Level vs Edge Trigger Network Event Mechanisms

The short answer is, edge-triggered means that you get notified only when the event is detected (which takes place, conceptually, in an instant), while level-triggered means you get notified whenever the event is present (which will be true over a period of time). For example, in an edge-triggered system, if you want a notification to signal you when data is available to read, you’ll only get that notification when data was not available to read before, but now it is. If you read some of the available data (so that remaining data is still available to read) you would not get another notification, and if you read all of the available data, then you would get another notification when data became available to read again. In a level-triggered system, you’d get that notification whenever data is available to read.

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