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In telecommunication, the term queuing delay has the following meanings:
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 service and the establishment of a circuit to the called data terminal equipment ( DTE).
3. In a packet-switched network, the sum of the delays encountered by a packet between the time of insertion into the network and the time of delivery to the addressee.
Source: From Federal Standard 1037C and from MIL-STD-188
