互联网要怎么连接

互联网要怎么连接

　　互联网是由一些使用公用语言互相通信的计算机连接而成的网络，即广域网、局域网及单机按照一定的通讯协议组成的国际计算机网络。接下来小编为大家整理了互联网要怎么连接，希望对你有帮助哦!

　　To connect online， your computer must be equipped with a modem， a device that translates the digital signals from your computer into analog signals that can travel over a standard phone line. Those are the scratchy sounds you hear from a modem's speaker. Believe it or not， there is actually meaning in all that noise. A modem on the other end of the line can understand it and converts the sounds back into digital information.

　　Modems come in different speeds and are measured in bps or bits per second. A 28.8 Kbps modem sends data at 28，800 bits per second. A 56 Kbps modem is twice as fast， sending and receiving data at a rate of 56，000 bits per second. Most modems today are 56 Kbps.

学习啦在线学习网 　　Why does speed matter? On the Internet， you are constantly exchanging data with other computers. Some of these digital files can be quite large. As you will soon learn， you want this exchange to happen as quickly as possible. If you are purchasing a modem， get the fastest one available.

学习啦在线学习网 　　Modems come in different speeds and can be installed inside your computer (internal)， or connected to your computer's serial port (external)。 These days， almost all computers come equipped with an internal modem. But if you need to buy a modem for an older computer， consider purchasing an external one for two reasons. First， they are much easier to install. Second， occasionally your modem will freeze and need to be reset. If your modem is external， you can simply turn it off and on again. If it's internal， the only way to reset it is to turn off your computer and reboot， which can take several minutes every time you need to reset your modem.

　　To connect an external modem to your computer， you'll need a serial modem cable. The cables are usually not included when you buy a modem because there are several different sizes available. These can be purchased at any computer store where modems are sold. Most likely， your computer will have a connector on the back labeled serial， or with the IOIOIO icon. This connector comes in a variety of formats： 9， 15， or 25 pins. If you only have one of these ports， it will probably be COM1. If you have two， one will be COM1， and the other will be COM2. After you plug in your modem， you can sign up for Internet Service.

　　Usually your setup program will try and find your modem and its COM port. If it can't， it will ask you which COM port your modem is attached to. If you don't know， the easiest thing to do is try them all. Even if you only have two serial ports， you may be able to select one of four COM ports. Also， there are some other devices that use the COM ports. In some computers，the mouse is plugged into a serial port. This is known as a serial mouse. If you've got a serial mouse plugged into COM1， then just plug the modem into COM2. If you don't have a second COM port， you can purchase a card that goes inside your computer that will give you a second COM port. If this is necessary， you should check with the manufacturer of your computer.

学习啦在线学习网 　　Your modem will likely have a connector on the back with space for 25 pins. You need to make sure that the serial modem cable you purchase has the right number of pins on either side， and is the correct "gender." The best thing to do is to look at the back of your computer and list the various connectors， the number of pins， and the gender. Then， when you go to purchase your modem， find the cable that matches the connector.

　　Lastly， you'll need a standard phone cable to connect the modem to your phone line. The standard connector on a telephone cable is called an RJ-11. On the back of your modem， you'll probably have two RJ-11 jacks. One is for connecting the modem to a wall jack， and the other is for connecting the modem to a phone. And remember， if you have call waiting， you will want to disable it before connecting online. If you're online and a call comes in， it will disconnect you unless you disable call waiting. In most places you can enter *70 before the number you call for Internet service so that another call will not interrupt you while you're on line.