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Signal tone
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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Musical_tone/dL8Bck9W">Musical tone</a></li> <li><a href="/facts/Dual-tone_multi-frequency_signaling/vg5vFo0X">Dual-tone multi-frequency signaling</a> (DTMF)</li> <li><a href="/facts/Signaling_(telecommunications)/6d4zgUj7">Signaling (telecommunications)</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>V. S. Bagad and I. A. Dhotre (2009). Data Communication Systems. Technical Publications. p. 8. ISBN 978-81-8431-698-8. <a href="978-81-8431-698-8" target="_blank">978-81-8431-698-8</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>