Demand assignment

In telecommunication, a demand assignment is an operation in which several users share access to a communications channel on a real-time basis, i.e. , a user needing to communicate with another user on the same network requests the required circuit, uses it, and when the call is finished, the circuit is released, making the circuit available to other users.

Note: Demand assignment[?] is similar to conventional telephone switching, in which common trunks are provided for many users, on a demand basis, through a limited-size trunk group[?].

Source: from Federal Standard 1037C and from MIL-STD-188