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1. COMMUNICATION SYSTEMS
In Telecommunication:-
Communications system or Communication system is a collection of
individual communications networks, transmission systems, relay stat
ions, tributary stations, and data terminal equipment (DTE) usually
capable of interconnection and interoperation to form an integrated
whole.
The components of a communications system serve a common
purpose, are technically compatible, use common procedures,
respond to controls, and operate in union.

2. CON’D…..
Telecommunications is a method of communication.
(e.g. For sports broadcasting,massmedia,journalism, etc.).
Communication is the act of conveying intended meanings
from one entity or group to another through the use of mutually
understood signs and semiotic rules.
A transducer is a device that converts energy from one form to
another

3. Cont’d…

4. Communication System Types
• In ethiotelecom there are three types of communication systems to
transport network.
1. Microwave communication: uses air as communication
medium/media.
2. Fiber communication: uses fiber/fibre as communication
medium/media
3. Satellite Communication Systems.

5. Transmission systems
In telecommunications, a transmission system is a system that
transmits a signal from one place to another. The signal can be
an electrical, optical or radio signal.
Some transmission systems contain multipliers, which amplify a
signal prior to re-transmission, or regenerators, which attempt to
reconstruct and re-shape the coded message before re-transmission.