For example: Agilent E4440A or Anritsu 68369
Line Analyzer
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Keysight / Agilent 3770B Overview
Telephone Line Analyzer The HP 3770B measures group delay, attenuation distortion, level from 200 Hz to 20 KHz, weighted noise, noise-with-tone, and impulse noise. L.E.D. readout. Compliant to CCITT standards.