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Subscriber line interface circuit

A user line interface and circuit technology, applied in the direction of user line interface circuit, telephone communication, electrical components, etc., can solve the problems of increasing the packaging density, increasing the size, and impossible to achieve multiple multiplexing stages.

Inactive Publication Date: 2005-04-13
NEC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] refer to Figure 9 , the first problem is because the analog / digital 112 and digital / analog 113 are set for n channels in the low-voltage LSI 111, if the multiplexing ratio of the codec (codec) function If it is increased, the analog circuit area of ​​the low-voltage LSI 111 will become larger, resulting in difficulty in size reduction
[0013] The second problem is that considering some characteristics, due to the increase of analog circuits, the influence of cross-interference between circuits cannot be ignored
Therefore, it cannot be expected to increase the packing density
So, has been limited to about n = 2 to 4, and the number of multiplexing stages of approximately n = 100 is not possible

Method used

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Embodiment Construction

[0038] Hereinafter, the present invention will be described in detail according to preferred embodiments of the present invention with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough and thorough understanding of the invention. It will be apparent, however, to those skilled in the art that the invention can be practiced without these details. In other instances, well-known structures have not been shown in detail in order to avoid unnecessarily obscuring the present invention.

[0039] figure 1 is a block diagram showing the structure of a preferred embodiment of the subscriber line interface circuit according to the present invention. refer to figure 1 , the subscriber line interface circuit shown is constructed using high voltage LSIs 1-1 to 1-n and a low voltage LSI 111 provided for each circuit. Each of the high-voltage LSIs 1-1 to 1-n is an analog LSI including a power suppl...

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Abstract

A subscriber line interface circuit capable of accommodating multiple circuits (reduced size) and reducing cost. The subscriber line interface circuit includes: a first integrated circuit, a power supply device for providing power to the phone for talking and an analog / digital converter device for converting the analog voice signal output by the phone into a digital signal, the first integrated circuit independent for each channel; and a separate second integrated circuit comprising: a multiplexer for multiplexing digital signals from the analog-to-digital converter means of each first integrated circuit Digital signal processing means for digital signal processing with means and for multiplexing means.

Description

technical field [0001] The present invention relates generally to a subscriber line interface circuit, and more particularly, the present invention relates to a solid state subscriber line interface circuit using a high voltage LSI and a low voltage LSI. Background technique [0002] Figure 9 A structural example of a conventional subscriber line interface circuit is shown. refer to Figure 9 , a subscriber line interface circuit adapted to a number n (n is an integer greater than or equal to 2) of subscribers consists of high-voltage large-scale integrated circuits 101-1 to 101-n corresponding to n channels and a low-voltage large-scale integrated circuit 111 composition. High-voltage LSI is powered by -48V system, such as the voltage of a driving source (power supply, ringing signal, etc.) of a switching device, and is used in some circuits loaded with this voltage. The low-voltage LSI is powered by a +5V system power supply at TTL level, and is used in circuits that pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M3/00H04M19/00H04Q3/42
CPCH04M19/005H04M3/005H04M2201/06
Inventor 须藤实
Owner NEC CORP
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