Introduction to Computers Lesson 7B Introduction to Computers

Using Plain Old Telephone System (POTS) for Data Communications A modem translates digital computer signals into analog signals that can travel over standard telephone lines Enlarge Figure

Using Digital Telephone Lines Telephone companies are now installing digital telephone lines, which are dedicated to transmitting data in digital format. Enlarge Figure

Digital Telephone Lines ISDN T1 T3 DSL

Cable Modem Connections Cable modem technology lets home computer users access the Internet through their cable TV lines Enlarge Figure

What to Consider When Choosing a Modem External Modem Internal Modem Transmission Speed Data Compression Error Correction Internal vs. External

Using Modems for File Transfer File transfer: the exchange of files between computers Uploading: sending a file to another computer Downloading: receiving a file from another computer

File Transfer Protocols Kermit Xmodem Ymodem Zmodem MNP

Networking the Home, the Office, and the Globe Lesson 7B Networking the Home, the Office, and the Globe