Balanced and Unbalanced definition |
Unbalanced An unbalanced signal has a ground signal which is the common for all other signals and the actual signal voltage is measured in reference to this ground signal. So if there is stated that the voltage for a signal is +12 Vdc for a one and -12 Vdc for a zero, that means that those voltages are measured in reference to the ground signal. The advantage of unbalanced data transmission is when mulitple channels are required, a common ground can be used. The disadvantage of unbalanced data transmission is in its inability to reliably send data in noisy environments due to limited noise margins. NOTE: Normaly the ground signal is said to be 0 Vdc, but it is possible that the line carries a voltage e.g. 220 Vac. What happens is that the signal voltages will then be superimposed on the 220 Vac, so the actual measured voltage at the receiver side is still only the signal voltage. Balanced
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