In the public switched telephone network (PSTN) hierarchy, a Class 4 office that also serves as a Class 5 office.The separate functions are provided through logical and physical partitioning within the switch. See also Class 4, Class 5, and PSTN.
"Class 4/5." YourDictionary, n.d. Web. 10 November 2018. <https://www.yourdictionary.com/class-4-5>.
Class 4/5. (n.d.). Retrieved November 10th, 2018, from https://www.yourdictionary.com/class-4-5
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