How to even out -Modem

26 July 2011

Said to the front of the way the Internet, then several computer surfing the Internet is how to even go out? If several ways are through the same device implements? In this section we will achieve the hardware to the Internet are described.

(a) of a Modem

“Cat” here “cat” is the nickname “modem (); , of a modem is a modem, is a computer and telephone lines signal conversion between the device and the modulator and modem two parts, modulator computer is digital signal (such as the pieces etc) can be made in the telephone in the voice of the signal transmission device, the receiver, modem again voice signal conversion into computer able to receive digital signals. The role of the demodulation is using simulation signal transmission lines transmission digital signals. Electronic signal points two kinds, one kind is “analog signals”, was a “digital signal”. We use the telephone lines of transmission is analog signals, and transmitted between PC digital signals. Have to when you want to put himself through telephone lines of the computer connected to the Internet, you must use the system modem to “translate” two different signals. Connected to the Internet, when the PC to send information to the Internet, because the transmission line is analog signals, so must want to use a modem to the digital signal “translation” into analog signals can be transmitted to the Internet, and this process is called a “. When the PC to obtain information from the Internet, because from the Internet through telephone lines from information is to signal, so the PC want to read them, still must use a modem this “translation”, a process called “demodulation”. Add up to is “demodulation,” which is a modem the origin of the name.

Through a modem and telephone lines can realize the computer data between the letter, telephone line of analog signals turn digital signals to the computer, the computer simulation of the digital signal turn signals to telephone line. Due to the low frequency signals such as sound, transmission Lenovo U450P battery distance from very near, so need to take it to a high frequency signals loaded on to improve the transmission distance, this is a process of modulation. The high frequency signal as if the train, and the low-frequency signals than is good on the train. Modulation signal demodulation, also on the receiving end of the signal to choose our. This is called demodulation. What we call of a modem is just a modem, it is to accept data telephone line of analog signals turn digital signals to calculating machine, while sending data of computer digital signal turns the analog signals are sent to switch telephone line.

Modems generally divided into the outer type, built-in and PC KaShi 3 kinds. Can connect a telephone line or private network cable, external modem and computer serial interface; Built-in type modem directly interpolated in computer expansion slot; PC laptop computers used the KaShi is directly insert in the standard, in the pcmcia slot. At present a modem to basically have two kinds: built-in and outer type. 1. The built-in

Built-in modems in fact is a piece of the expansion of the computer, insert the card calculation of a machine expansion slot then it can be used, it need not take computer serial port. It is quite simple, the connection to the phone lines on the joint inserting the card “line” socket, card another interface “please”, and telephone connected, at ordinary times unused modems, telephone with a little affected.

2. The outer type

External modems is one on computer external cassette device, it need to take up the computer a serial port, also need to connect the power to work alone, external modems panel have the light a few state indicator light, can be easily you monitor the modem communication condition, and external modems installation and removal, set to buy and maintenance PA3420U-1BRS battery very convenient also, also easy to carry.

External modems connection very convenient also, its advantage is to a row of indicator light, you can directly see networking state, please pick up line and the method with built-in modulation is the same solution. But external modems have to have a root serial cable computer a serial port and modem serial port together, this serial line general with external modems distribution.

Modem is one of important performance parameters is the transmission rates, the present market condition 28.8 K, 33.6 K and a 56 K modem has, and 56 K modem has become the mainstream market products. But as the country’s limits, and communication lines with door too much, too little, because of the international export use at ordinary times it is difficult to reach the above rates, because of this, if you use the transmission rate per second show only a few K and even more low, you also don’t doubt computer or a modem have what problem.

To locate your computer installed in the modem type, please right click Windows desktop computer (I wish the computer) icon in the show, drop-down menu, select the properties (properties), and then click device manager (equipment management tag. In the equipment list double click of a modem (a modem), in the modem (a modem) small under the heading of modem shows that your name.

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