Computer Networking and Management Lesson 1



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Computer Networks and Internet - Overview
Point to Point Access
Computer Networking and Management
Page 21 of 44


Today's modem speeds allow dialup access at rates up to
56 Kbps
. However, due to the poor quality of twisted -pair line between many homes and ISPs, many users get an effective rate significantly less than 56
Kbps. Whereas dialup modems require conversion of the end system's digital data into analogue form for transmission, so-called narrowband
ISDN technology
(Integrated Services Digital Network) allows for all -digital transmission of data from a home end system over ISDN 'telephone' lines to a phone company central office. Although ISDN was originally conceived as away to carry digital data from one end of the phone system to another, it is also an important network access technology that provides higher speed access (for example, 128 Kbps) from the home into a data network such as the Internet. In this case, ISDN can simply bethought of as abetter modem'.

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