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Communication terminal apparatus

A communication terminal and loop technology, applied in image communication, telephone communication, electrical components, etc., can solve the problems of semiconductor DAA inoperability and communication failure, etc., achieve simple loop structure, send and receive control, and reduce costs

Inactive Publication Date: 2010-10-13
OKI DATA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in conventional communication terminal devices, since the semiconductor DAA is operated by direct current from the loop, it will not There is a problem, but when using a dedicated circuit, or using encryption equipment between circuits, etc., there is no DC current overlap in the circuit, so the semiconductor DAA will not work
Therefore, if a communication terminal device using semiconductor DAA is used in the I / F part connected to the circuit, if it is connected to a circuit without DC current superimposition, such as a dedicated circuit, communication will not be possible.

Method used

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Embodiment approach 1

[0020] figure 2 is a perspective view showing the overall appearance of the communication terminal device according to Embodiment 1 of the present invention, image 3 yes means figure 2 A block diagram of the loop structure.

Embodiment approach 1

[0021] The communication terminal device according to Embodiment 1 is a facsimile device 1 and is connected to a circuit network 85 . A data bus 2 is provided inside the facsimile device 1 . The data bus 2 and the printing part 3 for printing the received image, the reading part 4 for converting the sent original into image data, the liquid crystal (LCD) and the light-emitting diode (LED) which indicate the working condition of the device, etc. The display part 5, the operation part 6, the image memory 7 for storing the image information for sending and receiving, the read-out memory (hereinafter referred to as "ROM") 8 for storing various control programs, which can be read and written at any time The memory (hereinafter referred to as "RAM") 9, the encoding / decoding unit 10, the modem 11, and the control unit 20 are connected. The modem 11 is connected to the loop I / F section 30 that performs data transmission and reception with the loop network 85 side.

[0022] Here, the...

Embodiment approach 2

[0054] The overall structure of the communication terminal device (such as a facsimile device) 1 in Embodiment 2 of the present invention is the same as that in Embodiment 1. image 3 The control unit 20 and the circuit I / F unit 30 shown in the figure are replaced with a control unit 20A and a circuit I / F unit 30A different in function or structure, and other structures are the same as those in the first embodiment.

[0055] In the control unit 20A of the second embodiment, in addition to the DC resistance switching instruction means 21 and the impedance switching instruction means 22 as the control unit 20 of the first embodiment, a selection unit 23 for selecting a circuit type is added. When the operator operates the operation unit 6 to set the circuit type, the set circuit type information is stored in the selection unit 23 , and the selection unit 23 outputs a switching signal S23 based on the stored information.

[0056] Figure 5 means that the second embodiment is i...

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PUM

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Abstract

The present invention provides a simple loop structure and message receiving and transmission for a communication terminal apparatus thereby obtaining low cost of the communication terminal apparatus. DC current is supplied to a semiconductor DAA40 through DC current supplying facility 90 such as a fax device 1 in the communication terminal apparatus. For preventing the leakage of the supplied DC current to the side of the loop network 85, DC current separation facilities 32-1 and 32-2 are provided between the DC current supplying facility 90 and the side of the loop network 85. Thus the communication terminal apparatus using the fax device 1 of semiconductor DAA40, etc. in the loop I / F part 30 can perform communication even when connected with the loop network 85 (such as a private line) without DC current overlapping.

Description

technical field [0001] The present invention relates to a communication terminal device that transmits and receives communication data using a semiconductor DAA (Data Access Arrangement) at a loop interface section (hereinafter referred to as "loop I / F section") connected to a loop network. Background technique [0002] In a conventional communication terminal device, such as a facsimile device described in Patent Document 1 below, communication data has been transmitted and received using a semiconductor DAA in an I / F unit connected to a telephone line. [0003] [Patent Document 1] Japanese Patent Publication No. 2003-298787 [0004] However, in the conventional communication terminal equipment, since the semiconductor DAA operates by using the DC current from the loop, there is no problem when there is a common loop where the DC current overlaps, but when using a dedicated loop or using it between loops When encrypting equipment and so on, there is no DC current overlap i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M11/06H04N1/00
Inventor 中泽一夫
Owner OKI DATA CORP
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