See QRS.

Synonym quadrature phase-shift keying.

A digital signal having four significant conditions.

Any operation which obtains either data or attributes from an object [POSIX.6].

In adaptive high-frequency (HF) radio, an automatic-link-establishment (ALE) call that requests responses from stations having connectivity to the destination specified in the call.

A set of items, such as telephone calls or packets, arranged in sequence.
Note: Queues are used to store events occurring at random times and to service them according to a prescribed discipline that may be fixed or adaptive.

1. A series of outgoing or incoming calls waiting for service.
2. In a store-and-forward switching center, the outgoing messages awaiting transmission at the outgoing line position.

The process of entering elements into or removing elements from a queue.

1. In a switched network, the time between the completion of signaling by the call originator and the arrival of a ringing signal at the call receiver.
Note: Queues may be caused by delays at the originating switch, intermediate switches, or the call receiver servicing switch.
2. In a data network, the sum of the delays between the request for… (Read More →)

The theoretical study of waiting lines, expressed in mathematical terms--including components such as number of waiting lines, number of servers, average wait time, number of queues or lines, and probabilities of queue times' either increasing or decreasing.
Note: Queuing theory is directly applicable to network telecommunications, server queuing, mainframe computer queuing of telecommunications terminals, and advanced telecommunications systems.