using matching U.S. Robotics modems. One catch with the data you upload to the provider is still limited to 33.6kbps or 28.8kbps. There are no set standards for the 56kbps modems as of yet, not all vendors support the same specifications. This means that the Rockwell based modem will not work with the U.S. Robotics modems.ISDN (Integrated Services Digital Network) is a way to move more data over existing telephone lines. ISDN cards are like modems, but are approximately 5 times faster then regular 28.8 modems. It can provide speeds of up to 128,000 bits per second. ISDN has a couple of advantages. It can use the same existing phone line, so the telephone company may not have to install new line. A physical ISDN line provides two 64kbps phone lines called channels that can be used for voice and data. The cost on ISDN is substantial, installation, setup fees and the cost of a special digital adapter. An ISDN line goes through a converter powered by AC current and if the power fails, so does the telephone line.Cable modems offer a very fast connection and are capable of uploading and downloading approximately 10 to 27 megabits per second. A 500k file that would take 1.5 minutes download over ISDN would take about one second using cable. Cable modems use the same coaxial cable that connects televisions. ...
