Radio telephone system which writes an identification code via radio link when units are electrically connected

• US 5,097,500 A
• Filed: 01/13/1989
• Issued: 03/17/1992
• Est. Priority Date: 05/15/1987
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Itoh, Koichi
• Primary Examiner(s): Brown, Thomas W.
• Assistant Examiner(s): Bost, Dwayne D.
• Application Number:
  US07/340,091
• Time in Patent Office: 1,159 Days
• Field of Search: 379/58, 379/61, 379/62, 379/63, 465/54
• US Class Current: 455/411
• CPC Class Codes: H04M 1/727 Identification code transfer arrangements

Abstract

A radio telephone system which comprises a base unit (1) connected to a wire line (3) and at least one radio telephone set (2) to be coupled with the base unit (1) through a radio circuit, and in which coupling between the base unit and the radio telephone set is controlled on the basis of an identification code. A non-volatile first memory (58) having an identification previously written therein is provided in one of the base unit (1) and the radio telephone set (2), and an optionally writable second memory (60) is provided in the other. Written in the second memory (60) is a predetermined identification code on the basis of the identification code stored in the first memory (58).

Claims

1. A radio telephone system, comprising:

a base unit connected to a telephone line;

a radio telephone set comprising means for coupling said radio telephone set through a radio link to said base unit;

first nonvolatile memory means disposed in said base unit and having an identification code previously written therein;

second memory means disposed in said radio telephone set to be optionally written therein;

means for electrically connecting said base unit to said radio telephone set;

means for detecting completion of an electrical connection between said base unit and said radio telephone set;

means for writing in said second memory means said identification code previously written in said first memory means through the radio link;

means for starting a writing operation of said writing means in response to a detection output of said detecting means; and

a transmitter in said base unit and means for reducing an output power of said transmitter to a level below a predetermined value when said identification code of said first memory means is written in said second memory means through the radio link.

2. A radio telephone system, comprising:

a base unit connected to a telephone line;

a radio telephone set comprising means for coupling said radio telephone set through a radio link to said base unit;

first memory means disposed in said base unit to be optionally written therein;

second nonvolatile memory means disposed in said radio telephone set and having an identification code previously written therein;

means for writing in said first memory means said identification code previously written in said second nonvolatile memory means, said writing means including

means for electrically connecting said base unit to said radio telephone set,

means for producing a detecting output upon completion of an electrical connection between said base unit and said radio telephone set, and

manual input means operable in response to the presence of said detection output to start writing in said first memory means said identification code previously written in said second nonvolatile memory means; and

a transmitter in said base unit and means for reducing an output power of said transmitter to a level below a predetermined value when said identification code of said first memory means is written in said second memory means through the radio link.