A Multichannel Telemetry System Upon ``Request'' for Industrial Applications
Viktor POLLAK, David Freestone · IEEE Transactions on Industrial Electronics and Control Instrumentation · 1975
The article describes a low-cost multichannel system for telemetering and remote signaling ``upon request''. The system is intended for use over dial-up channels of the public telephone systm or other voice grade channels with comparable quality. Continuous transmission over dedicated links is also feasible.