What is Telecommunications: Definition and 28 Discussions

Telecommunication is the transmission of information by various types of technologies over wire, radio, optical or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that feasible with the human voice, but with a similar scale of expediency; thus, slow systems (such as postal mail) are excluded from the field.
The transmission media in telecommunication have evolved through numerous stages of technology, from beacons and other visual signals (such as smoke signals, semaphore telegraphs, signal flags, and optical heliographs), to electrical cable and electromagnetic radiation, including light. Such transmission paths are often divided into communication channels, which afford the advantages of multiplexing multiple concurrent communication sessions. Telecommunication is often used in its plural form, because it involves many different technologies.Other examples of pre-modern long-distance communication included audio messages, such as coded drumbeats, lung-blown horns, and loud whistles. 20th- and 21st-century technologies for long-distance communication usually involve electrical and electromagnetic technologies, such as telegraph, telephone, television and teleprinter, networks, radio, microwave transmission, optical fiber, and communications satellites.
A revolution in wireless communication began in the first decade of the 20th century with the pioneering developments in radio communications by Guglielmo Marconi, who won the Nobel Prize in Physics in 1909, and other notable pioneering inventors and developers in the field of electrical and electronic telecommunications. These included Charles Wheatstone and Samuel Morse (inventors of the telegraph), Antonio Meucci and Alexander Graham Bell (some of the inventors and developers of the telephone, see Invention of the telephone), Edwin Armstrong and Lee de Forest (inventors of radio), as well as Vladimir K. Zworykin, John Logie Baird and Philo Farnsworth (some of the inventors of television).
According to Article 1.3 of the Radio Regulations (RR), telecommunication is defined as « Any transmission, emission or reception of signs, signals, writings, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systems.» This definition is identical to those contained in the Annex to the Constitution and Convention of the International Telecommunication Union (Geneva, 1992).

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  1. O

    Engineering Maximum modulation factor of a two tone signal

    I'm stuck on this because v is a 2 tone signal, so it's not as simple as Am/Ac. The teacher said I will need to differentiate it and equate it to zero, which I thought made sense. Differentiating v gives me: [- mwsin(wt) - mwsin(2w*t)], so there's still unknown variables. I don't know how I'm...
  2. Boltzman Oscillation

    Engineering What jobs should I be seeking with these courses?

    I'm an undergraduate EE student, the last few semesters I have been taking courses in telecommunications. I took an introduction to telecommunications course, a course on data communications, and a course on digital communications. I have not taken a course on wireless communications and will...
  3. E

    Satellite communications project

    Summary:: Looking for a title and an idea to do a research project on the topic of satellite communications Hello fellow FP, I am in desperate need for an idea to do a project, seminar, call it what you like, on the topic of satellite communications for a course. We covered the basics of...
  4. putrinh

    How to solve this to calculate the input impedance?

    How did you find PF?: Google search I got a problem, how to calculate this formula from euler to imajiner? or how calculate this case?
  5. E

    I Holography used in telecommunications

    Hi PF! I am interested to know whether there are applications of holography in telecommunications, and if there is research on this topic. If there is some literature on this topic (provided holography is used in computer networking) where I can read and learn more in-depth about this topic, I...
  6. LLT71

    Efficient Use of Spectrum: The Importance of a Safe Gap Between Channels

    If we have 300kHz bandwidth and every channel uses 100kHz BW, then theoretically we can have total of 3 channels that won't overlap. Why do we need to assign some of the bandwidth for "safe gap" between channels if they "don’t" overlap?
  7. T

    What is the difference between 3G, 4G, and LTE cellular network standards?

    I am very confused with the 3G, 4G, LTE, UTMS, WCDMA terms... Hope someone could shed some light on it. I think complication arises when marketing people start to use these terms interchangeably? Below is my interpretation, is that correct? Would someone be kind enough to make some comments...
  8. M

    Amplitude modulation of signals with [suppressed] carrier

    Hello everybody, I'm a little bit confused about two types of amplitude modulation. We distinguish here: Case I : Amplitude Modulation with suppressed carrier (https://en.wikipedia.org/wiki/Double-sideband_suppressed-carrier_transmission): Case II : Amplitude modulation with carrier: Now...
  9. Tulio Cesar

    B Amplitude Modulation: Unique Frequency & Bandwidth

    1) I am studying modulation of carrier waves, but I still can't understand something: knowing that in AM the carrier wave has only one frequency and just only its amplitudes vary according to variations in modulating signal amplitudes, why AM carrier waves have bandwidth if the frequency is...
  10. Benoit

    How do telecommunications work?

