Time-sensitive and Deterministic Networking Whitepaper

Best effort packet service is familiar to users of routers and bridges. It delivers most packets, most of the time, mostly in order. There are no guarantees. Certain service classes or can be given preferential treatment over other classes or flows. Performance is statistical. If one plots a histogram (Figure 1) of the probability of delivery, end-to-end latency, or variation in latency over a given time interval, one sees long, low-probability tails on every curve.