In telecommunication, the term call set-up time has the following meanings:
1. The overall length of time required to establish a circuit-switched call between users.
2. For data communication, the overall length of time required to establish a circuit-switched call between terminals; i.e., the Call set-up time time from the initiation of a call request to the beginning of the call message.
Note: Call set-up time is the summation of: (a) call request time--the time from initiation of a calling signal to the delivery to the caller of a proceed-to-select signal; (b) selection time--the time from the delivery of the proceed-to-select signal until all the selection signals have been transmitted; and (c) post selection time--the time from the end of the transmission of the selection signals until the delivery of the call-connected signal to the originating terminal.
Source: from Federal Standard 1037C and from MIL-STD-188
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The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. The design and construction of electronic circuits to solve practical problems is part of the fields of electronic engineering, and the hardware design side of computer engineering. The study of new semiconductor devices and their technology is sometimes considered as a branch of physics.
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