Abstract
The idea of separating signaling from the transmission path and allocating a separate path shared with other calls is not new. An early version of the system was investigated by engineers of the, then, Automatic Telephone and Electric Company and the British Post Office.(45) However, suitable components were not available and the work was discontinued. The present-day systems rely on the availability of stored-program techniques and of low-cost electronic components.
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© 1981 Springer Science+Business Media New York
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Pearce, J.G. (1981). Separate-Channel Signaling. In: Telecommunications Switching. Applications of Communications Theory. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2215-1_10
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DOI: https://doi.org/10.1007/978-1-4899-2215-1_10
Publisher Name: Springer, Boston, MA
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