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Repeat circuit

A relay circuit and relay line technology, which is applied in the direction of electrical components, digital transmission systems, semi-automatic systems, etc., can solve the problems of high cost, many steps, and increased cost of analog relay components

Inactive Publication Date: 2004-06-09
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The first problem is the high cost of analog relay components
Since the analog trunk line has a tendency to decrease year by year, a small amount of production of various analog trunk groups will inevitably lead to an increase in cost
[0012] The second problem is that there are many steps involved in developing the firmware and software that control these analog relay components

Method used

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Examples

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Embodiment Construction

[0062] (A) The overall structure of the communication system

[0063] Fig. 1 schematically shows the overall structure of a relay circuit in which the present invention is incorporated. In Fig. 1, label 1 marks user's telephone set, 2 is electronic switchboard, and 3 is for such as fire-fighting agency switching station, public security agency switching station, fire-fighting or public security agency telephone station and common foreign fire-fighting or public security agency telephone set 2a is the subscriber circuit (SLC), 2b is the main body (NW) of the switch equipped with voice path equipment, central processing unit and input / output equipment. The symbol 2c is labeled LTC (Line Trunk Control) circuit, which is a common control circuit, and performs interface control between the main body of the switch and the analog relay circuit 2d connected to the analog switching station 3 through the trunk lines A and B, The result is the implementation of interface control between...

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PUM

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Abstract

The trunk circuit is connected to an opposite device via lines A, B and configured to attain interface control between an electronic exchange and the opposite device according to respective control sequences of a plurality of kinds. When an external device designates a control sequence to be executed, the trunk circuit sets the polarity of the lines A, B according to the designated control sequence and detects the polarity set by the opposite device through the lines A, B to execute interface control between the electronic exchange and the opposite device.

Description

technical field [0001] The present invention relates to a relay circuit, in particular, to such a relay circuit configured in an electronic exchange. This relay circuit is connected to the counterpart device through the trunk lines A and B, and can B performs interface control between the electronic switchboard and the counterpart device. Background technique [0002] Excellent functionality and quality have always been very important and necessary conditions for receiving orders from switching systems. However, with the increase of users and the increasingly fierce market competition, as far as the entire switching system is concerned, in addition to excellent functions and quality, low cost and easy maintenance have also become important and necessary conditions. [0003] The present invention reduces the types of components PKG constituting a switching system and reduces the cost by integrating those analog trunk modules PKG used as analog trunk line interface equipment ...

Claims

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Application Information

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IPC IPC(8): H04Q3/545H04L12/00H04M3/60H04Q3/42
Inventor 丸山一义小林敏次滨中直人中岛尚之
Owner FUJITSU LTD
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