Class 4/5

Class 4/5 definition - telecom
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.

Webster's New World Telecom Dictionary Copyright © 2008 by Wiley Publishing, Inc., Indianapolis, Indiana.
Used by arrangement with John Wiley & Sons, Inc.

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