Wireline PSTN, ISDN, ADSL and
Cable Connections For Remote Access Applications
There are a number of ways of providing remote
access solutions to mobile workers. Here, we are talking of wireline networks,
instead of wireless connections. While you may not have the ubiquity of access that
wireless networks provide, the price is right, coverage for fixed locations is great and
access speeds are much higher..
PSTN - Public Switched Telephone Network
By far, the most popular and universal of remote connectivity
to the Internet. Current speed limit is at 56 Kbps with modems conforming to V.90
Generally available throughout North America in larger
metropolitan areas, it gives you 2B (2 links of 128 Kbps) and one D link at 16 Kbps -
hence the term 2B+D. This service is available under the basic rate of ISDN. This
allows applications, such as videoconferencing to become feasible and
affordable. For more details on ISDN, please refer to chapter 8 of the book
mentioned further on this page.
ADSL is the new high speed method of connection that uses
existing copper wires laid down by the telephone companies. It is available in many
pilot areas in North America, Canada and Europe. While ADSL may not be used for
traditional mobile applications, it does offer an attractive choice for telecommuters and
a primer on ADSL and additional information on ADSL from industry perspective, including
availability of services in your area, go to ADSL Forum web
site www.adsl,com. ADSL Forum maintains a very good site. MOBILEINFO recommends it.
You may also refer to Chapter 8 of "Remote access Networks - PSTN, ISDN, ADSL,
Internet and Wireless", written by Chander Dhawan and published by McGraw-Hill.
Click on www.amazon.com for getting a copy of the
Cable Modem for Remote Access: For
telecommuters and small businesses operating out of residential areas, cable modem is also
an option for remote access to the Internet and to corporate Intranets. Of course, cable
does not give mobility because it is available only in fixed locations.
This topic is described in detail in the
following book " Remote Access Networks - PSTN, ISDN, ADSL, Wireless and
Internet" by Chander Dhawan and published by McGraw-Hill.