Abstract
Signalling in the local loop has always been digital in nature. The basic telephone uses signalling at 10 pulses per second, either by using breaks in the d.c. loop of the pairs between the telephone and local exchange, or by sending pulses of multifrequency tone. Similar techniques have also been used between PABXs and the local exchange.
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© 1993 Springer Science+Business Media Dordrecht
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Boulter, R.A. (1993). Digital Signalling in the Local Loop. In: Ritchie, W.K., Stern, J.R. (eds) Telecommunications Local Networks. BT Telecommunications Series, vol 4. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1534-6_13
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DOI: https://doi.org/10.1007/978-94-011-1534-6_13
Publisher Name: Springer, Dordrecht
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