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Special services add-on for dial pulse activated telephone switching office

  • US 4,232,199 A
  • Filed: 10/18/1978
  • Issued: 11/04/1980
  • Est. Priority Date: 10/18/1978
  • Status: Expired due to Term
First Claim
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1. In a telephone system of the type including a plurality of subscriber subsets connected by a corresponding plurality of subscriber lines to a telephone switching office that includes dial pulse actuated switching equipment, apparatus connectible within the office for augmenting the switching capabilities thereof by enabling the provision of a plurality of special services to subscribers not otherwise providable by the office itself, said apparatus comprising:

  • A. line circuit means associated with each subscriber line to receive a special service, each of said line circuit means includingi. means for sensing circuit status of the subscriber line including signals transmitted from the subscriber subset over the subscriber line to the office, andii. switch means actuated to modify the connection between the subscriber line and the office switching equipment;

    B. buffer storage means for storing subscriber line circuit status and signal information sensed by said line circuit sensing means;

    C. a first bidirectional data bus for transferring information between said buffer storage means and each of said line circuit means;

    D. memory means for storing subscriber identification and class of service information;

    E. processor means responsive to subscriber identification and class of service information stored in said memory means and to subscriber line circuit status and signal information stored in said buffer storage means for recognizing that a special service is to be provided on one of the subscriber lines and for controlling said switch means in the appropriate one of said line circuit means so as to effect the connection modification necessary to provide the special service on that line; and

    F. a second bidirectional data bus for transferring information between said processor means, said memory means and said buffer storage means, said second bus being isolated from said first bus by said buffer storage means.

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