Hi Impedance Ethernet tap for IP Recording

最新推荐文章于 2021-11-02 20:09:13 发布

huangkj-henan

最新推荐文章于 2021-11-02 20:09:13 发布

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分类专栏：产品设计过往项目文章标签：设计

本文链接：https://blog.youkuaiyun.com/hnhkj/article/details/50931317

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本文介绍了一种用于IP电话监听的高阻抗以太网探针的设计方案。该方案采用即插即用的形式，通过USB接口与专用驱动程序实现与录音应用的直接通讯。系统组件包括两个脉冲变压器、两个以太网PHY和一个微控制器(MCU)，以实现低成本且易于安装的监听设备。

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Hi Impedance Ethernet tap for IP Recording Design Review

Requirements

The attributes of a successful IP Phone tap are:

Hi Impedance, monitor only (does not interfere or transmit in any
way)
Plug n play, installed and configured in seconds
USB device with dedicated drivers that talk directly to the recorder application.
Does not require secondary Ethernet or complex reference to IP addresses etc. for installation.
Low Cost

Option

System components
2 x Pulse Transformer + 2 x Ethernet PHY + MCU
这里写图片描述
System consideration
In this way, I used two network interface chip processing network things. MCU for network communication and USB communication. So, MCU firmware need to write to for system requirements. This method requires us to write more programs

High-impedance network port implementation. I recommend “Build a Dedicated Hardware Ethernet Sniffer (100FDX)” document. This document gave a detailed implementation methods. I think this method is appropriate.

Implementation
这里写图片描述