Specialists if you have any questions about what is included with this equipment or if you require any additional information.

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DSO Operating Frequency64 kbit/s
DS1 Operating Frequency1.544 Mbit/s
DS1C Operating Frequency3.152 Mbit/s
FramingDS1, DS1C, and DS0B
Line CodeB8ZS, AMI
Error Analysis% Availability, % Unavailability, % Severly Errored Seconds, % Error Seconds, % Degraded Minutes, Count Consecutive SES, Count SES, Count ES, Count Deg Min
Other Included MeasurementsAlarm Seconds, Frame Slips, Protocol Analyzer Interface, DS1/DS1C Signal Voltage, DS0 Bit Monitor, Signaling Bits

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Item Images

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Agilent / HP 3787B Digital Data Test Set
Agilent / HP 3787B Digital Data Test Set
Agilent / HP 3787B Digital Data Test Set
Agilent / HP 3787B Digital Data Test Set

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Manuals, Datasheets, Drivers, Links

Agilent / HP 3787B Datasheet (pdf) 
Link to Keysight / Agilent Website 

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