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Portable transceiver and ESN transfer system therefor

  • US 5,535,436 A
  • Filed: 02/13/1995
  • Issued: 07/09/1996
  • Est. Priority Date: 07/25/1990
  • Status: Expired due to Term
First Claim
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1. A portable transceiver comprising:

  • antenna means for converting a radio frequency signal received from a base station of a cellular telephone system into a receive signal and converting a transmit signal to be transmitted to said base station into a radio frequency signal;

    radio frequency signal processing means having a receiving portion for receiving and processing said receive signal, a transmitting portion for generating said transmit signal, and a diplexer connected to said antenna means for separating and combining said receive and transmit signals;

    control and operation means for processing calls and controlling communication to and from said base station by writing a first electronic serial number (ESN), predetermined so as to enable said base station to identify said portable transceiver, into and reading it out of an EEPROM for storing said ESN, and controlling said radio frequency signal processing means; and

    an external connector terminal to be connected to an ESN transfer apparatus so that, when said portable transceiver is a first transceiver to be replaced with a second transceiver on account of trouble occurring in part of said first transceiver and said first ESN is judged correct by said ESN transfer apparatus, said first ESN can be transferred to an EEPROM of said second transceiver without having to physically remove said EEPROM'"'"'s from the respective first and second transceiver;

    wherein said ESN transfer apparatus comprises rewriting means for modifying said first ESN to provide an incorrect version of said first ESN; and

    wherein, after said first ESN is properly transferred to said EEPROM of said second transceiver, said control and operations means of said first transceiver is responsive to said rewriting means to store said incorrect version of said first ESN in said EEPROM of said first transceiver;

    whereby attempts to transfer said incorrect version of said first ESN from said EEPROM of said first transceiver are inhibited by said ESN transfer apparatus.

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