What is data deadband in telemetry, and why is it used?

• A. A method to encrypt data during transmission.
• B. A threshold to suppress transmission of unchanged data.
• C. A rate limiter on network bandwidth.
• D. A type of data compression algorithm.

Answer: (B)

In telemetry, data deadband is a threshold that decides when a measured value is important enough to report. If the value changes by less than this threshold, the system keeps using the previously transmitted value and doesn’t send a new update. Only changes that exceed the deadband trigger a transmission. This helps reduce unnecessary data flow, saving network bandwidth and power, and it also filters out tiny fluctuations or noise that aren’t meaningful for monitoring.

For example, with a temperature sensor and a deadband of 0.5 degrees, small jitters around a stable temperature won’t trigger transmissions, but a real shift beyond 0.5 degrees will be reported. It’s a balance: set the threshold so you don’t miss important events, but also don’t flood the network with insignificant changes.