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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Annabel Z. Dodd (2002). The Essential Guide to Telecommunications (3rd ed.). Prentice Hall PTR. p. 219. ISBN 0-13-064907-4. <a href="0-13-064907-4" target="_blank">0-13-064907-4</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Sakhawat, Hossen Rakib. Switching and Signaling in Telecommunication Network. ResearchGate. <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Bell System | AT&T, Monopoly, Telecommunication | Britannica". www.britannica.com. Retrieved 2024-02-03. <a href="https://www.britannica.com/topic/Bell-System" target="_blank">https://www.britannica.com/topic/Bell-System</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>