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Qu'est-ce (qui) est unbalanced account - définition
![Telegraph lines on an [[Oppenheimer pole]] outside the historic Alice Springs telegraph station on the now disused [[Australian Overland Telegraph Line]]](https://commons.wikimedia.org/wiki/Special:FilePath/Alice Springs Telegraph Station 4.jpg?width=200 "Telegraph lines on an [[Oppenheimer pole]] outside the historic Alice Springs telegraph station on the now disused [[Australian Overland Telegraph Line]]")
![Microstrip parallel-coupled transmission lines. The design forms a [[band-pass filter]]](https://commons.wikimedia.org/wiki/Special:FilePath/Microstrip-bandpass-filter.jpg?width=200 "Microstrip parallel-coupled transmission lines. The design forms a [[band-pass filter]]")
![A [[pole-mount transformer]] on a single-wire earth return line in Canada](https://commons.wikimedia.org/wiki/Special:FilePath/Single-phase-pole-transformer-d335.jpg?width=200 "A [[pole-mount transformer]] on a single-wire earth return line in Canada")
![1967 letter by the [[Midland Bank]] to a customer, informing on the introduction of electronic data processing and the introduction of account numbers for current accounts](https://commons.wikimedia.org/wiki/Special:FilePath/1967 Midland Bank letter on electronic data processing.JPG?width=200 "1967 letter by the [[Midland Bank]] to a customer, informing on the introduction of electronic data processing and the introduction of account numbers for current accounts")
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Wikipédia
In telecommunications and electrical engineering in general, an unbalanced line is a pair of conductors intended to carry electrical signals, which have unequal impedances along their lengths and to ground and other circuits. Examples of unbalanced lines are coaxial cable or the historic earth return system invented for the telegraph, but rarely used today. Unbalanced lines are to be contrasted with balanced lines, such as twin-lead or twisted pair which use two identical conductors to maintain impedance balance throughout the line. Balanced and unbalanced lines can be interfaced using a device called a balun.
The chief advantage of the unbalanced line format is cost efficiency. Multiple unbalanced lines can be provided in the same cable with one conductor per line plus a single common return conductor, typically the cable shielding. Likewise, multiple microstrip circuits can all use the same ground plane for the return path. This compares well with balanced cabling which requires two conductors for each line, nearly twice as many. Another benefit of unbalanced lines is that they do not require more expensive, balanced driver and receiver circuits to operate correctly.
Unbalanced lines are sometimes confused with single-ended signalling, but these are entirely separate concepts. The former is a cabling scheme while the latter is a signalling scheme. However, single-ended signalling is commonly sent over unbalanced lines. Unbalanced lines are not to be confused with single-wire transmission lines which do not use a return path at all.
