:: Networks : Dial-up & ISDN : Dedicated Lines : Future Options ::
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The two main ways to connect to the Internet are dial-up strategies and dedicated lines. New technologies such as satellites and cable modems offer promising future options but are not yet commercially viable. This module covers the dial-up options. Dial-up options rely on local phone lines to connect to the Internet. There are currently two main types of connectivity using phone lines. The first is dial-up modems and the second is a relatively new technology called Integrated Services Digital Network or ISDN. The main differences between the two are speed and transmission technology. ISDN is up to five times faster than modem dial-up, because it transmits data digitally. A future dial-up technology called Asymmetric Digital Subscriber Line (ADSL) promises very high-speed data transfer. Imagine speeds up to 4 Mbps over existing phone lines. However, the technology is still very expensive and immature. ADSL signals travel only a few hundred yards before degrading. Significant improvement will have to be made before ADSL is commercially available.

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