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Protocol adaptation

  • US 5,311,590 A
  • Filed: 03/05/1992
  • Issued: 05/10/1994
  • Est. Priority Date: 03/11/1991
  • Status: Expired due to Term
First Claim
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1. Method of operating a telecommunications terminal containing two different data communications protocols for controlling data communication with a digital exchange, the digital exchange operating according to a fixed one of the two different protocols, comprising the following steps:

  • after initializing the telecommunications terminal, activating a first one of the two different data communications protocols;

    sending to the digital exchange a status inquiry indicating the activated first one of the two communications protocols, and starting a timer;

    operating the telecommunications terminal according to the activated first one of the two communications protocols if a status message is received from the digital exchange signaling agreement between the activated first one of the two protocols and the fixed one of the two different protocols; and

    activating the other second one of the two communications protocols and operating the telecommunications terminal according thereto if one of;

    a status message is received from the digital exchange which signals disagreement between the activated first one of the two protocols and the fixed one of the two different protocols, and if the timer has expired without a status message being received;

    wherein, in the status inquiry and the status message, a protocol discriminator forms a first information element indicating the protocol being used, the first information element being evaluated at the digital exchange and at the telecommunications terminal, respectively, to determine agreement or disagreement between protocols.

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