Some Design Considerations for Narrow-Band Medical Telemetry Over the Switched-Message Network

Some of the considerations leading to the design of a three-channel narrow-band analog system for transmitting medical data, primarily electrocardiograms (EKG), over dialed connections are discussed. The advantages and disadvantages of several methods of implementing such systems are compared on the basis of the general systems requirements, the nature of the data to be transmitted, and the limitations imposed by the transmission medium. One system developed for multichannel medical applications and its performance are described in some detail.