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ISDN modem capable of self-configuring to use one of a variety of pre-programmed ISDN protocols

  • US 5,864,559 A
  • Filed: 08/23/1996
  • Issued: 01/26/1999
  • Est. Priority Date: 08/23/1996
  • Status: Expired due to Fees
First Claim
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1. In configuring an ISDN modem to operate with an unknown ISDN switch, a method for identifying the switch type and setting the modem to operate with an ISDN protocol compatible with the switch, comprising the steps of:

  • (a) setting the modem by preprogrammed code to attempt operation with a first ISDN protocol of multiple preprogrammed ISDN protocols by which the modem may be set to operate;

    (b) attempting for a first preset time period to connect to the switch by using the first ISDN protocol;

    (c) selecting the first ISDN protocol for continued use in the event the connection attempt in (b) is successful;

    (d) setting the modem to operate by a second of the multiple ISDN protocols in the event the first preset time passes without a successful connection;

    (e) attempting for a second preset time period to connect to the switch by using the second ISDN protocol;

    (f) selecting the second ISDN protocol for continued use in the event the connection attempt in (e) is successful; and

    (g) continuing to change the protocol to others of the ISDN protocols and to attempt to connect as in steps (a)-(f) until a successful connection is made and the protocol in use at the time of the successful connection is made is selected for continued use, or until all preprogrammed protocols are tested.

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