Proceed-to-select
In telecommunications, proceed-to-select is a signal or event in the call-access phase of a data call, which signal or event confirms the reception of a call-request signal and advises the calling data terminal equipment to proceed with the transmission of the selection signals.
Examples of proceed-to-select pertain to a dial tone in a telephone system.
References
This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
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