Office classification

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Prior to divestiture, office classification numbers were assigned to offices according to their hierarchical function in the U.S. public switched telephone network.

The following class numbers are used:

  • Class 1: Regional Center (RC)
  • Class 2: Sectional Center (SC)
  • Class 3: Primary Center (PC)
  • Class 4: Toll Center (TC) (Only if operators are present; otherwise Toll Point (TP))
  • Class 5: End Office (EO) [Local central office].

Any one center handles traffic from one center to two or more centers lower in the hierarchy. Since divestiture, these designations have become less firm.

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