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Telecommunications

Telecommunications refer to the transmission of information over distances for the purpose of communication. In the modern age of electronics and electricity, telecommunication includes the use of electrical devices, radio and microwave communications, fiber optics, orbiting satellites and the Internet.

2,044 Questions

What is signal modulation?

modulating signal is the message to be carried by the carrier signal.

How many mb's in a oc12?

There are 622 megabytes in an OC12 circuit. These megabytes are transferred per second at that rate. OC12 is a SONET standard product.

Why is carrier recovery required in QAM demodulation?

The answer is simply that QAM is very sensitive to phase error, and a frequency mismatch between the TX and RX radios is equivalent to a constantly increasing phase error. (Remember freq = change phase over change time) An IQ constellation of a QAM signal which has no PLL for carrier recovery will likely look like concentric circles.

In the ideal world, carrier recovery would not be required because the exact frequency used to modulate a signal would be used to demodulate the signal and no phase error would exist. However, in real world communications there are many factors that introduce frequency mismatches. Some examples include doppler frequency shift (resulting from moving objects), Tx or Rx LO frequency offsets, or A/D sampling rate offsets.

What is BSS in telecomnunication?

BSS stands for Base Station Subsystem, and it is the collective name given to Base Station Controller and <a href=:http://blog.ektel.com.np/2011/12/mobile-base-station-transceiverbts-configuration/">Base Stations</a> of a mobile network.

What is the Morse code on cj's apartment?

Morse code on CJ's apartment spells out a message that typically reflects a personal or thematic significance in the context of the story. In the game "Grand Theft Auto: San Andreas," CJ's apartment features Morse code that translates to "The Truth is Out There," hinting at themes of conspiracy and exploration. This clever detail adds depth to the narrative and invites players to engage with the lore.

What is electromechanical switching system?

An Electro-mechanical switch is a type of relay or contactor that opens and closes with an electromagent. Power is applied to the coil or magnet which opens or closes mechanical contact points pre-wired in a configuration suited best for the application. These can be SPST, SPDT, DPDT

Usually in the case of a relay or contactor, the control voltage is a lower voltage AC or in a lot of situations can be DC. Essentially, you are using a small current to switch on/off a larger current, that would be less than optimal, convenient, and in most cases safe otherwise

Imagine you have a 20amp load or higher that you want to turn on or off. You could find a switch to throw on and off or a bus to pull out, but they're not really set up for automation. With a Relay/Contactor of the appropriate amperage rating you could feasibly turn this load on or off reliably, safely and automatically using a much lower current from a number of different sources such as 5VAC, 24VAC, 24VDC, or 120VAC from a switch, sensor, Programmable Logic Controller PLC, or a computer.

How do you reset my atts light on my 98 prelude sh?

You could reset it by going to the fuse box and removeing the clock fuse but make shuts you know the code for the radio also you could try the turning the steering wheel 45 degrees and pull the e brake 2 times within 4seconds and it should blink turn to the right and the left then dead center and then turn the ignition off. See how that goes. There's always draining and refilling with atf fluid.

Who invented the 'princess telephone'?

The Princess telephone was designed by Henry Dreyfuss for the Bell System.

What does near line of sight means?

It means just below the visual horizon. Although light waves can't see below the horizon, radio waves can, a bit.