Two-channel 2-4 line user's interface device

Abstract

The two-channel 2-4 line user's interface device includes two completely independent function channels with physically connected earth wire, power wired and ringing current bus and other pins corresponding separate interface circuit separately. Each channel includes user's interface circuit, impedance and mixer network, ring trip detection network and the third stage protective network. The coming analogue two-wire phonetic signal is connected to the user's interface circuit via the third stage protective network, and converted into analogue four-wire signal required by the coder in the user's interface circuit, impendance and mixer network. The control signal from the coder makes output level low, and the ringing current bus outputs ringing current via the ring trip detection network and rings via the user's interface circuit. The present invention can save one-board space and raise circuit performance and reliability.

Description

technical field [0001] The present invention relates to various telecommunication equipments in the communication field, in particular to the user interface device therein. Background technique [0002] Now there are many kinds of user interface circuits on the market, which can be roughly divided into two categories: one is the thick film discrete component solution, which is not suitable for the development needs of flexibility because of its single function, and with the increasing IC price of international companies The continuous downward adjustment will make this kind of solution fade out of the market; the second is the IC solution of major companies. Although this kind of solution occupies the mainstream now, it also has certain difficulties for development engineers. First, there are too many IC manufacturers. It takes a lot of time; the second is that even if you choose a certain IC, you still need to spend a lot of time to build peripheral circuits to make it meet...

AI Technical Summary

Problems solved by technology

[0002] Now there are many kinds of user interface circuits on the market, which can be roughly divided into two categories: one is the thick film discrete component solution, which is not suitable for the development needs of flexibility because of its single function, and with the increasing IC price of international companies The continuous downward adjustment will make this kind of solution fade out of the market; the second is the IC solution of major companies. Although this kind of solution occupies the mainstream now, it also has certain difficulties for development engineers. First, there are too many IC manufacturers. It takes a lot of time; the second is that even if you choose a certain IC, you still need to spend a lot of time to build peripheral circuits to make it meet various technical indicators after cooperating with the codec CODEC; the third is the current integration of single boards. The requirements are getting higher and higher, so the high integration of the user interface circuit occupying the main area of ​​the single board is also highly required. Now the majority of the user interface circuits in the market are single-channel user interface circuits, and the degree of integration needs to be improved; Reliability requirements are getting higher and higher, and high reliability is also conducive to cost reduction

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