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THE VEST POCKETGUIDE TOINFORMATION TECHNOLOGY 2nd phần 4

Bạn sẽ cần một modem để kết nối máy tính của bạn để đường dây điện thoại. Hầu hết các modem cũng cung cấp khả năng fax. Bạn có thể mua hoặc nội bộ hoặc modem bên ngoài. Không có sự khác biệt trong thực hiện giữa các modem nội bộ và bên ngoài. | Going Online 91 communication software and it is generally free. To access other online services you will need your own communication software. Modem You will need a modem to connect your computer to the telephone line. Most modems also provide faxing capabilities. You can purchase either an internal or an external modem. There is no difference in performance between internal and external modems. Internal modems plug into expansion slots inside your computer this means an internal modem will not occupy any extra space on your desk. Internal modems are also less expensive since they do not require an external case or a separate power supply. The most important consideration in selecting a modem is its speed or baud rate. You should select a modem with a minimum speed of 28 800 bits per second bps . A highspeed modem is compatible with lower-speed modems. A 28 800 bps modem can communicate with a 14 400 bps or a 2 400 bps modem. Other considerations in selecting a modem are available software support reliability minimal errors versatility message buffering call duration logging error correction ability and voice data switching. An intelligent modem can perform many functions more complicated than receiving and transmitting characters over the telephone lines. It allows for dialing answering or hanging up the phone on command redialing last number called and recalling a series of phone numbers. A dumb modem does not possess internal instructions for dialing or hanging up. It does not recognize if it is starting the call or answering it a person usually has to put the modem switch manually to either originate or answer . It has to be instructed on the operating speed. Automatic features are available for different types of modems including o Auto log on Log-on information is provided automatically. o Auto answer Modem is able to get calls and data without the computer operator s intervention. o Auto dial Modem can automatically place a call. o Auto redial This feature