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Private branch exchange having a central control unit and a mobile control unit subordinate thereto

  • US 5,544,226 A
  • Filed: 09/11/1995
  • Issued: 08/06/1996
  • Est. Priority Date: 08/30/1991
  • Status: Expired due to Fees
First Claim
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1. A private branch exchange (PABX) comprising:

  • a plurality of interface modules (I/F) configured for connecting a plurality of corded terminals (DE) by wire and for connecting at least one base station (BS) which serves a radio cell (FZ) and is connectable via an air interface to a plurality of cordless terminals (HS);

    a central control unit (PABX CPU) for processing all call handling in the private branch exchange for the plurality of corded terminals (DE), including processing corded terminal call-setup and call-cleardown messages and corded terminal connection orders, and for further processing only a part of the call handling for the plurality of cordless terminals (HS) in response to a mobile control message signal, including processing all cordless terminal connection orders in a same manner as corded terminal connection orders, but not processing cordless terminal call-setup and call-cleardown messages;

    a mobile control unit (mobile CPU) subordinate to the central control unit (PABX CPU) for processing all cordless terminal call-setup and call-cleardown messages for a predetermined set of call numbers assigned to the plurality of cordless terminals (HS), and for providing the mobile control message signal to the central control unit (PABX CPU); and

    a bus system (BUS) to which are connected the central control unit (PABX CPU), the mobile control unit (mobile CPU), and the interface modules (I/F) for exchanging control messages and executing switching tasks.

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