The first site to check out is MCI's discussion of various aspects of wired communication. Click on networkMCI Developers Lab. Click on the tiles, for example `Our Vision'. Then click on tile `Our Vision' to return. You will see a new tile called 'Analog vs Digital' Keep going because the tile are three layers deep. When you wish to return to the notes, click on 'back' at the top of you netscape browser several times to return to the notes. You might wish to go through AT&T's WORLD OF COMMUNICATION, a storybook on communications. For information on AT&T check out AT&T Home Page. To check out sites for cable television, click on Cable TV sites. For a long list of sites involved in computer networking check here. Remember to click on `back' at the top of your screen to return to the notes.