Agilent / HP 3780A OPT 001, 101 Pattern Generator / Error Detector

The HP 3780A Pattern Generator / Error Detector is a comprehensive error measuring set in one portable package
for use in manufacturing, field trials, commissioning and maintenance of digital transmission terminal and link equipment.
The instrument measures binary errors and code errors in digital transmission
equipment operating at rates between 1 kb/s and 50 Mb/s.
Frequency offset generation and measurement are provided at the standard PCM / TDM transmission rates. A range of standard PRBS test patterns and automatic pattern recognition/synchronisation are provided for simple performance checks. It also has flexible WORD generation and zero substitution to explore regenerator timing recovery performance and detect systematic errors.
Binary clock and data or ternary coded data interfaces can be selected
with automatic equalisation at 2,8 and 34 Mb/s on the receiver.
Results are displayed as error COUNT or BER over a range of gating periods,
and can be logged or presented graphically on an external printer.

OPT 101: f1=1.544; f2=6.312; f3=44.736 kHz.