Kendall's notation

In queueing theory, a discipline within the mathematical theory of probability, Kendall's notation (or sometimes Kendall notation) is the standard system used to describe and classify a queueing node.

D. G. Kendall proposed describing queueing models using three factors written A/S/c in 1953[1] where A denotes the time between arrivals to the queue, S the service time distribution and c the number of service channels open at the node.

The second M means that the service time is Markovian: it follows an exponential distribution of parameter μ.

A small population will significantly affect the effective arrival rate, because, as more customers are in system, there are fewer free customers available to arrive into the system.

The Service Discipline or Priority order that jobs in the queue, or waiting line, are served:

Waiting queue at Ottawa station .
M/M/1 queue diagram
An M/M/1 queueing node.