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Programme-controlled switching system user line interface integrating method and circuit

A user line interface and program-controlled switch technology, which is applied in the field of program-controlled switch user line interface integration methods and circuits, can solve problems such as being unfavorable for increasing the density of a single board, a large PCB board area, and an increase in cost, and achieves low power consumption and occupation. The effect of less PCB board area and lower chip cost

Inactive Publication Date: 2004-01-28
HUAWEI TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

For example, TQFP44, with a size of 12mm*12mm, low thermal resistance, many pins, and expensive, PLCC28, with a size of 12.4mm*12.4mm, medium thermal resistance, slightly more expensive, or PDSO20, which is a package with a metal heat sink The special package, 15.9*14.2mm, has extremely low thermal resistance and is very expensive. On the one hand, the cost of the package will increase; density

Method used

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  • Programme-controlled switching system user line interface integrating method and circuit
  • Programme-controlled switching system user line interface integrating method and circuit
  • Programme-controlled switching system user line interface integrating method and circuit

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Embodiment Construction

[0036] Below according to accompanying drawing and embodiment the present invention will be described in further detail:

[0037] refer to figure 1 ,according to figure 2 , image 3 and Figure 4 , the present invention comprises TIP operational amplifier tipDriver, receives the AC signal from voice codec chip CODEC, sampling operational amplifier sampleOPA utilizes sampling resistance R to TIP and RING s1 , R s2Sampling the current of TIP and RING respectively and converting it into voltage, after passing through the DC blocking capacitor, it is sent to the voice codec chip CODEC, which also includes the RING operational amplifier ringDriver, which inverts and amplifies the AC signal output by the TIP operational amplifier tipDriver, and TIP operation The positive terminal of the amplifier tipDriver is connected to an internal DC reference potential VREF, the output terminal of the TIP operational amplifier tipDriver is connected to the negative terminal of the RING oper...

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PUM

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Abstract

TIP drive receives AC signal from voice coding decoding (CODEC) chip. DC referent potential generated interior controls DC of CODEC. AC signal output by TIP drive is reversed and magnified by RING drive. The reversed and magnified output is two wires balanceable differential signal output. DC potential at output end of RING drive is based on the DC potential at output end of TIP drive. The sampling circuit samples TIP and RING. The output signal of the sampling circuit passing through capacitance for isolating DC is sent to CODEC chip. The DC signal output from the sampling circuit through a current limiting circuit is fed back to RING drive. Current limit control of the current limiting circuit makes potential at output end of the RING drive rise. Exterior energy using appliance absorbs raised power. The invention has the advantages of low cost and power consumption as well as high performances.

Description

technical field [0001] The invention relates to telephone communication, in particular to a method and circuit for integrating a subscriber line interface of a program-controlled exchange. Background technique [0002] Such as figure 1 As shown, the basic schematic diagram of the user side of the program-controlled exchange, the user telephone line enters the user line interface circuit through the overcurrent and overvoltage protection device, and the user line interface circuit completes the necessary 2 / 4 line conversion, and then sends it to the voice codec chip Carry out AD, DA conversion and A / u law codec, finally to the digital PCM Highway. [0003] Protection devices, subscriber line interface circuits, voice codec chips and other auxiliary devices complete the seven functions of BORSCHT: [0004] B: Battery Feeding DC feed; [0005] O: Overvoltage Protecting Overcurrent Protecting overvoltage and overcurrent protection; [0006] R: Ring ringing; [0007] S: Supe...

Claims

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Application Information

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IPC IPC(8): H04L12/02
Inventor 孙洪军李波
Owner HUAWEI TECH CO LTD
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