Editing Toll switching trunk

{{Short description|Element of American telephony}}

In [[telecommunications]], a '''toll switching trunk''' or '''toll connecting trunk'''<ref>[http://leegoeller.com/DigFuture/Chap7.htm The Digital Future, 1979] Toll connecting trunk</ref> is a [[Trunk (telecommunications)|trunk]] connecting an [[Class 5 telephone switch|end office]] to a [[Class 4 telephone switch|toll center]] as the first stage of concentration for intertoll or [[long-distance calling|long-distance]] traffic.  

[[Operator assistance]] or participation may be an optional function. In U.S. [[common carrier]] [[telephony]] service, a toll center designated ''Class 4C'' is an office where assistance in completing incoming calls is provided in addition to other traffic; a toll center designated ''Class 4P'' is an office where operators handle only outbound calls, or where [[Telephone exchange|switching]] is performed without [[operator assistance]].<ref>{{cite web|url=http://etler.com/docs/WECo/Fundamentals/files/10-4AToll.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://etler.com/docs/WECo/Fundamentals/files/10-4AToll.pdf |archive-date=2022-10-09 |url-status=live |title=4A Toll Switching System}}</ref>

==References==
{{reflist}}
*{{FS1037C MS188}}

==See also==
* [[Class-4 telephone switch]]

[[Category:Communication circuits]]
[[Category:Telecommunications economics]]


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