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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. <a href="/wiki/Copyright_status_of_works_by_the_federal_government_of_the_United_States" target="_blank">/wiki/Copyright_status_of_works_by_the_federal_government_of_the_United_States</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Steve Winder (9 October 2001). Newnes Telecommunications Pocket Book. Newnes. pp. 83–85. ISBN 978-0-08-049748-8. <a href="978-0-08-049748-8" target="_blank">978-0-08-049748-8</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Steve Winder (9 October 2001). Newnes Telecommunications Pocket Book. Newnes. pp. 83–85. ISBN 978-0-08-049748-8. <a href="978-0-08-049748-8" target="_blank">978-0-08-049748-8</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Steve Winder (9 October 2001). Newnes Telecommunications Pocket Book. Newnes. pp. 83–85. ISBN 978-0-08-049748-8. <a href="978-0-08-049748-8" target="_blank">978-0-08-049748-8</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Becker, Ralph (2006-12-05). "ISDN Tutorial: Interfaces". ralphb.net. Retrieved 2014-01-22. <a href="http://www.ralphb.net/ISDN/ifaces.html" target="_blank">http://www.ralphb.net/ISDN/ifaces.html</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> </ol>