Introduction To Line Telecommunications


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7. Integrated Services Digital Network
  7.1 - Basic Rate ISDN (ISDN 2) / I.420 7.5 - DPNSS Signalling
  7.2 - Primary Rate ISDN (ISDN 30) 7.6 - Q-Sig
  7.3 - DASS Signalling 7.7 - ADSL
7.4 - Euro ISDN (I.421) 7.8 - Cable Modems

7.7 - ADSL

ADSL, or Asymmetric Digital Subscriber Loop, is a data connection not intended for connection to a voice switch. It provides a computer network link to a user's PC via a NIC, Network Interface Card. Facilities are usually included to allow a voice call to be made at the expense of bandwidth.

The primary use for the service will be to provide SOHO and private users permanent access to the Internet by using their current copper pair phone line connection with a device similar to an ISDN Terminal Adapter. This device will also provide a voice connection so that calls can still be made and received over the service.

7.8 - Cable Modems

Cable companies are designing and selling an array of communications and multimedia services including low cost telephone calls and high-speed data services. These are often provided over a co-axial link and decoder or cable modem. They are proprietary and often incompatible with equipment which has not been especially designed to use the service.



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Extracted from

Introduction To Line Telecommunications
Copyright Panasonic Business Systems UK Ltd 2000