H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/28
H04Q 3/42 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1250937
- 119 - DIRECTORY NUMBER TRANSLATION IN A DISTRIBUTED CONTROL SWITCHING SYSTEM Abstract A distributed control switching system where the system control units cooperatively perform the terminating port determination function. In particular, the directory number translation function is done in a manner allowing flexibility in assigning directory numbers to switching system ports but minimizing the magnitude of the storage facilities required in each control unit. Each control unit stores the complete directory number translation for certain directory numbers but stores an index referencing other control units for the other directory numbers. Advantageously, the control units referenced are not necessarily the same ones that are associated with the ports defined by those other directory numbers. Thus the call setup sequence frequently involves three control units--the units associated with the originating and terminating ports, and an intermediate unit which stores the directory number translation information for the received directory number. Thus a rigid assignment of a predetermined block of directory numbers to all ports associated with a given control unit is not required.
501154
Chang Shih-Jeh
Emery Richard T.
Hakim Shafik J.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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