A queueing system is often noted by A/B/c/N/K where

**A:**- interarrival time distribution
**B:**- service time distribution
**c:**- number of parallel servers
**N:**- queueing capacity
**K:**- size of the calling population

A few notes:

- A few special notations: M for exponential distribution, G for general distribution, D for constant.
- When the queueing capacity or the calling population size, or both are infinite, they can be omitted from the notation, e.g. M/M/1 meaning expoential distribution for arrival and service time with one server, the queueing capacity and the calling population size are both infinite.

See Example 7.3 on page 241-242

Meng Xiannong 2002-10-18