• Introduction and Overview of Communication Systems
  www.cs.ucl.ac.uk/staff/S.Bhatti/D51-notes/node1.html#SECTION00010000000000000000
  • Classification of communication networks
  • The variety and description of telecommunications traffic
  • The conversion of analogue and digital signals
  • The transmission of information
  • The relationship between information, bandwidth and noise
  • The description and types of communication channels
  • Digital transmission and switching
  • Standards

• Communication Techniques
  www.cs.ucl.ac.uk/staff/S.Bhatti/D51-notes/node10.html#SECTION00020000000000000000
  • Time, frequency and bandwidth
  • Digital modulation, ASK, FSK and PSK
  • Spread spectrum techniques
  • Digital demodulation, DPSK and MSK
  • Noise in communication systems; probability and random signals
  • Errors in digital communication
  • Timing control in digital communication
  • Design limitations on maximum data-rate and channel capacity
• Communication channels
  www.cs.ucl.ac.uk/staff/S.Bhatti/D51-notes/node19.html#SECTION00030000000000000000
• Information and Coding Theory
  www.cs.ucl.ac.uk/staff/S.Bhatti/D51-notes/node27.html#SECTION00040000000000000000
• Broadband ISDN
  www.cs.ucl.ac.uk/staff/S.Bhatti/D51-notes/node35.html#SECTION00050000000000000000
• Switching
  www.cs.ucl.ac.uk/staff/S.Bhatti/D51-notes/node45.html#SECTION00060000000000000000
• High Speed Networks
  www.cs.ucl.ac.uk/staff/S.Bhatti/D51-notes/node49.html#SECTION00070000000000000000

Links To Other Sites Of Importance In Data Communication:

Introduction to Networking and Data Communications 
www.thelinuxreview.com/howto/intro_to_networking
online book by Eugene Blanchard covering a range of network computing technologies.

RAD Data Communications 
http://www.tdmoip.com
features technology for transporting legacy voice and data over high performance IP networks.

Meetinghouse Data Communications
http://www.mtghouse.com
provides complete network security protocol solutions including wireless LAN security, 802.1X authentication, and 802.1X supplicant.

Dynamite Data Communications, Inc. 
http://www.dynamite.com
develops large database dependent web sites and custom applications.

Data Communications Export Company
http://www.kcnet.com/dceclan/
a vendor of high-quality data and voice communications and connectivity products, including wireless LAN to LAN connectivity and HDSL copper optics products.

Data Communications Corporation
http://www.dcusa.com/
cost effective software implementation and outsourcing.

Enabling High Performance Data Transfers on Hosts
http://www.psc.edu/networking/perf_tune.html

DataMate Global Communications Ltd
http://www.data-mate.com
offering secure corporate instant messaging solutions, including scalable LAN/WAN messaging for the small office to the large enterprise.

SunRiver Data Systems
http://www.sunriver.com
holding company for a strategic group of subsidiaries that offer graphics, text and network terminals, as well as, Intranet and Internet software to businesses.

Maximum Data Throughput on a Phone Line
http://www.users.rcn.com/winske/maxthruput.txt
How much faster can modems go? One person's theory.

Network Computing
http://www.networkcomputing.com
features news, articles, and forums on data management, storage technology, mobile and wireless, IT, infrastructure, network and systems management, security, service providers, and outsourcing.

Broadband Exchange
http://home.btconnect.com/hgi/broad/cable.htm
 - A resource for High Speed Internet users including Cable Modem users.

Books for reference --

Data and Network Communications by Michael A. Miller... 
Data Communications and Computer Networks by Curt M....
Data Communications, Computer Networks and Open Systems 
Handbook of Data Communications and Computer Network..
Data Communications and Computer Networks: A Business U
Book: Data Communications and Computer Networks Curt M. White
Business Communication Networks Data Recovery Book
Data Communications, Networks, and Systems Thomas C. Bartee 
Data Communication and Networks: An Engineering Approach
Data Communications and Computer Networks: A Business User's Approach, Fourth Edition
Wireless Communications & Networks
The Network Nation: Human Communication Via Computer
Business Data Networks and Telecommunications
Data, Network, & Internet Communications Technology
Secure Group Communications Over Data Networks
Security in Fixed and Wireless Networks: An Introduction to Securing Data Communications
Network Security: Data and Voice Communications Author: Fred Simonds Publisher: Computing McGraw-Hill 

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Other Links Of Importance:-

Net For Information