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Modular, portable data processing terminal for use in a communication network

  • US 8,509,260 B2
  • Filed: 02/26/2004
  • Issued: 08/13/2013
  • Est. Priority Date: 08/31/1993
  • Status: Expired due to Fees
First Claim
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1. A system for use in a communication network having a plurality of subnetworks, the system comprising;

  • a mobile computing device comprising;

    a base module comprising a base processing unit operable on data in accordance with a set of communication software routines; and

    a communication module comprising;

    a first communication transceiver comprising a first operating characteristic to conduct data communications on a first of the plurality of subnetworks;

    a second communication transceiver comprising a second operating characteristic to conduct data communications on a second of the plurality of subnetworks, the second operating characteristic being different from the first operating characteristic and the second subnetwork being different from the first subnetwork; and

    a communication processor coupled between the base processing unit and the first and second communication transceivers for converting data received by the first and second communication transceivers to a format for processing by the base processing unit in accordance with the set of communicating software routines and for converting data processed by the base processing unit to a format for transmission by a selected one of the first and second communication transceivers, thereby isolating the base processing unit from differences between the first and second operating characteristics of the first and second communication transceivers,wherein the communication processor is operable to initiate a test communication by the second communication transceiver and respond to the absence of receipt of a reply test communication by the first communication transceiver following initiation of a test communication by the second communication transceiver by conducting data communications with the second communication transceiver.

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