詳情：
▲ABB 3BSEO21180R1 信號(hào)調(diào)節(jié)板用于插入計(jì)算機(jī)內(nèi)的一個(gè)擴(kuò)展槽使用
調(diào)制解調(diào)器（(即Modem)，是計(jì)算機(jī)與電話線之間進(jìn)行信號(hào)轉(zhuǎn)換的裝置，由調(diào)制器和解調(diào)器兩部分組成，調(diào)制器是把計(jì)算機(jī)的數(shù)字信號(hào)(如文件等)調(diào)制成可在電話線上傳輸?shù)穆曇粜盘?hào)的裝置，在接收端，解調(diào)器再把聲音信號(hào)轉(zhuǎn)換成計(jì)算機(jī)能接收的數(shù)字信號(hào)。通過(guò)調(diào)制解調(diào)器和電話線就可以實(shí)現(xiàn)計(jì)算機(jī)之間的數(shù)據(jù)通信。
目前調(diào)制解調(diào)器主要有兩種:內(nèi)置式和外置式。
內(nèi)置式調(diào)制解聞器其實(shí)就是一塊計(jì)算機(jī)的擴(kuò)展卡，插入計(jì)算機(jī)內(nèi)的一個(gè)擴(kuò)展槽即可使用，它無(wú)需占用計(jì)算機(jī)的審行端口。它的連線相當(dāng)簡(jiǎn)單，把電話線接頭插入卡上的"Line”插口，卡上另一個(gè)接口“Phone”則與電話機(jī)相連，平時(shí)不用調(diào)制解調(diào)器時(shí)，電話機(jī)使用一點(diǎn)也不受影響。
外置式調(diào)制解調(diào)器則是一個(gè)放在計(jì)算機(jī)外部的盒式裝置，它需占用電腦的一個(gè)串行端口，還需要連接單獨(dú)的電源才能工作，外置式調(diào)制解調(diào)器面板上有幾盞伏態(tài)指示燈，可方便您監(jiān)視Modem的通訊狀態(tài)，并且外置式調(diào)制解調(diào)器安裝和拆卸容易，設(shè)置和維修也很方便，還便于攜帶、外置式調(diào)制解調(diào)器的連接也很方便，phonet和line的接法同內(nèi)置式調(diào)制解調(diào)器。但是外雪式調(diào)制解調(diào)器得用一根串行電纜把計(jì)算機(jī)的一個(gè)串行口和調(diào)制解調(diào)器串行口連起來(lái)，這根串行線一般隨外置式調(diào)制解調(diào)器配送。
調(diào)制解調(diào)器的一個(gè)重要性能參數(shù)是傳輸速率，目前市面上28.8K、3.6K和56K的調(diào)制解調(diào)器都有，而且56K的調(diào)制解調(diào)器已經(jīng)成為市場(chǎng)的主流產(chǎn)品。但由于國(guó)內(nèi)通信線洛的限制，以及用戶太多、國(guó)際出口太少的緣故，平時(shí)使用很難達(dá)到上述速率，因此，如果您使用時(shí)傳輸速率顯示只有每秒幾K甚至更低，您也不用懷疑電腦或調(diào)制解調(diào)器有什么問(wèn)題.
▲ABB 3BSEO21180R1 signal regulator board is used to plug into an expansion slot in the computer
Modem (that is, Modem), is a signal conversion device between the computer and the telephone line, composed of two parts of the modulator and the demodulator, the modulator is the computer's digital signal (such as files, etc.) is modulated into a sound signal that can be transmitted on the telephone line, at the receiving end, the demodulator converts the sound signal into a digital signal that the computer can receive. Data communication between computers is possible through modems and telephone lines.
There are two main types of modems: built-in and external.
The built-in modulator is actually a computer expansion card, inserted into an expansion slot in the computer can be used, it does not need to occupy the computer's audit port. Its connection is quite simple, the Phone Line connector is inserted into the "Line "jack on the card, and the other interface on the card" phone "is connected to the telephone, and the use of the telephone is not affected at all when the modem is not used.
The external Modem is a box device placed outside the computer, it needs to occupy a serial port of the computer, but also need to connect a separate power supply to work, the external modem panel has several volt state indicators, which can facilitate you to monitor the communication status of the modem, and the external modem installation and disassembly is easy, setup and maintenance is also very convenient. It is also portable and easy to connect to external modems, phonet and line are connected to built-in modems. However, the external modem uses a serial cable to connect a serial port of the computer to the modem serial port, which is usually shipped with the external modem.
An important performance parameter of the modem is the transmission rate, which is currently available in 28.8K, 3.6K and 56K modems, and 56K modems have become the mainstream products in the market. However, due to the limitation of domestic communication lines, as well as too many users and too few international exports, it is difficult to achieve the above rate in normal use, so if the transmission rate displayed when you use is only a few K per second or even lower, you do not have to doubt what is wrong with the computer or modem.
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