I'm using a satellite connection right now. Landline internet is very slow (<0.1Mb/s) and very intermittent here. Line attenuation is more than 63dB!
Brian.
I'm using a satellite connection right now. Landline internet is very slow (<0.1Mb/s) and very intermittent here. Line attenuation is more than 63dB!
Brian.
I'm retired now but I was senior engineer with a test equipment manufacturer. Before that I worked on development of the base station network for a major mobile phone manufacturer.what is your job sir?
It refers to how much signal is lost along the wires between the ADSL interface at the telco and the modem at the users premises. The ADSL (broadband) signal is transmitted and received at the telco along the same wires that carry voice but using frequencies above hearing range. As it travels along the wires, some of the signal level is lost and it happens most at the higher frequencies. The data speed depends on the bandwidth available on the line so the modem and telco equipment 'negotiate' the best possible speed for reliable communication based on how well the high frequencies travel between them. A line with poor frequency response will work but at lower speeds. Unfortunately, I am about 4.5Km from the telco so the line is very long here and can not carry the high frequencies needed for a fast connection.please explain this Line attenuation is more than 63dB! in simple word i was not in class lecture when teacher was explaining this.
the base station network for a major mobile phone manufacturer.
It is just as tuning your radio can make it pick up different stations, all the signals are there all the time, you just have to select one out of the crowd.I dont understand a single line i.e. cable can take so many frequency ?
I was responsible for designing testability into the base station electronics, from incoming trunk lines right through to RF at the antenna. They are very complex machines so each individual part has to be tested and verified before the final assembly. My job was to design the testing features so either manual or automatic testing could take place on each section of the station as it was manufactured.
It is just as tuning your radio can make it pick up different stations, all the signals are there all the time, you just have to select one out of the crowd.
In a cable there is a complex waveform which is made up of the addition of lots of smaller waveforms with different amplitude, frequency and phase. Just like the radio, you use filters to separate the individual parts of the waveform. For example, very low frequencies (below about 40Hz) are sent to the phone ringer circuit, audio frequencies are sent to the earpiece and higher frequencies are sent to the data circuits.
That isn't correct, the electrons oscillate at much higher frequencies and at atomic level, it's the current flow that reverses at 50HZ. Left and right mean nothing to electrons!In ac single phase the electron oscillate left and right at 50hz what happen in cables at different frequency so many?
That isn't correct, the electrons oscillate at much higher frequencies and at atomic level
The line attenuation is a number representing how much loss there is in the line. The scale goes from 0dB to 63dB. To get 0dB you would have to connect directly to the telco equipment using very short wires, as you move further away, the attenuation value increases.
https://en.wikipedia.org/wiki/AtomWhy and how electron oscillate at higher frequency?
https://en.wikipedia.org/wiki/Decibelwhat does -dB mean?
Most satellite links are full or half duplex but using the satellite in both directions. There are some systems that use landline for outgoing data and satellite for incoming data, based on the relative speed requirements. In most applications a lot more data is received than transmitted so the equipment may be cheaper if no microwave transmitter is needed.
Brian
I have no idea of the data formats and I doubt very much whether the banks would tell me! The data in both directions is encrypted and might be sent by satellite or landline or both depending on where the machine is located.Then what sort of data does ATM machine recive more than sending?
?As you have satellite internet can can down link the data how you send data to internet?
Is google and yahoo are browser then what is the main name of internet server
Possible but the second co-ax cable may be carrying power to the dish or may be a second download link. Many dishes have two outputs so that two channels or even two satellites can be picked up at once, either to split the data into different paths for security reasons or so one can be a 'fallback' if the other fails. Whether the ATM uses satellite at all or uses it in one direction only is a decision made by the installer and depends on location and if other types of communication are more economical to use.I have noticed that above ATM there is dish with two co-axial wire that may of of one receiving and sending.
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