Voice-frequency telephone circuit design by simulation

Many present-day voice-frequency telephone circuits require two or more electrically short links in tandem, minimum capital investment, and less than a 2-week completion interval. The engineering, installation, and circuit line-up must be done rapidly and accurately. One approach to rapid and accurate design and line-up is through simulation. A practical design for a transmission-circuit simulator to determine impedance, return loss, and frequency-attenuation characteristic is discussed.