3BSE018405R1 TC513AF100  | IC200GBI001 | 数字信号|

3BSE018405R1 TC513AF100调制解调器是是一种能够实现通信所需的调制和解调功能的电子设备。

一般由调制器和解调器组成。在发送端，将计算机串行口产生的数字信号调制成可以通过电话线传输的模拟信号；在接收端，调制解调器把输入计算机的模拟信号转换成相应的数字信号，送入计算机接口。

在个人计算机中，调制解调器常被用来与别的计算机交换数据和程序，以及访问联机信息服务程序等

3BSE018405R1 TC513AF100调制就是用基带脉冲对载波波形某个参数进行控制，形成适合于线路传送的信号。

解调就是当已调制信号到达接收端时，将经过调制器变换过的模拟信号去掉载波恢复成原来的基带数字信号。采用调制解调器也可以把音频信号转换成较高频率的信号和把较高频率的信号转换成音频信号。

所以调制的另一目的是便于线路复用，以便提高线路利用率。

基于载波信号的三个主要参数，可以把调制方式分为三种：调幅、调频和调相。分类方法播报编辑外置式Modem外置式Modem放置于机箱外，通过串行通讯口与主机连接。

这种Modem方便灵巧、易于安装，闪烁的指示灯便于监视Modem的工作状况。但外置式Modem需要使用额外的电源与电缆。

内置式Modem内置式调制解调器(5张)内置式Modem在安装时需要拆开机箱，并且要对终端和COM口进行设置，安装较为繁琐。

这种Modem要占用主板上的扩展槽，但无需额外的电源与电缆，且价格比外置式Modem要便宜一些。

The 3BSE018405R1 TC513AF100 modem is an electronic device capable of achieving the modulation and demodulation functions required for communication. 

It is generally composed of a modulator and a demodulator. At the sending end,

 the digital signal generated by the serial port of the computer is modulated into an analog signal that can be transmitted through the telephone line. 

At the receiving end, the modem converts the analog signal input to the computer into the corresponding digital signal and sends it to the computer interface. 

In personal computers, modems are often used to exchange data and programs with other computers, and to access online information service programs

3BSE018405R1 TC513AF100 modulation is to use baseband pulse to control a certain parameter of the carrier waveform to form a signal suitable for line transmission.

 Demodulation is when the modulated signal reaches the receiving end, the analog signal transformed by the modulator is restored to the original baseband digital signal by removing the carrier. 

The use of modems can also convert audio signals into higher frequency signals and convert higher frequency signals into audio signals. Therefore, another purpose of modulation is to facilitate line multiplexing in order to improve line utilization.

Based on the three main parameters of the carrier signal, the modulation mode can be divided into three types: amplitude modulation, 

frequency modulation and phase modulation. 

Category Method Broadcast Editing External Modem The external Modem is placed outside the chassis and connected to the host through a serial communication port. 

The Modem is convenient and easy to install. The blinking indicator helps to monitor the working status of the Modem. However, 

an external Modem requires additional power supplies and cables. Internal Modem Internal Modem (5 pieces) The internal modem needs to be removed from the chassis and set the terminal and COM port, 

which is complicated to install. This Modem occupies the expansion slot on the motherboard, but does not require additional power supplies and cables, and the price is cheaper than an external Modem.