    How telecommunications work? I mean, there are so much waves around us nowadays, how my cellphone recognizes a single signal and rings only when it detects it? If my cellphone is a receipter, why can't I listen to my neighbor converstation, why isn't there a lot of interference and how waves...
  11. Tulio Cesar

    Understanding the Relationship Between Time and Frequency in Modulation?

    1) I understood how variations in the amplitude of modulating signals are represented in the carrier wave, but I didn't get how frequency variations of the modulating signal are represented, as both AM and FM modulations seem do not care about it. Ex: How to distinguish a high vocal range (high...
  12. amilapsn

    Exploring the Relationship Between SNR and Bandwidth Limitations

    Does SNR give a clue to bandwidth limitations? i. e. Would it help to figure out how the signal is distorted due to the limitation of the bandwidth? I think answer is "no" though.
  13. E

    Analogue telecommunications modulations - example

    Here is my task (Basics of analogue telecommunications): Block diagram of device for simultaneous transfer of two telegraphic signals u1(t) and u2(t) is shown on image 1. Both signals have waveform as periodioc signal um(t) on image 2. Frequencies f1 and f2 of carriers $$u_{01}(t)=U_0...
  14. T

    Electronics and telecommunications project

    Halo! I hope to graduate from college of engineering where I study Bachelor of science Electronics and Telecommunications engineering before graduating I required to do a project on my field Help me with a title of which best project I can do. Thank you in advance
  15. Vir27

    Low tech telecommunications (water)

    I'm a historian. I've struck on a curiosity about telecommunication technology in pre-modern times. I've read about a number of methods, and I'd like to ask some physics questions that got beyond my ken. This information is for my curiosity and creativity, not for any rigorous study, so I may be...
  16. Vir27

    Low tech telecommunications (light)

    I'm a historian. I've struck on a curiosity about telecommunication technology in pre-modern times. I've read about a number of methods, and I'd like to ask some physics questions that got beyond my ken. This information is for my curiosity and creativity, not for any rigorous study, so I may be...
  17. Vir27

    Low tech telecommunications (sound)

    I'm a historian. I've struck on a curiosity about telecommunication technology in pre-modern times. I've read about a number of methods, and I'd like to ask some physics questions that got beyond my ken. This information is for my curiosity and creativity, not for any rigorous study, so I may be...
  18. P

    What sparked your interest in mobile sensors and wireless communications?

    Hello, I'm Community Growth Manager at OpenSignal. Studied pure mathematics for my bachelor's degree, but never got around to going deeper with physics. Now that I'm in the mobile sensors, electronics, and wireless communications / telco space, I am extremely interested in everything connected...
  19. C

    Why storms interfere with telecommunications?

    I am not referring to solar winds, just normal adverse atmospheric conditions. Thank you Regards
  20. F

    Eye diagram telecommunications

    Homework Statement draw the eye diagram you would expect to see should a digital signal be passed through a transmission line with a bandwidth limited to three times the maximum bit rate of the digital signal. the answer is "Only f1 and f3 pass through" My question is, what about f2 ? Why...
  21. F

    Telecommunications terminology

    Hello, I have just started reading some telecommunications basic concepts. I have a question regarding the following phrase: "when considering that transmission lines are used in transmitting AC signals: R << ωL G << ωC In high frequency applications the R is so much smaller than the xL...
  22. A

    Designing a Tone Generator for Telecommunications

    I am trying to design a tone generator similar to those used in telecommunications applications (ex: http://www.tessco.com/products/displayProductInfo.do?sku=89724&eventPage=1) The probe (inductive amplifier) can be used on any tone generator, so I plan to use it with mine. So far, I have...
  23. P

    Quantum Mechianics and Telecommunications Engineering?

    Would anyone kindly tell me, in a bit detail, the applications/usefulness of Quantum Mechanics in the field of Telecommunications Engineering? I'd be thankful.
  24. K

    Help Needed Telecommunications Fundamentals Please

    Hi Guys, First off i'd like to say what a site! having found it over the weekend it's given me hope that there may well be hope for me yet. I'm in Ireland and in first year of a BSc in Computer Network Administration, it's a new course and I am a returning mature student, it's about the...
  25. N

    Exploring Telecommunications Management: Questions Answered

    can anyone explain this major for me ( telecommunication managament ) ? thanx in advance
  26. L

    Weather and telecommunications

    Why/how does weather affect telecommunications? The photons in radio waves can pass through matter, such as human bodies and concrete, but they seem to be affected by weather conditions. Why is this, or is my reasoning flawed?
  27. M

    De brolgie and noumenal telecommunications

    our physics teacher said that de broglie waves was widely used to explain a lot of outstanding phenomena like noumenal telecommunications,even i read by applying the quantum mechanics to the brain matter we can explain thinking and thoughts as resonances in our brain even we can explain feelins...