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Queueing Delay
In an automatically switched telephone network, the time period that occurs between the completion of the calling party signaling and the arrival of a ringing signal at the called instrument. Note: It may be due to delays (queues) at the originating switch, any intermediate switches, or the called-party servicing switch.
In a data network, the sum of all the delays introduced by the network between the originator's request for service and the establishment of a circuit to the called data terminal equipment.
In a packet-switched network, the sum of all of the delays encountered by a packet between the time of introduction into the network and the time of delivery to the addressee. See also buffer.