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Whatis the function of modem?
MOdulate/DEModulate. It converts digital computer signals into analog ones for transmission over analog telephone lines, and then converts the signal back into digital on the other end.
What Following statements accurately describes how a modem works?
A modem (modulator-demodulator) converts digital data from a computer into analog signals for transmission over telephone lines or other communication mediums. It modulates digital signals into analog form for sending and demodulates incoming analog signals back into digital data for the computer. This process enables devices to communicate over various types of networks, such as DSL, cable, or fiber-optic connections. Essentially, the modem serves as a bridge between digital devices and the analog transmission infrastructure.
What devices are used to prepare digital data for transmission over the public switched telephone network?
Devices used to prepare digital data for transmission over the public switched telephone network (PSTN) include modems, which modulate digital signals into analog for transmission and demodulate incoming analog signals back into digital form. Additionally, routers may be employed to manage data traffic and ensure efficient routing over the network. Digital signal processors (DSPs) can also be utilized to optimize signal quality and reduce noise during transmission.
What is the main advantage of digital transmission over analog transmission?
digital signal is less susceptible to signal degradation due to the nature of it's transmission signal which is either on or off and therefore less errors occur as analog is prone to signal degradation and loss that is why digital tv is crisp and clear and analog is somewhat blurry in comparison, also with higher bandwidth achievable by digital transmission more data is able to be transmitted.
What does digital cable mean?
Digital signals permit greater transmission of data over analog signals. The URL http://telecom.hellodirect.com/docs/Tutorials/AnalogVsDigital.1.051501.asp has quite a bit of useful information on the differences between analog and digital broadcasting
What are advantageand disadvantage of analog transmission and analog transmission?
Analog transmission offers advantages such as simplicity and ease of implementation, making it suitable for basic communication systems. It typically requires less bandwidth than digital transmission, allowing for efficient use of available frequencies. However, its disadvantages include susceptibility to noise and distortion, which can degrade signal quality over long distances. Additionally, analog systems lack the error correction capabilities and data compression efficiencies inherent in digital transmission, limiting their overall performance and reliability.
Why digital is cheaer than analog?
Digital is cheaper for two possible reasons. The answer will be determined by your question of type of digital as in physical components or radio based transmissions. Number one: Digital devices can be made smaller with less components than analog. Number two: More information can be transmitted over the same available transmission space using digital than can be with analog.
What are the advantages of a digital radio over an analog radio?
The advantages of digital radio over analog radio are digital radios get more channels than analog, they are clearer in sound and signal and have more additional features.
What is the difference between analog and digital data transmission?
This is essentially the same question as the difference between analog and digital. With analog electronics a voltage is used to represent (or to be an analogy for) some physical attribute in the real world. So for an analog transmission, at its simplest, a sound signal (say) is converted to a voltage, the voltage sent down a cable, then at the other end the voltage converted back into sound with a loudspeaker. With a digital system, the physicial attribute is measured and sent as a series of numbers, the numbers being converted to binary. For a digital transmission, the sound signal is converted to a series of numbers, sent as binary, and converted back to a sound signal at the other end. The advantages of digital is that it makes multiplexing much easier - making it easier to put many signals down the same physical cable. It also makes compressing the signal much easier - this is particularly effective for digital television transmission; 30-40 digital channels can be sent over the same bandwidth as 4 or 5 uncompressed analog channels. Also, digital is much more resiliant against noise - the digital receiver has to make a decision about each bit - is it there or not; noise can be pretty extreme before this becomes impossible, with analog, once noise is added its very difficult to remove it. The historical disadvantage of digital is that digital encoding and decoding equipment was expensive compared with the analog. Over the last 10 years or so, digital electronics has become much cheaper and more powerful.
What Is a Computer modem made of?
A computer modem is made up of various components including a modulator, demodulator, analog-to-digital converter, digital-to-analog converter, signal processor, and a connection interface such as Ethernet or phone line. These components work together to modulate digital data from the computer into analog signals for transmission over a communication medium and then demodulate received analog signals back into digital data for interpretation by the computer.
Why is it necessary to digitize voice signals?
To minimize the distortion of analog signals during transmission Because digital lines transmit signals more efficiently across distances than analog lines Because many telephone networks are moving over to digital interfaces
How are digital aerials different from analog ones?
Digital aerials get a better quality of picture than do analog aerials. in addition, digital aerials can get high definition signals over the air,where analog aerials cannot.
