1. Narindra pustam Nathan Ramessar Tanvir
Group 4 Members .
Narindra pustam
Nathan Ramessar
Tanvir

2. Objective Specific Objective
Explain the meaning of terms related to telecommunication
Content
Transmission media, channels, receivers, senders, modulation, bandwidth; telecommuting

3. What is Telecommunication?
Telecommunications refers to the exchange of information by electronic and electrical means over a significant distance. A complete telecommunication arrangement is made up of two or more stations equipped with transmitter and receiver devices. A single co-arrangement of transmitters and receivers, called a transceiver, may also be used in many telecommunication stations.
Telecommunications devices include telephones, telegraph, radio, microwave communication arrangements, fiber optics, satellites and the Internet.
Telecommunications is also known as telecom.

4. Transmission Media
Transmission media is a pathway that carries the information from sender to receiver. We use different types of cables or waves to transmit data. Data is transmitted normally through electrical or electromagnetic signals.
An electrical signal is in the form of current. An electromagnetic signal is series of electromagnetic energy pulses at various frequencies. These signals can be transmitted through copper wires, optical fibers, atmosphere, water and vacuum. Different Medias have different properties like bandwidth, delay, cost and ease of installation and maintenance. Transmission media is also called Communication channel.

5. The basic difference between guided and unguided media is that in the guided media, the signal travels through a physical medium whereas, in unguided media, the signal travel through the air.

6. GUIDED MEDIA
A twisted pair cable is a type of cable made by putting two separate insulated wires together in a twisted pattern and running them parallel to each other. This type of cable is widely used in different kinds of data and voice infrastructures.
Coaxial cable, is a type of electrical cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield. Many coaxial cables also have an insulating outer sheath or jacket.
An optical fiber cable, also known as a fiber optic cable, is an assembly similar to an electrical cable, but containing one or more optical fibers that are used to carry light. The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube suitable for the environment where the cable will be deployed. Different types of cable[1] are used for different applications, for example long distance telecommunication, or providing a high-speed data connection between different parts of a building

7. UNGUIDED MEDIA
Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have frequencies as high as 300 gigahertz (GHz) to as low as 30 hertz (Hz).[At 300 GHz, the corresponding wavelength  is 1 mm, and at 30 Hz is 10,000 km. Like all other electromagnetic waves, radio waves travel at the speed of light. They are generated by electric charges undergoing acceleration, such as time varying electric currents
Microwaves are a form of electromagnetic radiation with wavelengths  ranging from one meter to one millimeter; with frequencies between 300 MHz (100 cm) and 300 GHz (0.1 cm)
Infrared radiation (IR), sometimes referred to simply as infrared, is a region of the electromagnetic radiation spectrum where wavelengths range from about 700 nanometers (nm) to 1 millimeter (mm).Infrared waves are longer than those of visible light, but shorter than those of radio waves

8. Channels
A communication channel or simply channel refers either to a physical transmission medium such as a wire, or to a logical connection over a multiplexed medium such as a radio channel in telecommunications and computer networking. A channel is used to convey an information signal, for example a digital bit stream, from one or several senders (or transmitters) to one or several receivers. A channel has a certain capacity for transmitting information, often measured by its bandwidth in Hz or its data rate in bits per second.

9. Sender & Receiver
In the telecommunication process, the receiver is the listener, reader, or observer—that is, the individual (or the group of individuals) to whom a message is directed. Another name for receiver is audience or decoder.
The person who initiates a message in the telecommunication process is called the sender. Problems can arise on both ends that prevent the intended message from getting through to the receiver.

10. Problems which may occur from sender to receiver
Messages can calls can be intercepted and eavesdropped on.
Files may be breached/hacked before reaching the receiver, possibly losing sensitive information.
Without good source of networking communication may be difficult due to poor signals.
s, Texts (SMS), generally messages can be misunderstood by the receiver.

11. modulation
modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted. Most radio systems in the 20th century used frequency modulation (FM) or amplitude modulation (AM) to make the carrier carry the radio broadcast.
In general telecommunications, modulation is a process of conveying message signal, for example, a digital bit stream or an analog audio signal, inside another signal that can be physically transmitted. Modulation of a sine waveform transforms a narrow frequency range baseband message signal into a moderate to high frequency range passband signal, one that can pass through a filter.
A modulator is a device that performs modulation. A demodulator (sometimes detector or demod) is a device that performs demodulation, the inverse of modulation. A modem (from modulator–demodulator) can perform both operations.

12. Bandwidth is also the amount of data that can be transmitted in a fixed amount of time. For digital devices, the bandwidth is usually expressed in bits per second(bps) or bytes per second. For analog devices, the bandwidth is expressed in cycles per second, or Hertz (Hz).
Bandwidth

13. Telecommuting (also known as working from home, or e-commuting) is a work arrangement in which the employee works outside the office, often working from home or a location close to home (including coffee shops, libraries, and various other locations).
Rather than traveling to the office, the employee “travels” via telecommunication links, keeping in touch with coworkers and employers via telephone and .
The worker may occasionally enter the office to attend meetings and touch base with the employer. However, with many options for distance conferencing, there may be no need to visit the office.
Telecommuting