Why does phone line noise affect my connection speed?
It all has to do with how computers understand "data." Everything that your computer does, stores, or displays uses binary data, which is a 1 or a 0. Simply put, a 1 means that electricity is flowing through your computer's processor, and 0 means that there is no electricity flowing through the processor. The switch is on or the switch is off. A modem connection to the Internet has an analog portion that cannot transmit the on and off states of binary data. Analog phone lines have electrical sound signals that your telephone turns into sound waves, which are then sent to your ear where you "hear" what is being said over the telephone. Your computer doesn't understand electrical sound signals. It only understands 1's and 0's. Computers have to modulate the digital signal that computers understand (1's and 0's) into a series of electrical sounds sent over your telephone lines. Your modem then has to Demodulate those electrical sounds on the phone lines back into a digital signal that is understood by your computer. The Modulating and Demodulating is where you get the term Modem. Here's where line noise comes in to play. When data travels along an analog phone line, you can pick up a phone and actually "hear" it with your own ears. Your modem also has to "hear" this data, so any noise on the phone lines can mask the data that your modem wants to hear. In order for your Internet connection to work properly, your modem needs to hear the data perfectly. If it can't hear it very well, it will slow its speed down so it has more time to decode the electrical sounds on the phone line into the digital signal that your computer understands. If the noise on your phone line becomes too bad, your modem can actually disconnect altogether. You could also experience problems getting connected, as your modem and Fujitsu's modems may not be able to hear the handshake properly.
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