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Telecommunication 1

The document outlines the course EEE 3117: Communication Engineering - I, covering topics such as telephone apparatus, switching systems, traffic analysis, and modern telephone services. It highlights the evolution of the telephone system, beginning with Alexander Graham Bell's invention in 1876 and the growth of telecommunication giants like AT&T. The course includes key textbooks and emphasizes the principles of telecommunication and the structure of communication networks.

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10 views14 pages

Telecommunication 1

The document outlines the course EEE 3117: Communication Engineering - I, covering topics such as telephone apparatus, switching systems, traffic analysis, and modern telephone services. It highlights the evolution of the telephone system, beginning with Alexander Graham Bell's invention in 1876 and the growth of telecommunication giants like AT&T. The course includes key textbooks and emphasizes the principles of telecommunication and the structure of communication networks.

Uploaded by

heartless9109
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Course No.

EEE 3117 Course Title: Communication Engineering - I

Contact hours/week: 3 Credits:3

Introduction: Principle, evolution, networks, exchange and international


regulatory bodies. Telephone apparatus: Microphone, speakers, ringer,
pulse tone dialing mechanism, side-tone mechanism, local and central
batteries and advanced features. Switching system: Introduction to analog
system, digital switching systems – space division switching, blocking
probability and multistage switching, time division switching and two
dimensional switching.

Traffic analysis: Traffic characterization, grades of service, network


blocking probabilities, delay system and queuing. Modern telephone
services and network: Internet telephony, facsimile, integrated services
digital network, asynchronous transfer mode and intelligent networks.
Text Books:
1. Telecommunication Switching Systems and Networks ----
--Author: Thiagarajan Viswanathan

2. Telecommunications and the computer------- James Martin

3. Digital Telephony -------- John. C. Bellamy

4. Fundamentals of Telecommunications-------- Roger L.


Freeman
• Telecommunication
– A long distance communications
– ‘tele’ Greek word for distant or afar

• Telephone
– One of the most remarkable devices ever invented
• Telephone – ‘tele’ – from afar, phone – sound/
voice

– An apparatus for reproducing sound, especially


that of the human voice (speech) at a great distance
by means of electricity; consisting of transmitting
& receiving instruments connected by a line or
wire which conveys the electric current.
TELEPHONE INSTRUMENTS
& SIGNALS

Copy of the original phone of


Graham Bell
1896 Telephone (Sweden)
http://en.wikipedia.or
g/wiki/Telephone
Rapid Development of Telephone System

• 1876 - Alexander Graham Bell & Thomas A Watson


invented the telephone

• 1877 – there are only 6 telephones in the world

• 1881 – 3,000 telephones

• 1883 – 133,000 (in US)


Telecommunication Giant Evolution

• AT&T –American Telephone & Telegraph


Company
– Referred to as the Bell Telephone System
– In 1982 - $155 billion assets, 1M employees, 100,000
vehicles

• Comparison with Microsoft assets in 1988


– $10 billion

• 1.5 billion telephone sets are operating in the world


today
In Telephone conversation, the one who initiates the
call is referred to as the calling subscriber and the
one for whom the call is destined is the called
subscriber.

In other cases of information transfer, the


communicating entities are known as source and
destination, respectively.
A network with point to point links

The total number of links:

L=(n-1)+(n-2)+…..+1+0=n(n-1)/2.

For 50 subscriber, require 1225 links.

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