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{{Short description|Interface reference point}}
The '''S interface''' or '''S reference point''', also known as '''S<sub>0</sub>''', is a [[user–network interface]] reference point in an [[Integrated Services Digital Network|ISDN]] [[Basic Rate Interface|BRI]] environment, characterized by a [[four-wire circuit]] using 144{{nbsp}}kbit/s (2 [[Integrated Services Digital Network#Bearer channel|bearer]] and 1 [[Integrated Services Digital Network#Signaling channel|signaling channel]]; 2B+D) user rate.
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Contrast to the [[T interface]], which connects between an NT2 (PBX or other local switching device) and NT1.<ref name=":0" /> However, the S interface is electrically equivalent to the [[T interface]], and the two are jointly referred to as the S/T interface.<ref name="ralphb">{{cite web|last=Becker|first=Ralph|date=2006-12-05|title=ISDN Tutorial: Interfaces|url=http://www.ralphb.net/ISDN/ifaces.html|access-date=2014-01-22|work=ralphb.net}}</ref>
The S interface operates at 4000 48-[[bit]] frames per second; i.e., 192{{nbsp}}kbit/s, with a user portion of 36{{nbsp}}bits per [[frame (telecommunications)|frame]]; i.e., 144{{nbsp}}kbit/s.<ref name="FS1037C">{{FS1037C}}, [http://www.its.bldrdoc.gov/fs-1037/dir-032/_4668.htm Entry "S interface"]</ref>
==See also==
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