Telecommunication technologies may mostly be divided into wired and wireless methods. Overall though a basic telecommunication system consists of three main parts that are always present in some form or another.

Basic Parts of  Telecommunicating Devices:

A transmitter that takes information and converts it to a signal.
A transmission medium, also called the physical channel that carries the signal. An example of this is the "free space channel".
A receiver that takes the signal from the channel and converts it back into usable information for the receiver.
For example, in a radio broadcasting station the station's large power sound system equipment/increaser is the transmitter; and the broadcasting (device that receives TV and radio signals) is the (connecting point/way of interacting with something) between the power sound system equipment/increaser and the "free space channel". The free space channel is the transmission medium; and the receiver's (device that receives TV and radio signals) is the (connecting point/way of interacting with something) between the free space channel and the receiver. Next, the radio receiver is the destination of the radio signal, and this is where it is converted from electricity to sound for people to listen to.

Duplex:

Sometimes, telecommunication systems are "duplex" (two-way systems) with a single box of electronics working as both the transmitter and a receiver, or a transceiver. For example, a cellular telephone is a transceiver. The transmission electronics and the receiver electronics within a transceiver are actually quite independent of each other. This can be easily explained by the fact that radio transmitters contain power sound system equipment/increasers that operate with electrical powers measured in watts or kilowatts, but radio receivers deal with radio powers that are measured in the microwatts or nanowatts. Because of this, transceivers have to be carefully designed and built to (separate far from others) their high-power circuitry and their low-power circuitry from each other, as to not cause interference.

Point To Point Communication:

Telecommunication over fixed lines is called point-to-point communication because it is between one transmitter and one receiver.

Broadcast Communication:

Telecommunication through radio broadcasts is called broadcast communication because it is between one powerful transmitter and many low-power but sensitive radio receivers.

Multiple Communication (Multiplex) :

Telecommunication (related to sending and receiving phone calls, texts, etc.) in which many transmitters and many receivers have been designed to cooperate and to share the same physical channel are called (movie theater building with many screens) systems. The sharing of physical channels using (movie theater building with many screens) often gives very large reductions in costs. (movie theater building with many screens)ed systems are laid out in telecommunication networks, and the (movie theater building with many screens) signals are switched at nodes through to the correct destination terminal receiver.

Types of Telecommunications:

Communications psignals can be sent either by analog signals or digital signals. There are
  • Analog communication systems
  • Digital communication systems.

Analog Signal:

For an analog signal, the signal is varied continuously with respect to the information. During the spread and reception, the information contained in analog signals will unavoidably be insulted/be reduced in quality by undesirable physical noise. (The output of a transmitter is noise-free for all practical purposes.) Commonly, the noise in a communication system can be expressed as adding or subtracting from the desirable signal in a completely random way. This form of noise is called (serving to add something) noise, with the understanding that the noise can be negative or positive at different instants of time. Noise that is not (serving to add something) noise is a much harder situation to describe or carefully study, and these other kinds of noise will be left out here.

Digital Signal:

On the other hand, unless the (serving to add something) noise disturbance goes beyond a certain (dividing line/point where something begins or changes), the information contained in digital signals will remain unharmed and in one piece. Their resistance to noise represents a key advantage of digital signals over analog signals. In a digital signal, the information is (translated/put into secret code) as a set of separate values (for example, a set of ones and zeros).
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